IGCSE/GCSE/O & A Level/IB/University Student Forum
Qualification => Reference Material => GCE AS & A2 Level => Revison Notes => Topic started by: MaNi_DaDuDe on November 11, 2009, 10:35:52 am
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Hello! :D
I'm currently going through measurements and accuracies (topic 1 :-[ ).
Anyone know what to focus on for paper 1s? Any frequently asked questions, etc?
Thanks again.
PeaXe.
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hmm.
uncertainties, obvs.
and i think in one or two papers they asked about the micrometer screw gauge?
oh and you should know the difference between accuracy and precision..
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hmm.
uncertainties, obvs.
and i think in one or two papers they asked about the micrometer screw gauge?
oh and you should know the difference between accuracy and precision..
Thanks for sharing ! :)
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of course :D
have you started doing past papers yet?
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naw man.. :(
I just got home. Went for a long walk (weather is so awesome man), then went for shawarma; lol.
On topic 2 now. EF ME.
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naw man.. :(
I just got home. Went for a long walk (weather is so awesome man), then went for shawarma; lol.
On topic 2 now. EF ME.
amagad, at this rate you won't have time to do past papersssssssss D:
i think you should skip the revising and just do past papers with me ;D
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amagad, at this rate you won't have time to do past papersssssssss D:
i think you should skip the revising and just do past papers with me ;D
I'll try to do that tomorrow.
My waves are bull. I need to revise electricity and Newtonian/Kinematics blah. :(
What papers you starting from? I mean years?
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Hey,
Do you know where to get past papers before 2002, FEP only has papers till 2002 and i was hoping do get more practice doing further papers. Not necessarily for Physics, not enough time, but for subjects like Chemistry i got a lot of time to do past papers for multi-choice, so if you know where to access papers for the years before 2002, i would greatly appreciate it.
And Good Luck with Physics paper 1 ;D
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I'll try to do that tomorrow.
My waves are bull. I need to revise electricity and Newtonian/Kinematics blah. :(
What papers you starting from? I mean years?
i dunno, i might just start from june 09 and work my way back..
i have to revise formulas and stuff too :(
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Well, I have the papers before 2002 but it's not something of our league so I suggest you not bother about it LOL. If you really want some questions to train yourself on, I'll give you this. It's on Kinematics :) Singapore syllabus haha.
The Question is ( By the way, it's subjective but worth a try ;D ):
A train driver spots another train 80m ahead, moving away from his train. If the driver's train is moving at a speed of 100km/h and the other train is travelling with a speed of 50km/h, what deceleration should the driver apply to his train in order to avoid a collision?
Have fun :)
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Oh right thanks tyserius. But if you know where to get past papers before 2002 for Chemistry i would really appreciate it cause my MCQ for chem is on the 20th of November so i got loads of time to study for it...thanks for the question. :D
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Well, I have the
The Question is ( By the way, it's subjective but worth a try ;D ):
A train driver spots another train 80m ahead, moving away from his train. If the driver's train is moving at a speed of 100km/h and the other train is travelling with a speed of 50km/h, what deceleration should the driver apply to his train in order to avoid a collision?
Have fun :)
V2=u2+2as?
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Well, I have the papers before 2002 but it's not something of our league so I suggest you not bother about it LOL. If you really want some questions to train yourself on, I'll give you this. It's on Kinematics :) Singapore syllabus haha.
The Question is ( By the way, it's subjective but worth a try ;D ):
A train driver spots another train 80m ahead, moving away from his train. If the driver's train is moving at a speed of 100km/h and the other train is travelling with a speed of 50km/h, what deceleration should the driver apply to his train in order to avoid a collision?
Have fun :)
-62.5 ms-2?
no wait.. i forgot to conver tthe kmh-1 to ms-1. bah.
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V2=u2+2as?
