IGCSE/GCSE/O & A Level/IB/University Student Forum
Qualification => Subject Doubts => IGCSE/ GCSE => Sciences => Topic started by: Guthixol on June 09, 2009, 12:06:58 pm
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i will start off :D: PLEASE ANSWER ALL THESE :) THANKS!!!!
paper 1 may/june 2008; q3, q4, q7, q8, q10, q11, q12, q16, q18, q19, q22, q27, q28, q29, q31, q33, q35, q36, q37, q38
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C,C,B,D,D,C,C,D,A,B,C,
HERE U GO
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Hey! Can some one explain question 37 in May/June 08? Thanks ;)
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Hey! Can some one explain question 37 in May/June 08? Thanks ;)
It's C cause when the resistance of one decreases the current passing increases, this increases the voltage across the potential divider which has a higher resistance. do u want me to explain with some figures..it may help..let me know if u don't understand
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can some1 explain how to so ques which give us the mp and mbp of a substance compared to the liquid or solid temp they've given, like o/n 2005 q16.thx
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Thanks Nid404! +rep!
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May 1998 paper1 can someone pls explain why the answer is C and not B?
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May 1998 paper1 can someone pls explain why the answer is C and not B?
sorry may 1998 paper1 q.31. why is the answer "C" and "b"
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can some1 explain how to so ques which give us the mp and mbp of a substance compared to the liquid or solid temp they've given, like o/n 2005 q16.thx
i'll ans that using the question in year 2005
In this case since 25 is the room temp
a liquid would have a melting point less than this temp and boiling point more than this temp
a solid would have its melting point and boiling point more than this temp
a gas will have its melting and boiling point less than this temp
so in this case the ans will be B.
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May 1998 paper1 can someone pls explain why the answer is C and not B?
sorry may 1998 paper1 q.31. why is the answer "C" and "b"
give me two min i'll get back...phone's ringing
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thx. how do i rep u
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thx. how do i rep u
it's ok..just remember me in ur prayers
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IGSTUDENT could u attach the paper plz or type out the question cuz my document has an error..not opening
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for q31,o/n 2005 why is the ans A, when resistor is being used
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also need help withq33, same paper
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for q31,o/n 2005 why is the ans A, when resistor is being used
when the switch is closed the current takes the simpler route through the switch(where there is no resistor) and does not pass through R(this is called short circuit). This results in the lamp becoming brighter(as current through it increases)
For Q.33 it's A again because the fuse is connected in the main wire...and not to individual components(i hope u get that). SO if this fuse melts all the lamps stop working
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someone explain to me
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i will start off :D: PLEASE ANSWER ALL THESE :) THANKS!!!!
paper 1 may/june 2008; q3, q4, q7, q8, q10, q11, q12, q16, q18, q19, q22, q27, q28, q29, q31, q33, q35, q36, q37, q38
is that a joke...im sorry that's a very long list..ill need help to help u with that..lol
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thx once again
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thx once again
anytime :)
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https://studentforums.biz/index.php/topic,2342.45.html
May 1998 Q.No.31 nid 404 can u explain pls/
thanks
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Hey....4 the same paper w_05_qp1 q35 shudnt it b A by right hand thmb rule..?? the mark scheme says B
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https://studentforums.biz/index.php/topic,2342.45.html
May 1998 Q.No.31 nid 404 can u explain pls/
thanks
i tried downloading but it's not opening
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Hey....4 the same paper w_05_qp1 q35 shudnt it b A by right hand thmb rule..?? the mark scheme says B
wire is carrying current into the paper so thumb points downwards..this will result in a field shape like B
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someone explain to me q3 may/june 2008
Thank You:D
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m/j 2005, q21, isnt it supposed to be refraction, D not A diffraction thats what it says in my book
plz help!
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m/j 2005, q21, isnt it supposed to be refraction, D not A diffraction thats what it says in my book
plz help!
refration occurs when speed and wavelength of the waves change..there is nothing of that sort happening. When circular wavelets form it is duffraction(in this case thru a wide gap)
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ppl there is smthn dat i dnt get june 1999 question 34???can any1 help i cnt really c da difference between da bells??
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who can explain to me this easy question...nov/04...30..
