IGCSE/GCSE/O & A Level/IB/University Student Forum
Qualification => Subject Doubts => IGCSE/ GCSE => Sciences => Topic started by: mr_scholes on June 04, 2009, 07:58:47 pm
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since 21 hours have past, i'm sure by know everyone on the planet have taken the test
so how was it
By the way what was the mass and the fraction on the energy question
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i got sumthin like 323kg
and i mess read da fraction que but i got 0.77% so i found % instead of fraction
newayz i think its ok
wa was ur first ans???????
i rote micrometer guage!!!!!!!
and i scribbled so much in a que , but ans was clear
is scribbling ok??????
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ya i said micrometer too
i wrote 1750kg or something like that, and the fracton was 1/16
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i did well in physics but wondering.... wats the answer of the diode thing ???
i wrote A
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I dont know mine was Physics 31
and that was easy !!!!!!!!
what about physics 32
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my physics was the second variant or 32 .... it went good...the paper was pure new,but liked it
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I did PHY Variant 32 as well!! anyhowss.. i dont know what most of people were talking about the paper having hidden meanings.. i found it darn straightforward .. excluding I forgot to revise Linear Expanisvity! chek out.. I thought those stuff were basics .. lol .. technically therefore couldn't answer that steel aluminium thing although I did state which was stronger .. but my explanation made no sense or whatseover.. as far I believe .. I guess I lost 7 marks defintely but i bet there are more stuff which i am not aware of .. sighs .. i really do regret for not studying properly. it was an easy scoring paper..
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yah guys in the forum r sayin its tough .... its no tough if u study well and if u concentrated while u were dowin the paper..... u will find it the easiest paper ever in HISTORY
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for da diode i wrote C
hw did u get mass as 1750kg?????
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since 21 hours have past, i'm sure by know everyone on the planet have taken the test
so how was it
By the way what was the mass and the fraction on the energy question
i got 1/8 for the fraction thing....and wat did you get for pressure question when they asked wat the pressure would be if the area was doubled? ....i halved the pressure....and the diode i said D ::)
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I halved the pressure too ! ;p
dnu how i thought about it though :P ..
i thought the paper was easy ..
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in liquid surface area doesnt affect the pressure , only depth and density do.
hmmm since 8 hours are left i dono if other mods will allow discussion now, but i also think every one must have done their exams by now arround the world .
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the paper was easy i got the fraction as 1/8 and the pressure remained same as area has no effect on pressure!!and i wanted to ask about the frist question i wrote g.m tube act. almost everyone wrote gm in my school as the answer how can u say that we had to measure wid a scale???????
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The pressure question was first 540 000
then b)i) was 54000
then c was 3750
then the fraction was 1/8
the electricity question had 0 in the first 2 values and 0.33 A and 0.9 resistance..
the angle of refraction
i wrote was 21 or 22 but im sure its wrong as i forgot to divide refractive index by 1..
and the speed was 2 * 10^8
resultant force = 5600N
and the diode was A..
and i also wrote micrometer..
and choose steel instead of concrete + aluminium..
the force was also 84 N..
and the pressure 0.0 something
wat else is there??
im second varient By the way..
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wahab i m having the same answers az urzz!!!!!!xcept the refraction part got it az 57 or 58 i dont remember!!!can someone plz tell me the answer for the first question and y iz it unwise to close the circuit in parallel ??? ???
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57 was 100% correct my friend!!
im the incorrect one.
i said i forgot to divide refractive index by 1 like u did :-[
but oh well.. 1 mark
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hey wahab can u tell me how did u calculate the mass ? like what method you used ?
and one of my friend mentioned the way of using thread and winding the plastic and such for Q 1 ,, will it be correct ?
what was the answer for the last last Question it had one line with 2 mars
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emi..
you just rearrange the equation to hald of everything u had in a but without the mass.. and make the mass the subject..
it becomes 3750
it was just 1 mark or 2 u dnt need the working for it..
and many people did the winding thing and i dont think its correct cuz they sed they wanted specifically the measurment of only one of the peices..
u cudve used calipers or a micro meter
the last question i wrote from negative to positive (aint sure)
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i did evrythng as u guys dd and in da first q i used da alpha emitter and i said 2 put an alpha emitter and put infront of it a paper and behind it a detector and then i said depending on da no of alpha rays able to penetrate da paper and detected by da detector the thickness can b determined if too many rays pass dat means its very thin if nothing passed that means its very thick....is it right? did any1 do it like me ?
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Why would you divide refractive index by one?? I did
R.I = sin i/sin r ...
1.49 = sin 35 / sin r
and my answer was 23. something
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i wrote the fraction 4/5.......... :(
i didnt take 10% for the 2nd day............o crap!! :-\
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Why would you divide refractive index by one?? I did
R.I = sin i/sin r ...
1.49 = sin 35 / sin r
and my answer was 23. something
Well that's kinda like the thing. I did that first too. and then i realised that the ray that's coming out of the medium A is bending AWAY from the normal :-\
So I decided to switch the fraction. I think you can use 1/refractive index, OR sin r/sin i... i remembered that cuz i saw it in the mark scheme of some old paper
yes and i think it was 57 or something like that... :D
The paper was actually QUITE challenging... :(
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I think i must have lost 10 marks on the question of the kinetic energy. i did loss of potential energy is gain of kinetic energy so instead of using a half mv squared, i used mgh!! someone help am i completely wrong?? i also wrote A for the diode question. Question 1 first variant paper.. who knows the answer..
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who agrees with me tht this ppr was hard......i did the second variant......it was soooo hard....i am gna loose soooooooooooo many marks...and i am the best one in class in physics..i always get full in it...i messed up big time... :'(
i came home and i burst out crying.....i am still so depressed....
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man...i agree wid u....it wz pretty hard....bt some questions were lil easy....so i'll lose less marks...no worries...by da way bakhtawar....wich skool do u study in...???
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i study in saudi arabia in a city called jubail....the school is called jubail international school or al hussan academy....but y r u asking???......yeah the skul has two names...lol but still y r u asking?
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Why would you divide refractive index by one?? I did
R.I = sin i/sin r ...
1.49 = sin 35 / sin r
and my answer was 23. something
U r wrong dude .the answer like 58 or near to it. Ur Eqution is wrong its sinr/ sin35
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i got sumthin like 323kg
and i mess read da fraction que but i got 0.77% so i found % instead of fraction
newayz i think its ok
wa was ur first ans???????
i rote micrometer guage!!!!!!!
and i scribbled so much in a que , but ans was clear
is scribbling ok??????
to find da mass did anyone use mgh=0.5mv2 (25m was given )??????????????//
plzzzzzzz tel me do xaminers mind bout untidy paper???????????????
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no they dont!!! thts the least of our worries.........i am not asking any of my questions...cuz if i do and then if i get the wrong answer i will be even more depressed......
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hey guys i had a few doubts and was hoping any1 could answer them about the phy p3 yesterday-
1)micrometer screw gauge working explanation
2)the milk question especially the last part
3)fraction of the energy question
4)the road forces question-direction of the force.
5)the last question beta particle deflection and the second part.
thx guys.Take care all.
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wahab i m having the same answers az urzz!!!!!!xcept the refraction part got it az 57 or 58 i dont remember!!!can someone plz tell me the answer for the first question and y iz it unwise to close the circuit in parallel ??? ???
because they only require 6v so closing the circuit in parallel would mean that they both get 12V which is way more than what they ned and they'll burst.
can anyone tell me what they got for the damp cloth question...i said that the cloth uses the heat from the milk to evaporate the water on it...and i didnt really explain the evaporation part as there was already a question about it...
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emi..
you just rearrange the equation to hald of everything u had in a but without the mass.. and make the mass the subject..
it becomes 3750
it was just 1 mark or 2 u dnt need the working for it..
and many people did the winding thing and i dont think its correct cuz they sed they wanted specifically the measurment of only one of the peices..
u cudve used calipers or a micro meter
the last question i wrote from negative to positive (aint sure)
i said connect the electric field the other way round so that the +ve is on top and the -ve is on the bottm so that the repulsion of one cancels the attraction of one
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I dont think micrometer is right!
Micrometer is used to measure the diameter of something not the thickness of 6 plastic plates!!!
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they wanted to know the thickness of ONE peice of paper not 6..
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I dont think micrometer is right!
Micrometer is used to measure the diameter of something not the thickness of 6 plastic plates!!!
By the way micrometer is absolutly fine...u just had to mention divide by 10 and my teacher said u couldve used a ruler!!! the formality of the question just confused us all
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but why did they mention 6-plates!
I think both answers in this case would be right! Not sure...
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they specifically asked how to find the thickness of ONE plate..
they wrote the stuff in the beginning just to confuse u!
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anyone had the first variant?
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they specifically asked how to find the thickness of ONE plate..
they wrote the stuff in the beginning just to confuse u!
Yes..that's what i think..lets hope that they accept our answer (i wrote ruler... ;D)
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wasnt it thickness of ten plates?how come u guys r saying 6?!
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wasnt it thickness of ten plates?how come u guys r saying 6?!
Different Variants :D
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anyways what did u write for the bridge rectifier arrows thingy?