Nope you can't do that just that way 'cause both trains are moving just that the driver is having his train faster than the other and if he keeps up the speed he'll definitely collide. So, think about it? :P
@falafail : Haha :P It's not easy, it involves some inequalities :P
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Nope you can't do that just that way 'cause both trains are moving just that the driver is having his train faster than the other and if he keeps up the speed he'll definitely collide. So, think about it? :P
@falafail : Haha :P It's not easy, it involves some inequalities :P
aw, crap. i hate inequalities.
i'll think about it. :(
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aw, crap. i hate inequalities.
i'll think about it. :(
Heheh :P I'll post more questions tomorrow after our paper or maybe during the weekends for the sake of our Paper 2 :D So, just try this first xD
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Heheh :P I'll post more questions tomorrow after our paper or maybe during the weekends for the sake of our Paper 2 :D So, just try this first xD
this is more like a mechanics question than a physics question, though..
i'll figure it out tomorrow XD
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lol nice question okiz after the paper i will do this one :D
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Hello all, could u pls help me with this question?
In a simple electrical circuit. the current in a resistor is measured as (2.50± 0.05)mA. The resistor is marked as having a value of 4.7 ohms ± 2%
If these values were used to calculate the power dissipated in the resistor, what would the percentage uncertainty in the value obtained
A 2% B 4% C 6% D8%
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Hello all, could u pls help me with this question?
In a simple electrical circuit. the current in a resistor is measured as (2.50± 0.05)mA. The resistor is marked as having a value of 4.7 ohms ± 2%
If these values were used to calculate the power dissipated in the resistor, what would the percentage uncertainty in the value obtained
A 2% B 4% C 6% D8%
is it A? :-\
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THE ANSWER IS B
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The answer is actually C... i also got B before. It took me a long time to try and figure why it is C but couldn't. Not even my super genius tution teacher could figure it out
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The answer is actually C... i also got B before. It took me a long time to try and figure why it is C but couldn't. Not even my super genius tution teacher could figure it out
what paper is this?
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May/June 2004
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okay, i don't know about the answer, but did you remember to divide the uncertainty by the actual value that you get for P? to get the percentage uncertainty..
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It's actually pretty simple.. Haha. Well you do know that Power = RI^2. So the percentage uncertainty for Power would be = Percentage Uncertainty of R + 2 ( Percentage Uncertainty of I ) << Because it is I^2 meaning I x I. You would get 2% + 2 (2%) = 6% which is C :)
P.S : If you wanna know how to derive the formula for percentage uncertainty, lemme know :)
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It's actually pretty simple.. Haha. Well you do know that Power = RI^2. So the percentage uncertainty for Power would be = Percentage Uncertainty of R + 2 ( Percentage Uncertainty of I ) << Because it is I^2 meaning I x I. You would get 2% + 2 (2%) = 6% which is C :)
P.S : If you wanna know how to derive the formula for percentage uncertainty, lemme know :)
Yep.
Multiplying or dividing unc --> add
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ahh i see now.. thanks alot mate
This is wat i did:
P=I^2R but then i said 2(0.05/2.50)+0.02/4.7 =0.04
then 0.04*100=4%
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how do u get 2% as uncertainty for I?
Could u pls show me step by step
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well that was simple ._.
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ahh i see now.. thanks alot mate
This is wat i did:
P=I^2R but then i said 2(0.05/2.50)+0.02/4.7 =0.04
then 0.04*100=4%
Just so you know, it is 2% of 4.7 which is 0.094. So, if you wanna actually use the fractional way to do it is :
2(0.05/2.50) + 0.094/4.7 = 0.06
0.06 x 100 = 6% :)
Careless you! To use 0.02/4.7!
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how do u get 2% as uncertainty for I?
Could u pls show me step by step
It's (0.05/2.50) x 100% = 2%
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ahh lol damn i make too many mistakes..well my tution teacher also said that as well.
Thanks for the help mate
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how do u get 2% as uncertainty for I?
Could u pls show me step by step
0.05/2.50 x 100%
Ughh I don't even remember how my paper went :(
Sucked. I didn't have much sleep so it was like I gave the paper, came out and it was like WTF just happend? Seriously..:(
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ahh lol damn i make too many mistakes..well my tution teacher also said that as well.
