AS Physics P1 MCQs Preparation Thread.

[omg]

can any1 explain q.16 .
y is it C nt D????

 

[Nibz]

http://www.xtremepapers.com/papers/CIE/Cambridge International A and AS Level/Physics (9702)/9702_w10_qp_12.pdf
q 26... help me!

2 nodes are 15 mm apart. Wavelength = 15 x 2 = 30 mm
Speed = 3 x 10 ^8
f = (3 x 10^8) / 30 x 10^-3
= 1 x 10^10
1 Giga = 10^9
So it's 10 GHz

 

[Nibz]

can any1 explain q.16 .
y is it C nt D????

Since the temperature is given, which is same for both ice and water, their mean 'kinetic energies' are same.
You need more data to know if the last option is correct or not, which is not in the question.

 

[omg]

Since the temperature is given, which is same for both ice and water, their mean 'kinetic energies' are same.
You need more data to know if the last option is correct or not, which is not in the question.

thanks ^^

 

[biba]

u r suppose to know the wavelength range of all the waves from which
u find frequency

can u plz just solve it?

 

[biba]

2 nodes are 15 mm apart. Wavelength = 15 x 2 = 30 mm
Speed = 3 x 10 ^8
f = (3 x 10^8) / 30 x 10^-3
= 1 x 10^10
1 Giga = 10^9
So it's 10 GHz

umm y did u multiply 15mm by 2?

 

[omg]

PLS TEL HOW TO DO OCT 2003 MCQ 30

dats pretty simple
first find the charge, Q=It
Q=2 x (60x60)
Q=7200C
now divide it by 1.6 x 10^-19 to get the no. of electrons

 

[Haniya Khan]

thankuu

 

[kinglynx]

Q10.

mu1 - mu2 = (m+m)v
60m - 40m = 2mv
20m/2m = v
10 = v


Q11.
Net force = m x a
10 - 4 = 2a
6/2 = a
3 = a

Q24.
f = v/lambda => wavelength and frequency have an inverse proportionality. Increasing f would decrease the wavelength.
With shorter wavelength, diffraction is less pronounced, i.e more closer to diagram 2.

Q31.
R = ρL/A
R . A /L = ρ
Ω m^2 /m = ρ
Ω m = ρ

Wrong paper sorry, heres the one i needed AND PLEASE EXPLAIN, calculations only help slightly, i need a description of why you did what you did... and answer these questions:

Okay, here it is again :
Questions: 10, 11 , 21, 24, 26, 27, 31, 33 ,36

 

[kinglynx]

SORRRY ONCE AGAIN! Please help! :'(

 

[hmlahori]

Please people do help i've posted these questions several times but no replies . If someone can explain any one of the questions if not all please do. Thanks.

http://www.xtremepapers.com/papers/...and AS Level/Physics (9702)/9702_w04_qp_1.pdf
http://www.xtremepapers.com/papers/...A and AS Level/Physics (9702)/9702_w04_er.pdf
Please can someone explain Q18 i get B but answer is A. and Q20 and for Q 33 i get B 2I but correct answer is C 4I. How?

http://www.xtremepapers.com/papers/...nd AS Level/Physics (9702)/9702_w11_qp_11.pdf
http://www.xtremepapers.com/papers/...nd AS Level/Physics (9702)/9702_w11_ms_11.pdf
Q10 Why cant answer be A?
Q18,26,28???
Q29 How is a stationary wave formed in Q since both ends are open?
Q30??
Q33 Why cant answer be C?
Q36???

 

[waleedsmz]

2 nodes are 15 mm apart. Wavelength = 15 x 2 = 30 mm

Speed = 3 x 10 ^8
f = (3 x 10^8) / 30 x 10^-3
= 1 x 10^10
1 Giga = 10^9
So it's 10 GHz

Umm... I think the wavelength is actually 15/2 not 15 x 2 since you have 5 nodes ( 2 wavelengths )...

 

[Nibz]

umm y did u multiply 15mm by 2?

Because wavelength is twice the distance b/w two successive nodes.

 

[Nibz]

Umm... I think the wavelength is actually 15/2 not 15 x 2 since you have 5 nodes ( 2 wavelengths )...

That's wrong. Each point is 15 mm apart, the whole distance is not 15 mm.
Because with that, you get 40 GHz which is not even an option.

 

[bloody_mary]

thhhaaat actually helped! thank you soo soo much! God bless u sis!

welcome

 

[omg]

and can u tell mcq 11 of same year???

momentum before the collision =mu
after the collison =-mu
so change in momentum = mu-(-mu) => 2mu

 

[Nibz]

Wrong paper sorry, heres the one i needed AND PLEASE EXPLAIN, calculations only help slightly, i need a description of why you did what you did... and answer these questions:

Okay, here it is again :
Questions: 10, 11 , 21, 24, 26, 27, 31, 33 ,36

You wasted my time with a wrong paper. I'm not solving your questions anymore.

 

[biba]

umm y did u multiply 15mm by 2?

oh i got it!!! thank u so0o0o0o0o0 verrry much for the help!

 

[bloody_mary]

Wrong paper sorry, heres the one i needed AND PLEASE EXPLAIN, calculations only help slightly, i need a description of why you did what you did... and answer these questions:

Okay, here it is again :
Questions: 10, 11 , 21, 24, 26, 27, 31, 33 ,36

honestly get your stuff togther and post the right paper

10
momentum before = momentum after
so mv + m*0 = mv
total momentum = mv = 2mv'
v'=v/2

KE = 0.5mv^2 so 0.5 * 2m * (0.5v)^2 =0.25mv^2 so answer is A

11
resultant torque is non zero as you have 2 3oN forces
rersultant force is non zero as 2 20N forces are pulling it

21
answer is B because after T the material undergoes plastic deformation
24
at constant temp speed of air is constant so F is inversely proportional to wavelength

26 and 27
[no idea]

31
answer is A you need to learn definition of EMF

33
power is I^2R so proportional
and when you have 2 resistors in parallel the total resistance is less than individual resistance of each one so a higher resistance means more power across it and less across other components

36
voltage across R1 is X and R2 is L-x so answer is D

 

[omg]

q.12!
pleasee