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for the first question i wrote vernier caliper!!!iS that right??!works likke micrometer screw gauge?? ??? :( :o
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yeah im sure vernier calliper would be alright..they don't *have to* follow the mark scheme if they think an answer is correct n deserves marks u get them (as given on the front of the mark scheme itself) ---sum1 i knw even wrote radiation...but im not rly sure if they'd award marks for that..
what did u guyz write for how that bottle of milk stays cool cuz it had 2 b strictly in terms of molecules! ???
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guyzz i wrote gm tube as the answer for the first one!!go to this link and see i think that i m rite but i m not sure http://www.s-cool.co.uk/gcse/chemistry/radioactivity/test-its/radioactivity-exam-testit.html but plz dont say that there is chemistry in the link so itz not the answer the question is of physics see question no. 2 :o :o :o
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yea i think they'll giv u marks for that!
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guyzz i wrote gm tube as the answer for the first one!!go to this link and see i think that i m rite but i m not sure http://www.s-cool.co.uk/gcse/chemistry/radioactivity/test-its/radioactivity-exam-testit.html but plz dont say that there is chemistry in the link so itz not the answer the question is of physics see question no. 2 :o :o :o
ghostt if they marked u wrong for ur answer show them this website lool
I guess there are many answers to this question...i think they would consiider all the possibilities!
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guys what about the scale diagram?
i wasted a lot of time on that question because like a retard i forgot that the diagram is to scale... so i started doing cosine rule until i realised that i can measure with the ruler!
and after i discovered that, i forgot to multiply my answer by 5oo N!
stupid vectors
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WEL.....U LOOSE ONLY ONE MARK
I KNEW DA DIRECTION
BUT COUILDNT EXPRESS IT
I WROTE PERPENDICULAR
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no i think for the direction u needed to measure the angle...
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no i think for the direction u needed to measure the angle...
yes that's true!!
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yea i measured the angle but i cant quite remember wat it was.
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anyways ppl im not sure if you agree with me but i found the physics paper3 was much easier than the chemistry!
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anyways ppl im not sure if you agree with me but i found the physics paper3 was much easier than the chemistry!
you r right! it was way easier than chemistry but yet feel made some mistakes!
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YEAH....IT WAS
BUT THEY SAID DIRECTION......................TO THE DIRECTION OF ROAD
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i wrote south east to the road
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thats right!!!
lots of my friends did...
i dont know i forgot abt this word even though i knew it!!!!!!!!
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well a bearing is probably more accurate but i guess they would have several correct answers... so u might be right
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OMAR
WAT did u right 4 the 1st question
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i wrote rule...lol
when i came out of the exam some guys were saying micrometer and tbh i never heard of that before.
but i think if u wrote rule and explained a correct method then u would get marks no doubt ;)
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i wrote da same!!!!!!!!!
i knew others but i didnt knew how to use them!! :o :o :o :o
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I wrote micrometer screw gauge.
The refracted angle is 50 sumthing. All u ppl used the formula R.I.=sin i / sin r, but the thing you didnt realize was that the medium outside was air, so you actually have to substitute the r value.
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I wrote micrometer screw gauge.
The refracted angle is 50 sumthing. All u ppl used the formula R.I.=sin i / sin r, but the thing you didnt realize was that the medium outside was air, so you actually have to substitute the r value.
yeah!!
well that is known as the {{principle of reversebility of light}}
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i wrote a ruller too bcuz i similer question was there in paper 6
where they asked u the hight of the paper n then they ashked height of one
its i guess paper 6 06 :) so i remembered n i wrote it with correct methord :)
ii am not sure for the didode i wrote D :( n the i set the corrent form right to left :S
ad for the force thingi in newton i made a trianle not parellogram :( iam soo depressed:'(
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Why would you divide refractive index by one?? I did
R.I = sin i/sin r ...
1.49 = sin 35 / sin r
and my answer was 23. something
it waz 25...not 35
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Why would you divide refractive index by one?? I did
R.I = sin i/sin r ...
1.49 = sin 35 / sin r
and my answer was 23. something
it waz 25...not 35
i dont know what i worte i have complete forgotten
but i remember it was in 20ss
5alas lets pray the threshold for this paper is loow low lowww!!!:D
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Why would you divide refractive index by one?? I did
R.I = sin i/sin r ...
1.49 = sin 35 / sin r
and my answer was 23. something
it waz 25...not 35
i dont know what i worte i have complete forgotten
but i remember it was in 20ss
5alas lets pray the threshold for this paper is loow low lowww!!!:D
Inshaallah Inshaallah it will be!!
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IT WAS 58.7 THE REFACTED RAY
IT CANNOT BE IN 28
CUZ THE INCIDENT RAY WAS 35
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IT WAS 58.7 THE REFACTED RAY
IT CANNOT BE IN 28
CUZ THE INCIDENT RAY WAS 35
tch i dont remember
ok w8 the critical angle was 90-35 :-\
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CRITICAL ANGLE WAS 42 I CHECKED IT WITH DA PROTRACTOR
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CRITICAL ANGLE WAS 42 I CHECKED IT WITH DA PROTRACTOR
:-\ UGH I HOPE MY PEN HAD A MAGIC INK
which can change all the answer to corect
i really hope the threshold isss doowwwwn
Inshllah InshAllah Inshallah:D
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The fraction question .. I got 1\2! I first wrote it as 1\8 but then I recognized that wind becomes slower when it is heavier.
But that makes sense if the speed is half less then the mass is then more which makes the output half less. [ Blowing slower , less output ]
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guys just by looking at the ray you can see it is bending away the from the normal... its impossible that the answer is in the '20s' it was 58 point something :)
and i think the critical angle was a bit more than 42 because when the incident ray was 42, the refracted ray was a bit less than 90... so i wrote 43 :-\
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i rote 90 cuz whn da incident ray goes in tht way...td c-angle goes 90
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CRITICAL ANGLE.......CAN NEVER BE 90
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guyz wat ws ur anser for the pressur of da pen on da finger and da density of water.
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hey i wrote pressure on finger = force\ area which wre 48 over 0.003 or smth like tht and as for liquid it was Dgh which is 1000 X 10 X 3 i thnk...
Can anyone tell me about the turbine question...was the fraction 1\8??? :-\ did we need to use 25m i th ques?? :-\
And one thing...the brdge rectifying ques..was it C??
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u tell
cuz i forgot
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CRITICAL ANGLE.......CAN NEVER BE 90
lol..nice to know someone wrote the same answers as me...42 and 58.7..:D
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hey i wrote pressure on finger = force\ area which wre 48 over 0.003 or smth like tht and as for liquid it was Dgh which is 1000 X 10 X 3 i thnk...
Can anyone tell me about the turbine question...was the fraction 1\8??? :-\ did we need to use 25m i th ques?? :-\
And one thing...the brdge rectifying ques..was it C??
The Fraction was 1/8....but the rectifying one was A
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hey i wrote pressure on finger = force\ area which wre 48 over 0.003 or smth like tht and as for liquid it was Dgh which is 1000 X 10 X 3 i thnk...
Can anyone tell me about the turbine question...was the fraction 1\8??? :-\ did we need to use 25m i th ques?? :-\
And one thing...the brdge rectifying ques..was it C??
The Fraction was 1/8....but the rectifying one was A
i got the same, 1/8 and A...:D
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I THINK IT WAS C
A" IS IMPOSSIBLE
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Even i thot it was C first but i changed my answer to A cuz even tho it DOES go from the left resistor to right, i think red to black right....it also lets current go from black to red! A was the only one that made sense!
anyway huever chose the wrong diagram but got the arrows for conventional current right still gets 2 marks ECF...the 1st part was only 1 mark so it shud b fine :)
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i cant believe u guyz remember the paper!i already forgot it!!!!!
but i got my fraction as !/2?oh well wats gone is gone!
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AND THE CORRECT FRACTION IS::1/8
WAT DID U GUZS WROTE 4 THE 1 ST QUESTION
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guys just by looking at the ray you can see it is bending away the from the normal... its impossible that the answer is in the '20s' it was 58 point something :)
and i think the critical angle was a bit more than 42 because when the incident ray was 42, the refracted ray was a bit less than 90... so i wrote 43 :-\
same
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AND THE CORRECT FRACTION IS::1/8
WAT DID U GUZS WROTE 4 THE 1 ST QUESTION
i wrote vernier calipers...although i know of a micrometer..dont really know how it works..but i do calipers..so wrote tht..i messed up in the milk and water part..thts the only q im sure busted in, rest was good enough
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I got the fraction 1\2 too!
Because it has a slower speed which means a heavier mass, right?
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i wrote half as well
but i did a huge calculation
i used the kinetic and efficiency formula
wat was the answer to the question b4 it?half the mass?i just divided 7400 by 2
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i used mgh=0.5mv2 to find da mass
and i just wanna no hw u people found ur values of mass?????????
i think 25m was given and we had 2 use it, but most ppl didnt
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AND THE CORRECT FRACTION IS::1/8
WAT DID U GUZS WROTE 4 THE 1 ST QUESTION
i wrote vernier calipers...although i know of a micrometer..dont really know how it works..but i do calipers..so wrote tht..i messed up in the milk and water part..thts the only q im sure busted in, rest was good enough
IF U KNOW how to use calipers than i guarantee u its 110% correct!!!!!!
i knew da word micrometer and this one but i didnt know how to use it!
i am sure u dont live in ksa!!!!