Thanks for the help mate
I always think that tuition's a waste of time and money :( I rather use that time and money to learn something else such as singing! :D
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Singing...? Ok i guess thats one way to use money :). Tutors are not bad if you really don't understand something but most of the times you understand what you are doing a lot better if you try to figure it out yourself ;)
My advice for the day haha ;D
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What was the useful output question about ????
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yea true true.. my mom forced me cause i am writing my exams.. i was gonna use that money to buy a guitar.
Qusetion but the reading for resistance is 4.7±2% , so why do we have to say 2%*4.7?
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How did you guys find the physics paper 1, easy, medium, hard, made rocket science look easy? I personally found the question paper to be more difficult than the past papers that i've done but some of the questions were really easy like the ones at the end.
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0.05/2.50 x 100%
Ughh I don't even remember how my paper went :(
Sucked. I didn't have much sleep so it was like I gave the paper, came out and it was like WTF just happend? Seriously..:(
You took the paper already too?
Singing...? Ok i guess thats one way to use money . Tutors are not bad if you really don't understand something but most of the times you understand what you are doing a lot better if you try to figure it out yourself
My advice for the day haha
I'm sure you're pretty smart yourself and the paper was not TOO hard but still hard and tricky.
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You took the paper already too?
I'm sure you're pretty smart yourself and the paper was not TOO hard but still hard and tricky.
Yeah. Don't remember anything at all tho. I'll tell you when I do. I feel high.. :(
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Ok yeah.
The collision question. >:|
And in the nodes, how many were there?
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@Tyserius
Why is it 2% of 4.7 ohms?
The reading given in the question is 4.7+- 2% ??
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I guess its too early to discuss about the paper itself but i want to discuss it once we are allowed, some of the questions i wasn' t very sure of when i shaded in the box...but in the end i kind of don't want to discuss it as well because its over and done with... man i'm confused... ??? i don't know what i want to do haha...
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Anyway i got to go back to studying :(.
Good luck with your remaining exams.
Don't worry the holidays are coming soon ;D
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@Tyserius
Why is it 2% of 4.7 ohms?
The reading given in the question is 4.7+- 2% ??
Because you're supposed to find how far it deviates from actual value. So it deviates 2% and you have to find what's the 2% from the actual value :)
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i think my paper 1 sucks!!!
i was too nervous seeing so many words with little number...:(
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i think my paper 1 sucks!!!
i was too nervous seeing so many words with little number...:(
What's over is over. Don't regret the past xD
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i regret that i didnt do well in june, because the paper was a lot easier...........
u did this paper too?
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i think my paper 1 sucks!!!
i was too nervous seeing so many words with little number...:(
Yeah, brain R_____
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what R_____? ??? ??? ???
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what R_____? ??? ??? ???
hmm, can't say it here. Click on "My messages" on the top action bars, and I'll tell you what i meant.
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i regret that i didnt do well in june, because the paper was a lot easier...........
u did this paper too?
Yeah, I did :) It was okay. Just VERY tricky >_<
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What the *censored* was that .__.
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Dude.
They gave us the paper late and then took it at 2:30. I mean WTF. Plus my name makes me the 1st candidate so they take it from me 1st.
Bullshit paper, I had to scribble the last 10 on the scantron randomly (except 39).
Give me 20 more minutes, and I'd have aced it. TOO MANY CALCULATIONS. >:( :@
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Dude.
They gave us the paper late and then took it at 2:30. I mean WTF. Plus my name makes me the 1st candidate so they take it from me 1st.
Bullsh*t paper, I had to scribble the last 10 on the scantron randomly (except 39).
Give me 20 more minutes, and I'd have aced it. TOO MANY CALCULATIONS. >:( :@
yeah, no one had time to finish it.
i guessed 8 of them. ;D
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yeah, no one had time to finish it.
i guessed 8 of them. ;D
Why are you happy?
I just remembered how bad I did, ffs.
How many people retook phy @ your end?
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Why are you happy?
I just remembered how bad I did, ffs.
How many people retook phy @ your end?
i don't know why i'm happy tbh. i'm just not unhappy. i dunno XD
5 people retook it, they all said the same thing: not enough time.
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i don't know why i'm happy tbh. i'm just not unhappy. i dunno XD
5 people retook it, they all said the same thing: not enough time.