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someone explain to me q3 may/june 2008
Thank You:D
average speed=total distance/total time
total distance-25x3=75km
time=0.5hrs
therefore speed=75x2=150km/hr
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who can explain to me this easy question...nov/04...30..
this is because in this question the current splits to go through the 2 resistors ( so each one gets 1 Amp)
but when the current combines again, it goes back to the normal reading which is 2 amps
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ppl there is smthn dat i dnt get june 1999 question 34???can any1 help i cnt really c da difference between da bells??
a magnetism is induced in the arm when a current passes and the arm is attracted to the electromagnet so the bell rings
then the circuit is shorted so nu current flows in the magnet and the arm is released and the whole thing happens again
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someone explain to me q3 may/june 2008
Thank You:D
average speed=total distance/total time
total distance-25x3=75km
time=0.5hrs
therefore speed=75x2=150km/hr
why 75 x 2??..
it should be 75/0.5....
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@cool dude: 75/0.5=75/1/2
and 75 divided by 1/2 is 75x2
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i have a question in june 2007, q22 , how the hell would i know that the angle of incidence at mirror Y is 60° ?
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who can explain to me this easy question...nov/04...30..
this is because in this question the current splits to go through the 2 resistors ( so each one gets 1 Amp)
but when the current combines again, it goes back to the normal reading which is 2 amps
how do u know..1 resistor 1 amp?..
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@cool dude: 75/0.5=75/1/2
and 75 divided by 1/2 is 75x2
haha..okok..
but then, u wrote the equation..and u didnt use it..
nway, thats fine..
;D
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i have a question in june 2007, q22 , how the hell would i know that the angle of incidence at mirror Y is 60° ?
90-30=60
this should tell u
angle of incidence is the angle between the normal and the incident ray.
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who can explain to me this easy question...nov/04...30..
this is because in this question the current splits to go through the 2 resistors ( so each one gets 1 Amp)
but when the current combines again, it goes back to the normal reading which is 2 amps
how do u know..1 resistor 1 amp?..
because there are 2 resistors each one is 2 ohms, so the current splits equally between them because they have the same resistance
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who can explain to me this easy question...nov/04...30..
this is because in this question the current splits to go through the 2 resistors ( so each one gets 1 Amp)
but when the current combines again, it goes back to the normal reading which is 2 amps
how do u know..1 resistor 1 amp?..
because there are 2 resistors each one is 2 ohms, so the current splits equally between them because they have the same resistance
hurmm...thankss..
+rep..
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i have a question in june 2007, q22 , how the hell would i know that the angle of incidence at mirror Y is 60° ?
90-30=60
this should tell u
angle of incidence is the angle between the normal and the incident ray.
ayt Thanks nid404
and Thanks cool dude
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ppl there is smthn dat i dnt get june 1999 question 34???can any1 help i cnt really c da difference between da bells??
a magnetism is induced in the arm when a current passes and the arm is attracted to the electromagnet so the bell rings
then the circuit is shorted so nu current flows in the magnet and the arm is released and the whole thing happens again
man i still dnt get it i mean y cnt it b C OR D???anywayzz Thanks 4 da help
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= lilwyne, no problemo..
hurmm...another quest is..how do we know which fuse can we use..? nov/04..34
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= lilwyne, no problemo..
hurmm...another quest is..how do we know which fuse can we use..? nov/04..34
( november 2004, paper 1, question 34 )
B - the 3 A one
its not 50 A or 10 A because it wil be able to take the current of the mains and lead respectively...and probably affect the hair dryer
u cant put a 1A fuse too because the device needs 2A...
therefore B -- 3A
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= lilwyne, no problemo..
hurmm...another quest is..how do we know which fuse can we use..? nov/04..34
it says the hair dryer takes 2amps, and the lead can carry 5amps
so it cant be blow 2amps cuz then the fuse would blow and hair dryer wont work, and it cant be above 5amps, cuz the hairdryer might get messed up
so it has to be between 2-5, and thonly answer there which is between 2-5 is 3amp fuse
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= lilwyne, no problemo..
hurmm...another quest is..how do we know which fuse can we use..? nov/04..34
it says the hair dryer takes 2amps, and the lead can carry 5amps
so it cant be blow 2amps cuz then the fuse would blow and hair dryer wont work, and it cant be above 5amps, cuz the hairdryer might get messed up
so it has to be between 2-5, and thonly answer there which is between 2-5 is 3amp fuse
oowhh...great..
+rep to eddie and lilwayne..