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I got the fraction 1\2 too!
Because it has a slower speed which means a heavier mass, right?
u dont know how glad i am to know i isnt the only one who got half!!!!!!!!!!wohoo
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I got the fraction 1\2 too!
Because it has a slower speed which means a heavier mass, right?
half the speed means half volume of air comes to the turbine, thus, half the original mass..isnt it?
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AND THE CORRECT FRACTION IS::1/8
WAT DID U GUZS WROTE 4 THE 1 ST QUESTION
i wrote vernier calipers...although i know of a micrometer..dont really know how it works..but i do calipers..so wrote tht..i messed up in the milk and water part..thts the only q im sure busted in, rest was good enough
IF U KNOW how to use calipers than i guarantee u its 110% correct!!!!!!
i knew da word micrometer and this one but i didnt know how to use it!
i am sure u dont live in ksa!!!!
i do live in ksa..why? :P
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i used mgh=0.5mv2 to find da mass
and i just wanna no hw u people found ur values of mass?????????
ur idea maybe correct!!!1
but since it was a 1 mark question!!!!
i halved the mass
as the da speed was halved
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i used mgh=0.5mv2 to find da mass
and i just wanna no hw u people found ur values of mass?????????
ur idea maybe correct!!!1
but since it was a 1 mark question!!!!
i halved the mass
as the da speed was halved
i did the same thing!
how much can u do for 1 mark anyways?
oh well lets stay positive and the grade threshold WILL be LOW and we all will get A and A*
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cuz our teachers didnt took us to the lab since 2 years
we didnt see even a burette or any tiny instrument!!!
so how r we suppose to know!!how micrometer works!!!!
and that ke question was simple math u had to take the fraction of the old one to the new one and without unit ;) ;) ;) ;) ;) ;)
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I got the fraction 1\2 too!
Because it has a slower speed which means a heavier mass, right?
half the speed means half volume of air comes to the turbine, thus, half the original mass..isnt it?
I am not actually convinced, it is a slow wind so it will turn the turbines slowly which will generate less electricity thus less power output
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I got the fraction 1\2 too!
Because it has a slower speed which means a heavier mass, right?
half the speed means half volume of air comes to the turbine, thus, half the original mass..isnt it?
I am not actually convinced, it is a slow wind so it will turn the turbines slowly which will generate less electricity thus less power output
thats exactly how it was, less speed, less mass...so 0.5mv2 would have a smaller m, and a smaller v, thus less output..
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I got the fraction 1\2 too!
Because it has a slower speed which means a heavier mass, right?
half the speed means half volume of air comes to the turbine, thus, half the original mass..isnt it?
I am not actually convinced, it is a slow wind so it will turn the turbines slowly which will generate less electricity thus less power output
wat i did was first using the mass of the second air i found its kinetic energy then using that value i found the power output after which i found the fraction.
do u think this was right?
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what did u write abt the fraction
why was the diameter given
i think just to confuse us!!! >:( >:( :o :o :P :P :P :P :P
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what did u write abt the fraction
why was the diameter given
i think just to confuse us!!! >:( >:( :o :o :P :P :P :P :P
their was diameter?!i never saw it!!!!!!!!!!!!!!!!!!!!!!
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what did u write abt the fraction
why was the diameter given
i think just to confuse us!!! >:( >:( :o :o :P :P :P :P :P
their was diameter?!i never saw it!!!!!!!!!!!!!!!!!!!!!!
diameterrr??? WHICH ONEEE?!?!
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what did u write abt the fraction
why was the diameter given
i think just to confuse us!!! >:( >:( :o :o :P :P :P :P :P
their was diameter?!i never saw it!!!!!!!!!!!!!!!!!!!!!!
diameterrr??? WHICH ONEEE?!?!
hey BOOMBASTIC wat r u talkin about?
I NEVER SAW A DIAMETER
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diameter for the ke question 25m...
when ever i see ur username i always by mistake say insanity-CHICKEN!!!!
LOL LOL LOL LOL :P :P :P :P :P :P :P :P
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diameter for the ke question 25m...
when ever i see ur username i always by mistake say insanity-CHICKEN!!!!
LOL LOL LOL LOL :P :P :P :P :P :P :P :P
:P..lol, big difference, i admit im insane..:P
there was 25m, reallly? By the way, diameter of what?
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ya ur rite, it was 25m
and i used it 2 cal. da mass
do u think da fraction que. will have e.c.f ????????
i hope so i dowanna loose 3 marks :'(
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i know even i don't wanna lose 3 marks it can get me from an A to a B to a C!!!!!!!!!!!!!AAAAH
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NO...GUYS DONT WORRY
THE BEST THING IS THAT CIE WANTS ALMOST ALL CANDIDATES TO GET good results!!!
they check the best and the worst performance from all centres and then decide the threshold!!!!
no matter how hard or easy the paper
it all depends on our performance
and as u know the majority WINS!!!!!!!!!!!!! :) ;) ;) ;) :D
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I wrote GM for first que...AHHHHHHHHHHH :(
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really!!!!!!!!!!!!
i know wat wr u thinkn but i dont think that is available in the laboratory and how come a technician has a GM COUNTER AND THE SOURCE
LOL FUNNY ANS AND IT IS NOT EVEN ACCURATE!!!
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ya ur rite, it was 25m
and i used it 2 cal. da mass
do u think da fraction que. will have e.c.f ????????
i hope so i dowanna loose 3 marks :'(
?????????????????
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guys... it was so frkin simple
half the speed means half the mass
fraction was
1/8
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guys... it was so frkin simple
half the speed means half the mass
fraction was
1/8
yeah....but explaining to ppl...was not that simple!!! but of course everyone has their own views!!!lol :o :o :o
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My fraction was 1/8 too. The people who are saying that the Air Goes Slower When Its Heavier are just trying to think too smartly. I tried that in my math exam, and now its a guaranteed mark loss.
I wrote the diode as A. A IS CORRECT. I dont know how ppl got C and D.
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hey guyss
to find the mass in the turbine question, i just used cross multiplication....they had given the mass in the question when the speed was12m/s so therefore:
12m/s 7500kg
6m/s x
ihope this is right...
for the graph question (where u had to show the variation of CURRENT, what did u guys draw??? cuz in my notes the graph for OUTPUT VOLTAGE was only given,,,not CURRENT ???
for the diode i chose B :(
for the milk question, I said that the kinetic energy ofthe milk molecules won't increase enough to allow any molecules to escape as gas, so the coldness od the dampl cloth would prevent the K.E from increasing, thereby keeping the milk bottle cool......I had no other way of explaining in terms of the molecules
I chose Aluminium instead of Steel, because, if you noticed, the expansitivity of concrete and steel were the same, so if u chose steel, when you embed it in the concrete, it won't be able to expan/stretch anymore than the concrete, thereby less strength.....
For the direction of the resultant force, I wrote Right.... :( and for the part where we had 2 mention somethin thts a vector and is not a force, I wrote velocity...
For the first question, I wrote micrometer first, but then since I didn't know how it worked, I wrote a metre rule instead and then explained that first record the measurement with the rule, using a set square (for greater accuracy)for n number of palstic sheets (10 for example) and then divide by 10 to get the thickness for one palstic sheet...
I got 42 for critical angle and for the angle of refraction, I don't know what on earth u guys are talking about dividing by 1 :( ; our teacher never told us any such thing about the reversibility of light :( :( :( Im sad and in my class Im the best one in Physics :( and everyone said the paper was horrible, thanks to our Physics 'teacher' >:( Can you imagine doing Electricity (LEDs, LDRs, thermistors, capacitors, transistors, FRHR, FLHR, effect of current, a.c motor, d.c motor, Logic gates, potential divide, variable resistors) in 3 lessons only, with our Physics 'teacher' NOT knowing the use to transistors in an LDR+pd circuit and her constant blabbering tht she needz to revise her Electricity facts and then explain to us!!! Dude! ur the teacher and we pay u to KNOW ur facts already nd then explain 2 us! >:( :'( :'( :'(
Back to the questions....whatelse...mmmm ohhh yaaaa for the last last question, I said field is perpendicularly out of page and i have a feeling tht it is WRONG
:'(
I really want 2 get A* :-[ :'( :( Inshallah
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FIELD CANNOT BE IN OR OUT OF THE PAGE IT CAN BE UP OR DOWN!!!!
AND I THINK WE HAV THE SAME TEACHER!!!!!!!LOL
CUZ OUR TEACHER DIDNT EVEN DO ALL THIS STUFF!!!
THEY R NOTORIOUSLY ILLEGIBLE......
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When they say "state" something... does it mean we write the value or for example say..
More than 47N?
JUst wondering?
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When they say "state" something... does it mean we write the value or for example say..
More than 47N?
JUst wondering?
wateveevvrrr!! i dont give a damn!!!hehe
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Bani,
I chose Aluminum as well because the metal with higher expansion is placed under the metal to reinforce it. For resultant force I wrote North-east HAHA...