No crying club building then.. ::)
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No crying club building then.. ::)
haha, yah ;D
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haha, yah ;D
pfff the paper was quite ok... apart stupid mistakes..
i fink we shud gt a prize for making stupid mistakes sa!!
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pfff the paper was quite ok... apart stupid mistakes..
i fink we shud gt a prize for making stupid mistakes sa!!
did you have enough time to finish it? D:
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God! I hate CIE.
Had a pathetic paper. I guessed like 4 of the answers, and as far as I know I got 2 wrong. Doesn't sound like a lot but you never know how many marks you are going to end up with, because on average I get like 4 wrong just like that. >_<
I just hope the threshold drops really low. I've never got less than an A in any of the past papers I've solved. In fact, I got 39/40 correct in a couple of papers.
I really really hope I get an A or a high B in this one. :(
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oh yeah i hope i gt atleast a B!! ELSE....
i managed to complete in time but a few mre mins wud be wow!!
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urmm...*speechless*
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God! I hate CIE.
Had a pathetic paper. I guessed like 4 of the answers, and as far as I know I got 2 wrong. Doesn't sound like a lot but you never know how many marks you are going to end up with, because on average I get like 4 wrong just like that. >_<
I just hope the threshold drops really low. I've never got less than an A in any of the past papers I've solved. In fact, I got 39/40 correct in a couple of papers.
I really really hope I get an A or a high B in this one. :(
Then I'm pretty sure you would do well..
And By the way, this was the first Physics Paper 1 which I took more time than usual.. Could only double check like 30 questions. Didn't have time to check the last 10 again =/
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Tyserius you had enough time to check all the hard questions, i think the last ten were pretty easy so as long as you were you were able to the check the other 30 you should be fine ;). I managed to finish the paper, but i went back to some questions, i guessed a few..., i'm not happy about that cause in the past papers i managed to understand why i put the answer for each question that i did... >:(.
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Tyserius you had enough time to check all the hard questions, i think the last ten were pretty easy so as long as you were you were able to the check the other 30 you should be fine ;). I managed to finish the paper, but i went back to some questions, i guessed a few..., i'm not happy about that cause in the past papers i managed to understand why i put the answer for each question that i did... >:(.
Lawl. Well, despite checking I didn't notice my answer for the torque with the two gears. I forgot that they gave diameter instead of radius. So careless!
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Don't worry no use thinking about it now, anyways you probably did fine on all the other questions. I think its safe to discuss the paper now so i was wondering what you guys got for that charge q and charge Q question, sorry for being unspecific but i can't really remember the question haha... :D
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Lawl. Well, despite checking I didn't notice my answer for the torque with the two gears. I forgot that they gave diameter instead of radius. So careless!
The correct answer was D right?
bleh, wish I had more time :(
What was the graph? the force one? :S
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Don't worry no use thinking about it now, anyways you probably did fine on all the other questions. I think its safe to discuss the paper now so i was wondering what you guys got for that charge q and charge Q question, sorry for being unspecific but i can't really remember the question haha... :D
Um, I chose F/Q or E/Q.. Whatever it was. Cos I had no idea how to use q :-\
Mani, what graph? D:
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uff the paper sucked!! iwish i had more time!!
june was way easier!!
By the way wat was the ans to Q9 in which we were suppoused to find velocity...it had 0.50 s 3 velocity was given...we were yo fine its velocity afy=ter the force acted on it!.dont remember the magnitude...
:(
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@Mani : Yeah the answer was D for that torque.
@kratos : It is F/q because they asked for field of Q at a distance where q is
@Tumble : It is 2.0ms^-1. You will use F=ma then v=u+at
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@Mani : Yeah the answer was D for that torque.
YAY ;D
@kratos : It is F/q because they asked for field of Q at a distance where q is
DAMN IT >:(
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@Mani : Yeah the answer was D for that torque.
@kratos : It is F/q because they asked for field of Q at a distance where q is
@Tumble : It is 2.0ms^-1. You will use F=ma then v=u+at
it was THAT simple??? :P :-[ :o
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it was THAT simple??? :P :-[ :o
Yeah :D
@fala : The torque was what I got wrong lol.