;D..
why i got -rep?..
sory if i did something wrong
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+rep to lilwayne and u too :)
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hey can sum1 pls help,... i hav no idea how to revise 4 this exam...
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hey can sum1 pls help,... i hav no idea how to revise 4 this exam...
ahahaha, just do as many pastpapers as u can, and try to get all 90 and above, and u will be fine
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solve past papers....including the 1990s papers
chk out the websites and resources posted earlier'
good luck :)
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i cant find the 90s papers. can some1 help plz
thx
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https://studentforums.biz/index.php/topic,2342.45.html
hmh had uploaded many papers (paper 1)
good luck
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Thanks so much!!!
how do i rep u
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since paper 1 is tomorrow here is an additional 1999 paper for practice
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Thanks so much!!!
how do i rep u
lol..no need of that
happy to help u..
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MJ 05 ques. 23....how do i noe which is the focal length? ???
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statement : a ray parallel to the princilpe line will always refract and pass through the focus..
here the line at the top passes parallel and refracts and meets at 10cm (from the optical center)
therefore it is 10cm - "B"
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got it..Thanks ;D...and also ques.32 same paper...how is it B and not A?
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got it..Thanks ;D...and also ques.32 same paper...how is it B and not A?
In A it is connected in parallel..it won't change the p.d. The lamp will get the mains supply. Whereas in B the resistor is a potential divider and can vary the voltage . I hope uve understood
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got it..Thanks ;D...and also ques.32 same paper...how is it B and not A?
In A it is connected in parallel..it won't change the p.d. The lamp will get the mains supply. Whereas in B the resistor is a potential divider and can vary the voltage . I hope uve understood
ohh got it//
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Can some1 explain wavefronts in water i cant get them :S!! May/June 2007 i think 30-35q
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Can some1 explain wavefronts in water i cant get them :S!! May/June 2007 i think 30-35q
specify the question plz
but basically a wavefront is a line joining in phase points in a wave such as two crests or two troughs.
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DOUBT!!!!!!!!!!!!
QUE.37 MAY08????????????
WY IS IT "C" NUT "D"???
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now i get it...thnk u soo much! ;D :D ;D
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DOUBT!!!!!!!!!!!!
QUE.37 MAY08????????????
WY IS IT "C" NUT "D"???
i am confused in this too
nid404 --- help
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DOUBT!!!!!!!!!!!!
QUE.37 MAY08????????????
WY IS IT "C" NUT "D"???
k. i'll use values to explain
take the voltage from the source to be 20V
so current in the first circuit would be-20/200(combined resistance)=0.01
so voltage across each resistor would be 10V(0.01x100) since V=IR
In the second circuit current would be 20/190=0.105
so voltage across 90ohms would be=0.105x90=9.45
and voltage across 100ohms=0.105x100=10.05
so voltage across the higher resistor increases
hope u got that
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You guys can someone explain May/June 03 Q 17, does a small temp. rise mean high thermal capacity? The answer according to mark schemes is A.
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may/june 2007 question 20 what should i do to answer these kind of questions?
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ohh tks
cud this be the possible explanation
V = I*R
I = V/R
R decreases - I increases
when I increases V increases too///
(i don't think so)
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You guys can someone explain May/June 03 Q 17, does a small temp. rise mean high thermal capacity? The answer according to mark schemes is A.
yes thermal capacity=energy required to raise the temperature of the entire mass of substance by 1oC. So lesser the temp rise more the thermal capacity.
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thermal capacity = mass * specific heat capacity
specific heat capacity = heat received / (mass * temp change)
if the temp change is the least the specific heat capacity will be the greatest and therefore the thermal capacity will be the greatest
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answer me!! >:(
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ohh tks
cud this be the possible explanation
V = I*R
I = V/R
R decreases - I increases
when I increases V increases too///
(i don't think so)
what r trying to explain??
@thisishard: pls be patient im not a robot.
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@nid - its k...i guess i'm wrong...thanks anyway
@ thisishard - i think the wavelength increases because the frequency doesn't change
speed = frequency * wavelength
speed increases - frequency constant - wavelength increases...
nid404 can help u
i have few problems in these type of questions too
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may/june 2007 question 20 what should i do to answer these kind of questions?
when the wave moves from shallow water to deep water, wavelength increases and the wavefronts move towards the normal. So the ans is C.