I got C for diode... No idea how.. and I even forgot to tick the correct answers in the last page even though I knew them. I'm pretty sure that I screwed up on some questions.
I only slept four hours before the exam, I couldn't concentrate well.. As a matter of fact my brains were so spoiled that I couldn't calculate the speed of light in the medium, nor Critical angle.
Whenever there was a question with "State" ... I wrote for example... More than 47N LOL!
I really wanted an A* in physics, but I don't think that it's obtainable anymore.. because you'd need at least 90%, but you never know! the system this year changed a loooooot... thus an A*'s percentage has probably changed ::)
Oh well, A* & A has the same credit when you apply to Universities :P
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for state...waz it the que. abt da truck?
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The direction of the resultant was obvious north east but for example "state the Critical Angle" I wrote "more than 35 [degrees]"
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for the diode thing i wrote D !!!! ::)
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i think they wanted the angle of the resultant with reference to the road, as the downward force of 1 car is south...so u hav to write 30 degrees, or whatever u guyz got it may b a lil diff..
and thers no way it could be aluminum! cuz it expands more than concrete so it will cause the concrete to crack!
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i chooose aluminium as the metal, and for the diode, the answere is A, the last question, the electric fiel i wrote it should act downwards to cancel it out. for the direction of the force i wrote diagonal to the road!! i didn't know how else to express it. did any1 get the Piston question 1? Cause on my paper there was nothing like Gm or Micrometer???
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i think they wanted the angle of the resultant with reference to the road, as the downward force of 1 car is south...so u hav to write 30 degrees, or whatever u guyz got it may b a lil diff..
and thers no way it could be aluminum! cuz it expands more than concrete so it will cause the concrete to crack!
That's why it's placed at the bottom of concrete? because its expansion is more... as I know the metal placed below should be the one that has higher expansion.
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the answer iz steel no aluminium cuz aluminium will damage the concrete!!!!!!!cummon itz common sense guyzz!!!!!! :P
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ghostt is absolutely right. the answer is steel.
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hey guys for the water and damp cloth question, is it because water have higher thermal capacity than air so when its hot weather it will not heat up much keeping the milk cool?
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i choosed steel....cause it has the least expansion and as u know in concrete pillars large heat energy is emitted so temperature increase a lot nd therefore we have to get the least expansion so the the concrete pillars wont exxxxxxxplode or crack open... dats wat i think
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hey guys for the water and damp cloth question, is it because water have higher thermal capacity than air so when its hot weather it will not heat up much keeping the milk cool?
nd because water is already poor conductor of heat...so no heat flows in or out..
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am i the only one who actually wrote 30 degrees to direction of road? ???
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hey guys for the water and damp cloth question, is it because water have higher thermal capacity than air so when its hot weather it will not heat up much keeping the milk cool?
nd because water is already poor conductor of heat...so no heat flows in or out..
lolll ok, few marks lost then
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am i the only one who actually wrote 30 degrees to direction of road? ???
i got 29 degrees
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is this correct for the variation of current in da diode thing
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am i the only one who actually wrote 30 degrees to direction of road? ???
i got 29 degrees
i got 11.2 cm, thus 5600 N, you?..later i used cosine rule to just confirm the length, according to that, right answer was 11.19..so im safe there atleast.
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hey guys for the water and damp cloth question, is it because water have higher thermal capacity than air so when its hot weather it will not heat up much keeping the milk cool?
for the diode thing in paper 32 i wrote a
but ppl i did a huge mistake in da kinetic energy thingy i wrote mv2 but i forgot to square da value so i got 45000 alll calculations i did were rytt but bcoz of da first value i got all othr values wrong n da last one i still got 1:2 bcoz u get 1.5 so will i loose complete ten marks ny idea how many marks can i get for da question
pls repllyy
if you got the first kinetic energy value wrong, using the wrong formula, youll lose 3 marks, if you used the wrong value correctly to find 10% and all..you can get those 3 marks..the half mass, was independant of everything...and about the last q you had to find the kinetic energy again..if you used the wrong formula again, youll lose 3 marks too..but if you used the formula right, you might just get those too..
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5600n is correct!!!!!!!!!!!!!!!!!!!!!!!!!!!
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i got 11.2 cm, thus 5600 N, you?..later i used cosine rule to just confirm the length, according to that, right answer was 11.19..so im safe there atleast.
yeh i got tht too
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is this correct for the variation of current in da diode thing
YES its rite
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The pressure question was first 540 000
then b)i) was 54000
then c was 3750
then the fraction was 1/8
the electricity question had 0 in the first 2 values and 0.33 A and 0.9 resistance..
the angle of refraction
i wrote was 21 or 22 but im sure its wrong as i forgot to divide refractive index by 1..
and the speed was 2 * 10^8
resultant force = 5600N
and the diode was A..
and i also wrote micrometer..
and choose steel instead of concrete + aluminium..
the force was also 84 N..
and the pressure 0.0 something
wat else is there??
im second varient By the way..
for the diode thing in paper 32 i wrote a
but ppl i did a huge mistake in da kinetic energy thingy i wrote mv2 but i forgot to square da value so i got 45000 alll calculations i did were rytt but bcoz of da first value i got all othr values wrong n da last one i still got 1:2 bcoz u get 1.5 so will i loose complete ten marks ny idea how many marks can i get for da question
pls repllyy
n ofcourse i wrote gm tube which i think is absolutely wrong bcoz it is used 2 c if the thickness is constant or not not the magnitude off dA thickness i wrote it cuz i didint read da question properly >:(
pls repply
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My fraction was 1/8 too. The people who are saying that the Air Goes Slower When Its Heavier are just trying to think too smartly. I tried that in my math exam, and now its a guaranteed mark loss.
I wrote the diode as A. A IS CORRECT. I dont know how ppl got C and D.
Thank you!!!! i did A too!!!! it btr be correct....thankyou soo much!!!
+rep for u!!
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esso i did the same thing but i dont wether it is correct or nott :D :P
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My fraction was 1/8 too. The people who are saying that the Air Goes Slower When Its Heavier are just trying to think too smartly. I tried that in my math exam, and now its a guaranteed mark loss.
I wrote the diode as A. A IS CORRECT. I dont know how ppl got C and D.
Thank you!!!! i did A too!!!! it btr be correct....thankyou soo much!!!
+rep for u!!
1/8 is the correct answer but i screwed up in thid question i 4got to take 10% in the 2nd tyme!!! :'(
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hey guys for the water and damp cloth question, is it because water have higher thermal capacity than air so when its hot weather it will not heat up much keeping the milk cool?
for the diode thing in paper 32 i wrote a
but ppl i did a huge mistake in da kinetic energy thingy i wrote mv2 but i forgot to square da value so i got 45000 alll calculations i did were rytt but bcoz of da first value i got all othr values wrong n da last one i still got 1:2 bcoz u get 1.5 so will i loose complete ten marks ny idea how many marks can i get for da question
pls repllyy
if you got the first kinetic energy value wrong, using the wrong formula, youll lose 3 marks, if you used the wrong value correctly to find 10% and all..you can get those 3 marks..the half mass, was independant of everything...and about the last q you had to find the kinetic energy again..if you used the wrong formula again, youll lose 3 marks too..but if you used the formula right, you might just get those too..
i wrote everything correct i jus didnt square it in ma calculator so all da values are affected
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is this correct for the variation of current in da diode thing
YES its rite
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guys i wrote A for the diode thing.... is it right ????
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dont know *****
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hey guys for the water and damp cloth question, is it because water have higher thermal capacity than air so when its hot weather it will not heat up much keeping the milk cool?
for the diode thing in paper 32 i wrote a
but ppl i did a huge mistake in da kinetic energy thingy i wrote mv2 but i forgot to square da value so i got 45000 alll calculations i did were rytt but bcoz of da first value i got all othr values wrong n da last one i still got 1:2 bcoz u get 1.5 so will i loose complete ten marks ny idea how many marks can i get for da question
pls repllyy
if you got the first kinetic energy value wrong, using the wrong formula, youll lose 3 marks, if you used the wrong value correctly to find 10% and all..you can get those 3 marks..the half mass, was independant of everything...and about the last q you had to find the kinetic energy again..if you used the wrong formula again, youll lose 3 marks too..but if you used the formula right, you might just get those too..
i wrote everything correct i jus didnt square it in ma calculator so all da values are affected
dont worry u will be penalized onlyonce if u have shown da working and ur method is correct!!!
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hey guys for the water and damp cloth question, is it because water have higher thermal capacity than air so when its hot weather it will not heat up much keeping the milk cool?
for the diode thing in paper 32 i wrote a
but ppl i did a huge mistake in da kinetic energy thingy i wrote mv2 but i forgot to square da value so i got 45000 alll calculations i did were rytt but bcoz of da first value i got all othr values wrong n da last one i still got 1:2 bcoz u get 1.5 so will i loose complete ten marks ny idea how many marks can i get for da question
pls repllyy
if you got the first kinetic energy value wrong, using the wrong formula, youll lose 3 marks, if you used the wrong value correctly to find 10% and all..you can get those 3 marks..the half mass, was independant of everything...and about the last q you had to find the kinetic energy again..if you used the wrong formula again, youll lose 3 marks too..but if you used the formula right, you might just get those too..
i wrote everything correct i jus didnt square it in ma calculator so all da values are affected
dont worry u will be penalized onlyonce if u have shown da working and ur method is correct!!!
r u serius oh my god im so happy
nywayz wht did u get 4 da diode thingy i got b
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madee92
they will cut marks for the formula only and the first answer u did wrong..
if u continue with that wrong value and did the working nd everything correct u will get the rest of da marks...
