AS Physics P1 MCQs Preparation Thread.

[kinglynx]

can anyone explain galvanometer experiment to find voltage of a cell thankuuu

THIS ONE : http://ualr.edu/dcwold/phys2122/p23man/p23pot1.jpg

 

[omg]

can anyone explain galvanometer experiment to find voltage of a cell thankuuu

THIS ONE : http://ualr.edu/dcwold/phys2122/p23man/p23pot1.jpg

ur nt gonna get any exp design in this ppr,

 

[Casablanca]

Oct/Nov 2010 paper 11. Question 5.

It's a question about the CRO. Anyone who's done it, can you please explain how to solve it?

 

[bloody_mary]

June 2003 paper 01, q 20 .... ans is A but please some one xplain me

Po=hdg when child is not drinking so pressure in straw equals air pressure

child can lower the pressure (which is air obvioulsy) by 10% which is 1/10
so Po/10 =hdg

rearrange to get h=Po/10dg

 

[bloody_mary]

THIS ONE : http://ualr.edu/dcwold/phys2122/p23man/p23pot1.jpg

that is a potentiometer anways see these notes

 

[MysteRyGiRl]

i remember doing question with my teacher and he said there is something missing in the information given so we weren't able to do it

Q25
use equation f=v/4l for closed tube and f=v/2l for open tube where v is a constant speed of air in this case

so f ' =v/2l
and f=v/4l

divide f ' by f to get 2 which is D

can u explain when we use v/2l and when do we use v/4l ? and plz in details cz am totally confused in this

 

[bloody_mary]

q.13 it cant b D as forces hav to b equal and in opposite direction, they are prependicular here

but if you re-arrange the forces in D you get a couple but for A it is being pulled downards

 

[bloody_mary]

can u explain when we use v/2l and when do we use v/4l ? and plz in details cz am totally confused in this

well according to my physics book f=v/4l is used in closed end tubes
and f=v/2l in open end tubes

 

[omg]

but if you re-arrange the forces in D you get a couple but for A it is being pulled downards

we r nt goin 2 re-arrange the forces

 

[MysteRyGiRl]

well according to my physics book f=v/4l is used in closed end tubes
and f=v/2l in open end tubes

why did u use both da formulas in da question??

 

[bloody_mary]

Oct/Nov 2010 paper 11. Question 5.

It's a question about the CRO. Anyone who's done it, can you please explain how to solve it?

3000 rev in 1 minute
so in 1 sec = (3000/60) =50
50 rev per second now this is the frequency
so period is 1/50 which is 0.02
so 1 wavelength takes 0.02s so to get a good shape 0.01 should be used to show have the wave as well so answer is B

 

[kinglynx]

that is a potentiometer anways see these notes

THANK YOUUUUUUUUU shame i only got this now it looks like it could have helped a lot!

 

[bloody_mary]

why did u use both da formulas in da question??

because one tube was closed while the other is open and they said find ratio

 

[MysteRyGiRl]

because one tube was closed while the other is open and they said find ratio

oki thnx =)

 

[Casablanca]

3000 rev in 1 minute
so in 1 sec = (3000/60) =50
50 rev per second now this is the frequency
so period is 1/50 which is 0.02
so 1 wavelength takes 0.02s so to get a good shape 0.01 should be used to show have the wave as well so answer is B

Thanks. I understood up until the part where you find the period, but beyond that, I don't see how you got 0.01, and thus 10mscm^-1. Could you please elaborate on the last point?

Sorry for being a bother.

 

[Soldier313]

we r nt goin 2 re-arrange the forces

but how can A be a couple???

 

[MysteRyGiRl]

http://www.xtremepapers.com/papers/...nd AS Level/Physics (9702)/9702_w09_qp_12.pdf
i need help here plzzzzzz
in Q no 11,12,13,20,22,25....

 

[Jaf]

can anyone explain galvanometer experiment to find voltage of a cell thankuuu

THIS ONE : http://ualr.edu/dcwold/phys2122/p23man/p23pot1.jpg

If you can understand from the notes someone posted, that's good but if you can't, I'd suggest you check this video:

It's quite the best I have found on potentiometers, a subject on which you don't find much good stuff on the internet. I really found it helpful so try it.

 

[bloody_mary]

Thanks. I understood up until the part where you find the period, but beyond that, I don't see how you got 0.01, and thus 10mscm^-1. Could you please elaborate on the last point?

Sorry for being a bother.

frequency = 1/T

and definition of frequency is how many cycles per second and we got 50revolutions per second so i found the time period which is 0.02 so 1 wavelength takes 0.02s to complete so i we use 0.01 we can see half the wave

 

[bloody_mary]

we r nt goin 2 re-arrange the forces

:S y not