Tip-try drawing a normal to the wavefront and check whether refraction is towards the normal or away. if towatds then water is deeper, if away then waves have moved into shallow water
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may/june 2007 question 20 what should i do to answer these kind of questions?
b the waves get closer together and bend away from the interface
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its C..
wavelength increases not decreases
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may/june 2007 question 20 what should i do to answer these kind of questions?
b the waves get closer together and bend away from the interface
sir i think it bends towards the normal at the point of depth change. Ideally it should be C
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the waves move further apart
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the waves move further apart
it does
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May june 1999 my answers. I hope someone can review them
1. D
2. C
3. B
4. D
5. D
6. C
7. B
8. C
9. C
10. D
11. C
12. C
13. C
14. A
15. B
16. B
17. C
18. C
19. C
20. A
21. B
22. A
23. D
24. A
25. C
26. A
27. C
28. B
29. C
30. A
31. B
32. D
33. A
34. A
35. A
36. B
37. A
38. A
39. C
40. D
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hey does anyone have the physics may/june 2002 markscheme for paper 1.....plzz send them to me here if any body does have it...thank u
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hey does anyone have the physics may/june 2002 markscheme for paper 1.....plzz send them to me here if any body does have it...thank u
attached
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THANX SO MUCH :-*
CAN SUM1 XPLAIN QUE.2 AND QUE.38 OCT08???////
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Q2.) the ball accelerates in all the positions...
Q 38.) the initial count is 140 its half i 70.,..which lies between the range 82 - 62 counts
the corresponding time is 40-60
:)
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hello everyone, i need help in May/june 2005 Question 3, it says the answer is C but i think its wrong
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hello everyone, i need help in May/june 2005 Question 3, it says the answer is C but i think its wrong
exactly...i have the same problem here...the answer should be D..i think there's a mistake in the mark scheme :-\
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hey!!can someone please explain nov 08 question 23,thanx
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hello everyone, i need help in May/june 2005 Question 3, it says the answer is C but i think its wrong
exactly...i have the same problem here...the answer should be D..i think there's a mistake in the mark scheme :-\
speed = distance / time
20= distance / 10
distance = 200
2 is the slop
200/2
= 100m so i think its right
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hey!!can someone please explain nov 08 question 23,thanx
its B
P and S
1.8/2 = 2.7/3 = 0.9
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Guys i cant get the ans P1 MJ08 Q24 ???
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hello everyone, i need help in May/june 2005 Question 3, it says the answer is C but i think its wrong
speed = distance / time
20= distance / 10
distance = 200
2 is the slop
200/2
= 100m so i think its right
yeah u r rite...i got it....thanks :)
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guys a question plzz help
Why are the electric lamps in a house lighting circuit normally connected in parallel?
A The current in every circuit must be the same.
B The lamps are always switched on and off at the same time.
C The voltage across each lamp must be the mains voltage.
D When one of the lamps blows, all the others go out.
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When electricity is transmitted over long distances, energy is wasted. How can the wasted
energy be kept as small as possible?
A Keep the current in the transmission lines as large as possible.
B Keep the power supplied to the transmission lines as large as possible.
C Keep the resistance of the transmission lines as large as possible.
D Keep the voltage supplied to the transmission lines as large as possible.
this one also plzz
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guys a question plzz help
Why are the electric lamps in a house lighting circuit normally connected in parallel?
A The current in every circuit must be the same.
B The lamps are always switched on and off at the same time.
C The voltage across each lamp must be the mains voltage.
D When one of the lamps blows, all the others go out.
C. The only possible ans
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When electricity is transmitted over long distances, energy is wasted. How can the wasted
energy be kept as small as possible?
A Keep the current in the transmission lines as large as possible.
B Keep the power supplied to the transmission lines as large as possible.
C Keep the resistance of the transmission lines as large as possible.
D Keep the voltage supplied to the transmission lines as large as possible.
this one also plzz
D. power loss=I2R...so I and R can't be big. It has to be Voltage
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ON 2003 ques.6,21 and 27...dont get them...explain plss :-\
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ans 6.) mass of half oil = 1.3 - 0.9 = 0.4
therefore mass of only full oil in the bottle = 0.4 * 2 = 0.8
therefore mass of only bottle = 1.3 - 0.8 = 0.5
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ON 2003 ques.6,21 and 27...dont get them...explain plss :-\
Q.6- okay theoritically say x is the mass of the bottle
then 1.30+x/2=0.90
x=0.50kg
Q.21-waves travel least in shallow water. So check the distance..A is least
Q.27- This is B cuz the steel ball gets attracted to the magnet
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21) notice the waves near A
they are different
27.) i think it shud be B or C
mostly C
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no according to the marking scheme ans. 27 is B...but i still dont get it??