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i am 99% sure the diode was c
and madee yes because its an ERROR CARRIED FORWARD!!!!
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hey guys about the parachte thing ... when did he open the parachute .... i wrote B
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i am 99% sure the diode was c
and madee yes because its an ERROR CARRIED FORWARD!!!!
wat makes u to sure ????
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hey guys about the parachte thing ... when did he open the parachute .... i wrote B
same here n tht is why da speed drops
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i am not posting any of my answers....incase they are wrong...cuz tht will make me more depressed....i sucked in this paper.....i got the diode thing as A too tho....i got most of my answers like u guys except for tht fraction and the mass of air half of first question and the rest i am not sure lol.....anyways if the thresholds arnt low then i am drowning myslef.......and the direction is 300 By the way.....hope u guys did well and the threshold are reallly low......and yeah the parachute opened at B....the diode has to be A ...plz let it be A...plz God....lol...
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OF COURSE B
THAT CAME 4RM THE PAST PAPERS
AND MANY QUSTIONS CAME 4RM MY BOOK EXACTLY AND PAST PAPERS
I WAS UNDOUBTLY SURPRISED
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i am 99% sure the diode was c
and madee yes because its an ERROR CARRIED FORWARD!!!!
wat makes u to sure ????
yep even i wanna noe
By the way im second variant
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hey guys about the parachte thing ... when did he open the parachute .... i wrote B
same here n tht is why da speed drops
exactly
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i am 99% sure the diode was c
and madee yes because its an ERROR CARRIED FORWARD!!!!
wat makes u to sure ????
CUZ I KNOW HOW A BRIDGE RECTIFIER WORKS~!!!!!! ;D ;D ;D ;D ;D
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OF COURSE B
THAT CAME 4RM THE PAST PAPERS
AND MANY QUSTIONS CAME 4RM MY BOOK EXACTLY AND PAST PAPERS
I WAS UNDOUBTLY SURPRISED
was it a repeated question
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i am 99% sure the diode was c
and madee yes because its an ERROR CARRIED FORWARD!!!!
wat makes u to sure ????
CUZ I KNOW HOW A BRIDGE RECTIFIER WORKS~!!!!!! ;D ;D ;D ;D ;D
ha ha gud joke dude but still i mean vry few ppl wrote c
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wat r u guys doin for paper 1 physics nd chemistry... im so worried abt chemistry dint do well... hope paper 1 is fine...
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THE VECTOR ONE AND THE BOTTLE AND CLOTH
LSO PARACHUTE THE CONCEPT
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i am 99% sure the diode was c
and madee yes because its an ERROR CARRIED FORWARD!!!!
wat makes u to sure ????
JOKE????
R U JEALOUS...OR WAT>>>>
CUZ I KNOW HOW A BRIDGE RECTIFIER WORKS~!!!!!! ;D ;D ;D ;D ;D
ha ha gud joke dude but still i mean vry few ppl wrote c
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dus any1 remember da Al & steel que were of how many marks??????
and wich was da denser medium??????????
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THE VECTOR ONE AND THE BOTTLE AND CLOTH
LSO PARACHUTE THE CONCEPT
So whats the answer for bottle and cloth?
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i am 99% sure the diode was c
and madee yes because its an ERROR CARRIED FORWARD!!!!
wat makes u to sure ????
JOKE????
R U JEALOUS...OR WAT>>>>
CUZ I KNOW HOW A BRIDGE RECTIFIER WORKS~!!!!!! ;D ;D ;D ;D ;D
ha ha gud joke dude but still i mean vry few ppl wrote c
hey im not jealous alryt i was jus asking u a question
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dus any1 remember da Al & steel que were of how many marks??????
and wich was da denser medium??????????
I put the medium A, because the ray goes AWAY FROM THE NORMAL when it passess from more dense to less dense(from medium A to air)
I hope its right :-\
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4 dat i rote that air & water r insulators, so dey prevent convection and conduction .
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dus any1 remember da Al & steel que were of how many marks??????
and wich was da denser medium??????????
I put the medium A, because the ray goes AWAY FROM THE NORMAL when it passess from more dense to less dense(from medium A to air)
I hope its right :-\
yep even i wrote da same
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the expansion thing is 3-4 mrks
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dus any1 remember da Al & steel que were of how many marks??????
3 mrks
what IS the right answer??? cuz some say its Aluminium and some say its Steel :-\
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dus any1 remember da Al & steel que were of how many marks??????
and wich was da denser medium??????????
I put the medium A, because the ray goes AWAY FROM THE NORMAL when it passess from more dense to less dense(from medium A to air)
I hope its right :-\
yep even i wrote da same
Alhamdulillah!!!!! I feel good :)
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critical angle was 42 right ???
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how mch do you think for overall grade ? if paper 1 + 3 + 6 = total 65%, can we get an A ?
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critical angle was 42 right ???
yes. what did u guys write for the current when the resistors were put in parallel?
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critical angle was 42 right ???
YES!!! ;D :D I got the same answer!!
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the refracted ray wasnt 90 degrees so it cant be 42 and has to be slightly more at 43
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since 21 hours have past, i'm sure by know everyone on the planet have taken the test
so how was it
By the way what was the mass and the fraction on the energy question
i got 1/8 for the fraction thing....and wat did you get for pressure question when they asked wat the pressure would be if the area was doubled? ....i halved the pressure....and the diode i said D ::)
yeah i think i put D for the diode thing, but apparently it's wrong...idk! :-\
oohh...for the pressure thing, they said the area was doubled, but the depth was the same yeah...so the pressure should be double too, i guess, odds are i may be wrong! :P
the fraction is 1/8 but i didnt get it... >:(
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the pressure thing is a law- look at pascal's vases. Pressure in a liquid is not affected of the base changes. - do you see A area in the formula pgh ;)
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the pressure thing is a law- look at pascal's vases. Pressure in a liquid is not affected of the base changes. - do you see A area in the formula pgh ;)
wait, so in the end, what was your answer??
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what did you guys get for the voltage at S when it is open and at the voltmeter when S is open? ???
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what did you guys get for the voltage at S when it is open and at the voltmeter when S is open? ???
zero i think :-/
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what did you guys get for the voltage at S when it is open and at the voltmeter when S is open? ???
zero i think :-/
both? I though one would be 12
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the pressure thing is a law- look at pascal's vases. Pressure in a liquid is not affected of the base changes. - do you see A area in the formula pgh ;)
wait, so in the end, what was your answer??
the same as the previous 3xxxxxxx something
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what did you guys get for the voltage at S when it is open and at the voltmeter when S is open? ???
i wrote 12 but later i found dat the ans is 0
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what did you guys get for the voltage at S when it is open and at the voltmeter when S is open? ???
i wrote 12 but later i found dat the ans is 0
there where two questions. Which did you say is O?
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what did you guys get for the voltage at S when it is open and at the voltmeter when S is open? ???
i wrote 12 but later i found dat the ans is 0
there where two questions. Which did you say is O?
the place where they askd wht is V when S is open///
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what did you guys get for the voltage at S when it is open and at the voltmeter when S is open? ???
i wrote 12 but later i found dat the ans is 0
there where two questions. Which did you say is O?
the place where they askd wht is V when S is open///
when the circuit is open its obvious that everything would be O bcuz no current no voltsage
i wrote the vaukle but realsied when i READ the othe part which said when the circuit is colsed i am like wait a minute whats for a) so yaaa:D
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yeah for wen the switch is open both were 0V but for when the switch is closed then there was voltage....
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HEY CAN ANYONE PLEASE TELLL MEE IF THEY USED EFFICIENCY EQUATION TO FIND POWER OUTPUT?????????
efficiency = power output/power input * 100???
and did they get 54W or something like that??
and d fraction is 1/8????
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yeah thst correct...unfortunately i didnt get tht.....
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are u sure 54W its correct??? because people got 54000 or something... :S
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i got first output = 54000 W and my fraction was 1\8 ..but how did you guys know tht 1\8 is surely correct??
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ohhw if i got the values for power output wrong like i got 54W instead of 54000W but i got the fraction correct... how many marks will i lose????????????
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probably two...it will probably be ecf.....and relax...u wont loose a million marks....just relax...think of something tht make u happy.....go read a book...or listen to music...go and try doing something tht u love.....
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I got 54000N too I think :S , wasn't this the 10% Question?
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Yes It was , by working efficiency ...but i got confused as there was 25m given in th ques which I ddnt need to use in any part :-\
Anywayy I hope th curve will help us all ;)
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Oh my god! I did that question by luck since I couldn't get my brains working properly :p! I also got the mass of the other wind, but i'm not sure of the fraction! I forgot to simplify it! :X!!! I wrote it (the answer that i got in the previous question)/54000 ! :(
Oh well ;p , don't worry guys we'll all do fine :). But I just hate how I remember answers after my exam -_-...