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Yeah :D
@fala : The torque was what I got wrong lol.
yeah, i figured :P
s'okay, you only got one question wrong. i got AT LEAST 6 wrong :-[ ahaha
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yeah, i figured :P
s'okay, you only got one question wrong. i got AT LEAST 6 wrong :-[ ahaha
LOL getting 6 wrong is fine! Seriously usually the threshold for A is like 30-32/40?
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LOL getting 6 wrong is fine! Seriously usually the threshold for A is like 30-32/40?
i said AT LEASTTTTT. i got 6 wrong out of the 8 that i guessed, dunno about the others though :P haha
it'd be awesome if i got an A.
or a B, at least. if i get a C again (or even worse, a D :o) all of this would've been a waste of time and money :/
which would blowwwwwwwww.
i think the grade threshold's gonna be kinda low though, cos no one i know had time to actually finish the exam.
'cept you ::)
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i said AT LEASTTTTT. i got 6 wrong out of the 8 that i guessed, dunno about the others though :P haha
it'd be awesome if i got an A.
or a B, at least. if i get a C again (or even worse, a D :o) all of this would've been a waste of time and money :/
which would blowwwwwwwww.
i think the grade threshold's gonna be kinda low though, cos no one i know had time to actually finish the exam.
'cept you ::)
LOL I was just lucky xD
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LOL I was just lucky xD
if you say so :P
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Woah Tyserius!
Our answers match EXACTLY!
:D
Except for the torque one...I got that one right. xD
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If ya did some past papers, there were some questions exactly the same from past papers like the locomotive power question and the alpha gold foil scattering question. (If only chemistry did this... )
I made some silly mistakes too such as the 'maxima' question, the answer was 15. I wrote 7. Forgot to double and add the 0th order ><
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It's ridiculous... I got 90% when I did the June 2009 paper the morning before the exam... and then I think I might have dropped to 60% in this one... I think there was too little time, and too many calculations... but since everyone seems to have found it tough, they might hopefully scale it or something...
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I think there was too little time, and too many calculations...
Yep.
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Can someone expand on the infamous torque question, i can't seem to remember it... :D. Yeah i agree we should of had more time to do it. I didn't get enough time to check all my answers, only went through the first 10 >:(.
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If ya did some past papers, there were some questions exactly the same from past papers like the locomotive power question and the alpha gold foil scattering question. (If only chemistry did this... )
I made some silly mistakes too such as the 'maxima' question, the answer was 15. I wrote 7. Forgot to double and add the 0th order ><
Erm, why do you double? Isn't it 7? 'Cause since the wave is diffracted, the coloured fringes are where you can find the superposition happening due to the interference. The dark fringes are with 0 amplitude? I'm not sure. I think it's 7 though... If not, yet another mistake =.=
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Erm, why do you double? Isn't it 7? 'Cause since the wave is diffracted, the coloured fringes are where you can find the superposition happening due to the interference. The dark fringes are with 0 amplitude? I'm not sure. I think it's 7 though... If not, yet another mistake =.=
n=7 is correct, but that is only one side. like
|__________0 th order
|
and then you have them spreading out on both sides as the question asked 'how many maxima can be observed' (I think)
So, there will be 7 on the top, 7 on the bottom and also the 0th order, so 15 in total.
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n=7 is correct, but that is only one side. like
|__________0 th order
|
and then you have them spreading out on both sides as the question asked 'how many maxima can be observed' (I think)
So, there will be 7 on the top, 7 on the bottom and also the 0th order, so 15 in total.
Oh right.. sh*t I forgot I'm only counting one side ~_~ Crap. Oh well, 2 mistakes lol
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Oh right.. sh*t I forgot I'm only counting one side ~_~ Crap. Oh well, 2 mistakes lol
Hey so my answer was right! ;D
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It's ridiculous... I got 90% when I did the June 2009 paper the morning before the exam... and then I think I might have dropped to 60% in this one... I think there was too little time, and too many calculations... but since everyone seems to have found it tough, they might hopefully scale it or something...
Ditto