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hmmm.....watermelon! :P
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no according to the marking scheme ans. 27 is B...but i still dont get it??
yes it is B the order is different so I wrote C. It's B...i've corrected it
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correct its B
because as it attracts the path changes..
but nid says C
how come??
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oh yaa..
just noticed it
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hmmm.....watermelon! :P
thats random
lol..
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correct its B
because as it attracts the path changes..
but nid says C
how come??
hey it is horizontal table and the magnet is not strong to attract it to up so it is C
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oh yaa..
just noticed it
actually i thought B was vertically below so ended up writing C
@godfather:Do u want me to crack a watermelon on ur head...ull come to senses
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markscheme says B
confused now
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correct its B
because as it attracts the path changes..
but nid says C
how come??
hey it is horizontal table and the magnet is not strong to attract it to up so it is C
it doesn't matter whether the table is horizontal or not. But a steel magnet is attracted by the magnet. It is B
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oh yaa..
just noticed it
actually i thought B was vertically below so ended up writing C
@godfather:Do u want me to crack a watermelon on ur head...ull come to senses
lol. just enjoying my watermelon. probably the last good one before coming to india.
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OK THE MARKSCHEME IS ALWAYS CORRECT
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QUESTION NUMBER 27 IS B
NO CONFUSION NOW
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november 2007 paper 3 Q 6 a
i just want the diagram for the image for the plane mirror
thanks
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QUESTION NUMBER 27 IS B
NO CONFUSION NOW
answer to....
lol..
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Can any one send the answers of novermber 2006 physic paper 1
my pc has problem with adobe reader ??
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oh yaa..
just noticed it
actually i thought B was vertically below so ended up writing C
@godfather:Do u want me to crack a watermelon on ur head...ull come to senses
lol. just enjoying my watermelon. probably the last good one before coming to india.
now i'm looking for a rod to crack ur skull open...w8 makes u think India lacks good watermelon???????????????????????
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GUYS - sorry to crash the party BUT we already have a physics help thread!!
Please dont create multiple threads!! :)
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and YES - india doesnt lack good watermelons :D
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Can any one send the answers of novermber 2006 physic paper 1
my pc has problem with adobe reader ??
here u go
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november 2007 paper 3 Q 6 a
i just want the diagram for the image for the plane mirror
thanks
plzz answer
@angell..okk as u say...i'll post my doubts there too
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oh yaa..
just noticed it
actually i thought B was vertically below so ended up writing C
@godfather:Do u want me to crack a watermelon on ur head...ull come to senses
now i'm looking for a rod to crack ur skull open...w8 makes u think India lacks good watermelon???????????????????????
by experience i know! the watermelons r tempting but most of the time cause they r artificially injected with colours. my friend got jaundice because of that. not that i'm saying india doesn't have good watermelons, but the ones here r known to be the sweetest in the world and all are naturally made (the people here don't use artificial fertillisers because some can't afford it while other's dunno know about it).
lol. just enjoying my watermelon. probably the last good one before coming to india.
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oh yaa..
just noticed it
actually i thought B was vertically below so ended up writing C
@godfather:Do u want me to crack a watermelon on ur head...ull come to senses
now i'm looking for a rod to crack ur skull open...w8 makes u think India lacks good watermelon???????????????????????
by experience i know! the watermelons r tempting but most of the time cause they r artificially injected with colours. my friend got jaundice because of that. not that i'm saying india doesn't have good watermelons, but the ones here r known to be the sweetest in the world and all are naturally made (the people here don't use artificial fertillisers because some can't afford it while other's dunno know about it).
lol. just enjoying my watermelon. probably the last good one before coming to india.
We get natural ones here too...u na..forget it.
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LOL...i dnt noe about watermelons...but i wud say "chocolates" ;D...and lots of it.. :P :P!!!
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hey guys how are u? i need important notes about energy transfer and light, thanx alot :)
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hey guys how are u? i need important notes about energy transfer and light, thanx alot :)
http://www.s-cool.co.uk/gcse/physics.html
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well thanx alot what do u think about the exam will be tomorrow ??