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i chooose aluminium as the metal, and for the diode, the answere is A, the last question, the electric fiel i wrote it should act downwards to cancel it out. for the direction of the force i wrote diagonal to the road!! i didn't know how else to express it. did any1 get the Piston question 1? Cause on my paper there was nothing like Gm or Micrometer???
i had the piston as quest number 1 :D
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piston!!!
may be u got da 1st varient
By the way....wat was da question
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it was sth like:
the piston goes up and down approximately 72 times per minute. how could you accurately measure the time taken for one up-and-down cycle?
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OH MAN............................
AFTER SEEING THIS IWANNA BURST OUT INTO TEARS...... :'( :'( :'( :'( :'( :'( :'( :'( :'( :'( :'(
I WISHED I WOULD HAVE GOT THE 1ST VARIENT...........
OH DA TEARS IN MY EYES......R ROLLIN DOWN......
U DONT KNOW HOW LUCKY U R
Y DA HELL DIDNT I GET THIS QUESTIPON IT WAS SO EASY..............
OUR QUESTION WAS LIKE...
A MAN IS HAVING 10 SHEETS OF PLASTIC..
HOW WILL U FIND THE THICKNESS OF ONE OF THEM...
PLZ TELL ME UR SUGGESTIONS..............CARE
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well... you can measure the thickness of the 10 plastic sheets. and divide the value by 10... repeat the measurements?
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i wrote da same..............
but using a ruler right?????
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i think so...
because plastic sheet is probably thicker than paper sheet, so 10 sheets of it could be measured by a ruler..
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dus any1 remember da Al & steel que were of how many marks??????
and wich was da denser medium??????????
I put the medium A, because the ray goes AWAY FROM THE NORMAL when it passess from more dense to less dense(from medium A to air)
I hope its right :-\
:D
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the medium was air.....i think
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Yes It was , by working efficiency ...but i got confused as there was 25m given in th ques which I ddnt need to use in any part :-\
Anywayy I hope th curve will help us all ;)
Efficiency ??? I hope u did a diff variant paper, bec as far as I remember I used E=PT to solve the equation; E was 10% of the previous answer, and T was 1 second, so just substitute in the formula to find the power output....am I right?
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the medium was air.....i think
and what reason did u write ?
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Yes It was , by working efficiency ...but i got confused as there was 25m given in th ques which I ddnt need to use in any part :-\
Anywayy I hope th curve will help us all ;)
Efficiency ??? I hope u did a diff variant paper, bec as far as I remember I used E=PT to solve the equation; E was 10% of the previous answer, and T was 1 second, so just substitute in the formula to find the power output....am I right?
Yeah, i think that was my same question -_-.... what was your final answer? 54000?
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the medium was air.....i think
and what reason did u write ?
i forgot da question can u tell the question
cuz i only remember i wrote air
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umm..the denser medium was medium A guys as ray was bending away from normal when entering air!
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umm..the denser medium was medium A guys as ray was bending away from normal when entering air!
yeah agree wth u n yawht was d critical angle wasnt it 43
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hey whch xpands mur ice or water?
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hey whch xpands mur ice or water?
I put water...because technically, when the ice is in the freezer (o-4c) it gets bigger, so when they are both melted..ice will be less water (becasue it only looked bigger) and water will stay the same... You get mah flow?
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but solids expand mur dan liquids.....
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liquids expand more than solids cuz there molecules are more further apart than in solids.....
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are u sure 54W its correct??? because people got 54000 or something... :S
it was 54000 because dey are not askin u how efficient it is dey jus said 10% of the total kinetic energy tht was 540000 is converted to electrical so tht wuld be equal to 54000
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MADEE: thats right!!!!!!!!!!!!!!!
there was no efficiency it was simple math
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both work, E=pt and efficiency...i first thought it was simple math to mutily 10% times previous answer but wen i saw ''include any equations, i realised there was a rule they wanted which could not only be (percentage X answer) :-\...even though both get the same answer...did u guys gert th fraction as 1\8??
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i got 1/8 and its 100% correct
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r u sure its correct?? cz sm ppl say we should hav doubled th mass cz slower winds are heavier and tht way the fraction would be 1\2 :S ...did u ask any teacher or anyone other than students??
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r u sure its correct?? cz sm ppl say we should hav doubled th mass cz slower winds are heavier and tht way the fraction would be 1\2 :S ...did u ask any teacher or anyone other than students??
i did not get 1/8 i got 11/2 according to me wen the wind speed is half the mass displace will also be half so that brings it to a ratio of 1:2
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How did you guys get the 1/8 fraction?
Step by step please?
Wasn't it the second answer over the first answer (54000?)
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ok 1 st ans was 540000 J!!
agreed!!
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now 4 the 2nd question!!!
the said 10% of ke...
so...10/100x540000=54000J
OK!!!!!!!!
NOW POWER=WORKDONE/TIME TAKEN
SO WORKDONE=KE
HENCE 54000/1
CUZ TIME WAS 1 SECOND!!!!!!
SO ANS=54000W OK
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they accept efficiency rule too instead of power= energy\time ??? ??
for th fraction part , i calculated kinetic energy for half h wind speed and calculated output energy by muliplying by 10%
second answer\first one = 0.125 which is 1\8...
what fractions dd u get??
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i git 1/8 wat abt u
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IT IS 11 HRS NOW SINCE I JOINED THE FORUM AND MY REP IS -12!!!!!!!!!!!!!!!!!!
THIS IS DEVASTATING ...............
AM I RUDE........................
OR R U GUYZ JEALOUS.................????
WHY WHY WHY......
CUZ IT IS VERY "DE-MOTIVATING" >:( >:( >:(
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IT IS 11 HRS NOW SINCE I JOINED THE FORUM AND MY REP IS -12!!!!!!!!!!!!!!!!!!
THIS IS DEVASTATING ...............
AM I RUDE........................
OR R U GUYZ JEALOUS.................????
WHY WHY WHY......
CUZ IT IS VERY "DE-MOTIVATING" >:( >:( >:(
yes ur rude!!!!!!!!!!! y do u have to keep bragging abt how good u did....and demotivating for u??!! its demotivating for us, more like!!!!!!!!!! if it wasnt for the fact tht i dont minus ppl's rep, then i wud have definitely done urz!!!
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OK.WELL..............AS U CAN SEE ABOVE I ONLY TRIED TO EXPLAIN THE ANS MR.BAKHTAWAR......
AND JUST CUZ U HAD DA WORST PHY PPR3 IT DOESNT MEAN EVERYONE ELSE HAS...no offence.....
anywaz if i hav said something wrong i APOLOGIZE...
R U GUYZ HAPPY KNOW!!!!!!!!!!!!!!!! ;D ;D ;D ;D ;D ;D :o ;) :D :)
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it a she By the way...and stop bragging...thts all we're asking...ok...and i may have had the worst paper and all my other papers may have been the best but u dont see me bragging , do u??? and u dont see anyone else bragging how well they did...do u??and oh plz!! u were not just explaining a question..maybe on this topic but not on other topics....anyways wish u luck for all ur exams...and hope u do really well..as well as u expect....
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XXXXCUSE ME......BRAGGING!!!!!!!!!!!!!!
I NEVER SAID MY PAPER WENT THE BEST ETC......
I JUST SAID IT WAS OK
I NEVER BRAGGED!!!!!!!!
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XXXXCUSE ME......BRAGGING!!!!!!!!!!!!!!
I NEVER SAID MY PAPER WENT THE BEST ETC......
I JUST SAID IT WAS OK
I NEVER BRAGGED!!!!!!!!
yeah ok wutever.....but i am sure the ppl who did minus ur rep had a good reason....besides .....seriously it duznt even matter....its just a stipid rep...its not ur real world rep....who cares...anyways where r u from??
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SOUTH africa!!!!!
Johannesburg!!!!!
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dude...seriously...relax...big deal man its just a rep tht duznt count....lol...relax...i dont get y ppl are fussed over this rep so much....
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SOUTH africa!!!!!
Johannesburg!!!!!
ME TOOO!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
Well, half at least :)
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Erm, man the windmill question was a little depressing :'(
Anyway, what I did was.. erm
It's hard to recollect ::)
I guess there was a question before the one where we had to find the mass, where they asked us to find out the power... shwoing all your calculations
Using the efficiency percentage they gave as 10%, I calculated the Energy as 54,000 Joules.
THEN, the E=Pt P= E divided by T. 54000/1 = 54,000 W (watts)
Then, erm, I was really confused for the next one.
I thought about using the Energy formula itself like KE= 0.5 mv2
but then i thought.. if the velocity is halved, how would the mass increase :-\ cuz technically if the velocity decreased, then the mass of air passing through the turbines should fall...
... So I just used a ratio and got an answer I can't seem to remember ???
BUT I think I'm wrong. As they said earlier, probably a heavier mass would mean that speed has decreased :-[
BUT I DID get the fraction as 1/8... These two answers were really difficult >:(
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Erm, man the windmill question was a little depressing :'(
Anyway, what I did was.. erm
It's hard to recollect ::)
I guess there was a question before the one where we had to find the mass, where they asked us to find out the power... shwoing all your calculations
Using the efficiency percentage they gave as 10%, I calculated the Energy as 54,000 Joules.
THEN, the E=Pt P= E divided by T. 54000/1 = 54,000 W (watts)
Then, erm, I was really confused for the next one.
I thought about using the Energy formula itself like KE= 0.5 mv2
but then i thought.. if the velocity is halved, how would the mass increase :-\ cuz technically if the velocity decreased, then the mass of air passing through the turbines should fall...
... So I just used a ratio and got an answer I can't seem to remember ???
BUT I think I'm wrong. As they said earlier, probably a heavier mass would mean that speed has decreased :-[
BUT I DID get the fraction as 1/8... These two answers were really difficult >:(
most people got 1/8... i guess it the correct answer.. hopefully.. or maybe we all are wrong and examiners have something completely different to amaze us wen freeexampapers get the question paper and mark schemes lol ;D
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nice...rep kill..
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Erm, man the windmill question was a little depressing :'(
Anyway, what I did was.. erm
It's hard to recollect ::)
I guess there was a question before the one where we had to find the mass, where they asked us to find out the power... shwoing all your calculations
Using the efficiency percentage they gave as 10%, I calculated the Energy as 54,000 Joules.
THEN, the E=Pt P= E divided by T. 54000/1 = 54,000 W (watts)
Then, erm, I was really confused for the next one.
I thought about using the Energy formula itself like KE= 0.5 mv2
but then i thought.. if the velocity is halved, how would the mass increase :-\ cuz technically if the velocity decreased, then the mass of air passing through the turbines should fall...
... So I just used a ratio and got an answer I can't seem to remember ???
BUT I think I'm wrong. As they said earlier, probably a heavier mass would mean that speed has decreased :-[
BUT I DID get the fraction as 1/8... These two answers were really difficult >:(
why do you think that those wind mills (i can't remember the real name) are built in places with a lot of wind (with a high speed)? because, the faster the wind is, more air passes through the windmill... so, when the speed of wind is halved, than the mass of air is halved... so 1/8 is the correct answer!
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ok ppl its past and i think u should forget it
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i agree :D
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just one last que.
in da diode que. was it given dat da diodes work in reverse bias??????//
plzzzzzz reply ;) dats my last que. :P
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just one last que.
in da diode que. was it given dat da diodes work in reverse bias??????//
plzzzzzz reply ;) dats my last que. :P
I dont think it said it worked reverse or anything like tht.. it jst mentioned tht it shod go from red to black and its normal diode. They were very very trickly placed in diagrams.. I got D as answer.. many ppl put A and C.. no one did B so i guess B is definately wrong.. or possible we are all wrong and B is correct :P who knows.. lool.
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just one last que.
in da diode que. was it given dat da diodes work in reverse bias??????//
plzzzzzz reply ;) dats my last que. :P
I dont think it said it worked reverse or anything like tht.. it jst mentioned tht it shod go from red to black and its normal diode. They were very very trickly placed in diagrams.. I got D as answer.. many ppl put A and C.. no one did B so i guess B is definately wrong.. or possible we are all wrong and B is correct :P who knows.. lool.
I put B :D......I wonder.... :-\ :-[
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just one last que.
in da diode que. was it given dat da diodes work in reverse bias??????//
plzzzzzz reply ;) dats my last que. :P
I dont think it said it worked reverse or anything like tht.. it jst mentioned tht it shod go from red to black and its normal diode. They were very very trickly placed in diagrams.. I got D as answer.. many ppl put A and C.. no one did B so i guess B is definately wrong.. or possible we are all wrong and B is correct :P who knows.. lool.
I put B :D......I wonder.... :-\ :-[
oh lool.. i take my words back then.. B is definately not wrong... but it culd be wrong . :P
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just one last que.
in da diode que. was it given dat da diodes work in reverse bias??????//
plzzzzzz reply ;) dats my last que. :P
I dont think it said it worked reverse or anything like tht.. it jst mentioned tht it shod go from red to black and its normal diode. They were very very trickly placed in diagrams.. I got D as answer.. many ppl put A and C.. no one did B so i guess B is definately wrong.. or possible we are all wrong and B is correct :P who knows.. lool.
I put B :D......I wonder.... :-\ :-[
oh lool.. i take my words back then.. B is definately not wrong... but it culd be wrong . :P
:D ;) ;D
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the answer for the Diode is C. 2 diodes facing each other wouldn't make a current flow. C was from black to red, and D was from red to black. A and B would have no current because the whole point of the diode is to make the current flow one way, and if the two are facing each other then where the hell will the current flow? xD they say common sense is not common, i certainly agree. -.-
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the answer for the Diode is C. 2 diodes facing each other wouldn't make a current flow. C was from black to red, and D was from red to black. A and B would have no current because the whole point of the diode is to make the current flow one way, and if the two are facing each other then where the hell will the current flow? xD they say common sense is not common, i certainly agree. -.-
Having a bad Physics teacher will lead students like me to give such answers.-.-
so I guess they also say that good teachers are not common, to which I certainly agree,-.- ;)
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hey guys
You know, in all year 9, we had the worst teacher ever he started the year WITH ELECTRICITY!! HAHA IMAGINE AND WE WERE LIKE WTH IS HE TALKING ABOUT!! Looool
So this year a real expereienced IGCSE physics teacher starting teaching us, we started from the begging and it took us only 4months to finish the whoooole thing, thats by feb!!, then we did past papers like 6 years and everybody was just amazing at physics :)
I found the exam very simple and straight forward, most of it was general physics, no motors no generators etc, :)
Guy what did u get for the diode?? was it A??
Thanks
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what is the answer to the metal question? i wrote aluminium - which i think is wrong (although i hope they condone it). its probably steel but do u think theyll pardon aluminium?
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da pressure will be da same, da guy is applying da same pressure but due to da difference in the areaz it pains him more but da guy is applying da same force. :-\
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i wrote the answer as aluminium and for the diode one...i did A...i dont noe if the dioide one is correct tho.....
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i wrote the answer as aluminium and for the diode one...i did A...i dont noe if the dioide one is correct tho.....
no it is steel, they have the same expansivity because aluminum expands more damaging the building and as for the diode yest the ANSWER IS A :D
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well it is correct ... i asked my tution sir and he has the paper .... he said its A ... and besides its got to be A cause A gives the only direction for red ..... so basically its A
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r u sure its A like completely completely absolutely sure its A......
but if u put steell which has the same expansitivity as concrete, then wuts the point...its gna expand as much as steel....so it wont lock into the concrete....whereas aluminium will lock into concrete and besides concrete is much more stronger than aluminium so aluminium cant harm the buliding....
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r u sure its A like completely completely absolutely sure its A......
but if u put steell which has the same expansitivity as concrete, then wuts the point...its gna expand as much as steel....so it wont lock into the concrete....whereas aluminium will lock into concrete and besides concrete is much more stronger than aluminium so aluminium cant harm the buliding....
yeah we are sure
it doesn't go that way, the point is that when concrete has to expand, steel will expand by exactly the same amount per meter, so this means that there is no negative effect on the structure, but if aluminum was used then, if concrete was to expand by 1cm for example, then aluminum will expand by 2 cm for example, meaning that it will pop out of the concrete block and haha maybe into the above floor!! get it!! :P
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concrete is much stronger than aluminium...it wont let tht happen....anyways wutever its past now...gta prepare for wuts coming...good luck if u r giving bio tomorow....
and Thanks for the diode thing...
+rep!!
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concrete is much stronger than aluminium...it wont let tht happen....anyways wutever its past now...gta prepare for wuts coming...good luck if u r giving bio tomorow....
and Thanks for the diode thing...
+rep!!
sure and yeah its past now BYE gd luck to u to , thanks
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concrete is much stronger than aluminium...it wont let tht happen....anyways wutever its past now...gta prepare for wuts coming...good luck if u r giving bio tomorow....
and Thanks for the diode thing...
+rep!!
If the concrete doesnt allow the exapnsion of alumnium, the aluminium will possibly shatter. And besides, the metal doesnt have to "lock into place" or anything. Its just reinforces the concrete. The way our bones reinforce our legs. If our bones expand more than our legs when heated, they would soon pop out through our hip.
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concrete is much stronger than aluminium...it wont let tht happen....anyways wutever its past now...gta prepare for wuts coming...good luck if u r giving bio tomorow....
and Thanks for the diode thing...
+rep!!
If the concrete doesnt allow the exapnsion of alumnium, the aluminium will possibly shatter. And besides, the metal doesnt have to "lock into place" or anything. Its just reinforces the concrete. The way our bones reinforce our legs. If our bones expand more than our legs when heated, they would soon pop out through our hip.
hahah EXACTLY!!!! :P
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concrete is much stronger than aluminium...it wont let tht happen....anyways wutever its past now...gta prepare for wuts coming...good luck if u r giving bio tomorow....
and Thanks for the diode thing...
+rep!!
If the concrete doesnt allow the exapnsion of alumnium, the aluminium will possibly shatter. And besides, the metal doesnt have to "lock into place" or anything. Its just reinforces the concrete. The way our bones reinforce our legs. If our bones expand more than our legs when heated, they would soon pop out through our hip.
hahah EXACTLY!!!! :P
alryt ppl fine u win.....i lost more marks...Thanks for making me feel btr...
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so wait answer is aluminum ??
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so wait answer is aluminum ??
i wrote tht but apparently ppl dont think so..
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DAMNNNNNNNNN !!!!!!
well i just have to say .. u guys are not CIE sooo im not listening to u :P
jokes !!!!
hope its aluminum
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DAMNNNNNNNNN !!!!!!
well i just have to say .. u guys are not CIE sooo im not listening to u :P
jokes !!!!
hope its aluminum
lol!!! i agree...and i hope its aluminium as well....
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me and Bakhtawar will go on strike just for this question :P
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me and Bakhtawar will go on strike just for this question :P
LOL!!!...hahahahaha!!!!!! ;D
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how can dey pardon a rong answer!?! genius!
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how can dey pardon a rong answer!?! genius!
LOL!!!!! hahaha!!!
i love this forum and its ppl!!!! lol!!!! ;D <3 <3 <3!!!
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who said its wrong ... it maybe correct ... its a 33.33 % of being correct ... so ya .. it could be correct :P
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Salaam guyz! I was wondering how u all r preparing for P1 Physics? Revising the whole syllabus agen? or just doing the Past papers? My p3 sucked a bit...My answers wld not match wid most of my frnds, sorta like acc p3. Trying to pretend it nevr happened till august, but must do well in p1 to balance out...any advice is welcumed....Thanks!
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i am just doing all the pastpapers over again....from 2003 till now...it wud be good if u do them over agian and try to get all 40s and if u get mistakes..then write em on the front page of the ppr also write the correct METHOD and answer and also write the number of the question....and then before the exam revise the pprs...writing all tht down will make it easier to revise cuz u wont have to look thre the whole ppr and u will noe ur mistake from the first glance...good luck...i am just looking forward to writing on tht OMR sheet...hehe.... ;D
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lolz....Thanks 4 replying! i thnk im jst gonna do PPQ too mainly, dunt feel like revising whole syllabus! the OMR sheet, last time i did it was last yr june, luking frwrd to it too...Insha'Allah! Hope we all get full marks in p1...
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DAMNNNNNNNNN !!!!!!
well i just have to say .. u guys are not CIE sooo im not listening to u :P
jokes !!!!
hope its aluminum
lol!!! i agree...and i hope its aluminium as well....
read this: http://en.wikipedia.org/wiki/Reinforced_concrete#Materials
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DAMNNNNNNNNN !!!!!!
well i just have to say .. u guys are not CIE sooo im not listening to u :P
jokes !!!!
hope its aluminum
lol!!! i agree...and i hope its aluminium as well....
read this: http://en.wikipedia.org/wiki/Reinforced_concrete#Materials
i guess it aluminum bcuz it expand the least
rest expand alot for 1*C n engiener wouldnt use such materials bcuz it in some it would expan alot in the ACTUAL HOT WEATHER
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I agree.. i also Put Aluminium. Lets hope thts the correct answer.
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my mum is an engineer and she says that it's steel....
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my mum is an engineer and she says that it's steel....
dude my dad it also an engineer but u wont be putting the actual ans
they might have made up the values and upon them u havd to decide
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guys cie dont expect the candidates to be engineers and wknow what is used to reinforce concrete... i think its just common sense....
they mentioned that the expansion of steel is the same as concrete, and aluminium isnt, so if u use aluminium it would expand at a different rate than concrete, and it would cause problemes to the structure.
and plus... its known that steel is used to reinforce concrete :P ;D
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no it is Steal bcuz Al is soft :-\
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GET OVER IT PPLE!!!!! :o ::)
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guys cie dont expect the candidates to be engineers and wknow what is used to reinforce concrete... i think its just common sense....
they mentioned that the expansion of steel is the same as concrete, and aluminium isnt, so if u use aluminium it would expand at a different rate than concrete, and it would cause problemes to the structure.
and plus... its known that steel is used to reinforce concrete :P ;D
agree
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guys cie dont expect the candidates to be engineers and wknow what is used to reinforce concrete... i think its just common sense....
they mentioned that the expansion of steel is the same as concrete, and aluminium isnt, so if u use aluminium it would expand at a different rate than concrete, and it would cause problemes to the structure.
and plus... its known that steel is used to reinforce concrete :P ;D
agree
wohoo i cant believe i got it right everyone in class told me i did it wrong and i was so depressed u guyz saved my happiness!
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Lol... 20 pages... So hard to let go of what's past :-[
BUT BUT EXAMS ARE COMING TO AN END. WOOHOO! ;D
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can someone answer my question??
https://studentforums.biz/index.php/topic,2599.0.html
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since 21 hours have past, i'm sure by know everyone on the planet have taken the test
so how was it
By the way what was the mass and the fraction on the energy question
i got 1/8 for the fraction thing....and wat did you get for pressure question when they asked wat the pressure would be if the area was doubled? ....i halved the pressure....and the diode i said D ::)
yea so did i get the same answer. hope its right?
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i did evrythng as u guys dd and in da first q i used da alpha emitter and i said 2 put an alpha emitter and put infront of it a paper and behind it a detector and then i said depending on da no of alpha rays able to penetrate da paper and detected by da detector the thickness can b determined if too many rays pass dat means its very thin if nothing passed that means its very thick....is it right? did any1 do it like me ?
i did it like that. duno if its write or not =/
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i hope its correct cause thts my answer too ... i lost hope on this question ... and now u guys are giving me back the hope :P
hope its correct :-[
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GET OVR THE PPR PPL!!!!!THE MORE U DISCUSS,THE MORE I KNO I M GETTING BELOW C!!!!:(:(:(
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GET OVR THE PPR PPL!!!!!THE MORE U DISCUSS,THE MORE I KNO I M GETTING BELOW C!!!!:(:(:(
me too!!!
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lets hope we get marks for it
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Erm, guys how are you preparing, like, COMPLETELY for Paper 1?... So far, I only practiced many papers and I know now that I have to sleep early on the exam night. :P
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Erm, guys how are you preparing, like, COMPLETELY for Paper 1?... So far, I only practiced many papers and I know now that I have to sleep early on the exam night. :P
i am doing papers from 2002 to 2008.....i hope it will be enuf....and yeah i am gna get a good night's sleep as well...
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im doing them form 1993 to 2008 |-)
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HELLO PPL......
r u guys done with ppr 1
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I Just wanna Ask.......Is mm Ruler correct ???
:P
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for using what???
in the exam??
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I wrote mm Ruler as an answer in the first question :-\
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if its the may/june 2009 exam u r talking abt
sorry but i didnt give that exam
hope it is correct... :)
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:D Thanks
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can sum1 explain thermal capacity(high and low)
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high thermal capacity means that
more amount of energy would be needed to change the temptertature of a body by 1degreed
for example
2 kg of aluminium has less thermal capacity than 2 kg of water...
aluminium loosoes and gains temperature faster than water..
thus the low thermal capacity
in this case water has high thermal capacity
IMHO it actually depepends on the mass
in the question
BEST OF LUCK everybody
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thermal capacity can be different for 2 objects of the same material, but different masses. Its SPECIFIC heat capacity that has to be same for similar materials.
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I got the Fraction 1/8..Cause u divide 1/2 the mass and the speed too..I'm pretty sure it correct but why the heck they gave us the diameter of the
thingy??the turbine or whatsoever? For the Diode I"M SURE 100% its A.I did the experiment in Sec3.
For the PD ACROSS S WHEN THE SWITCH IS Open is 0 volt and the same goes for the next question.
Pressure should not be halved for the swimming pool thing.
FOR THE MICROMETER, you should mention Datum line, ratchet and thimble..Well, that my opinion..
Wow Wahab09..You're good!
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^ the pressure of water at that point remains unchanged as the density, height and g are the same=> pressure= d x h x g.......
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Phys paper1 isnt THAAAATT easy.. so be prepared.. ^^
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Physics paper 1 was soooo easy!!! ;D
I might even get full!!
Im amazed at some of the people's mistake. They kinda fell prey to CIE's tricks.
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physics ppr 1 was okay ppl!! dont freak out!....just be carefull....they have some tricks in it....
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I Just wanna Ask.......Is mm Ruler correct ???
:P
tell u wat....i wrote the same... ithink its correct.....cause mm ruler is so acurrate in mm
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wat abt ppr1
r we allowed to discuss it now?
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wat abt ppr1
r we allowed to discuss it now?
u r probably gna be able to discuss it tomorow...cuz 24 hrs will be over then....how did u do anyway??
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wat abt ppr1
r we allowed to discuss it now?
not yet.. its not quite 24 hrs but only abt 8 hours :)
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It was tricky...
But hopefully, I've done well :)
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yeah they had the creepy tricks in it...but i think i did ok...
alhamdulillah... ;D
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yeah they had the creepy tricks in it...but i think i did ok...
alhamdulillah... ;D
Good, alhamdulilah..
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Thanks esso :D