AS Physics P1 MCQs Preparation Thread.

[Oliveme]

Q16)

Take moments about the point X on the wall. You know that the weight lies in the middle, so if you assume the distance XY to be 1m (or 'x' m or whatever you want), the weight would be 0.5m from X. And the anti-clockwise moment, F is given by F sin 30 and it is 1m from X. So form an equation and solve:

F sin 30 * 1 = 0.5 * 10
F = 10.0 N

Q17) ..This one is kind of tricky, I think. I'm not sure if my method is correct. Check out the attachment. I basically found the angle between the strings Y and Z and then resolved forces to find the component 'x'. I did 4 cos 53.1 and then multiplied by 2 because there is a force acting both upwards and downwards. It turns out I got the right answer, but again, don't know if this is the proper method.

Q31) It can't be A because a +ve particle is going away from the +ve charge in the centre, so the repulsive force is decreasing.
It can definitely be B because that's basically the opposite of what I said above.
It can't be C or D because the force in an electric field is the same. In D, the +ve particle will experience the same force at any point. So the answer should be B.

Thank you so very much!

 

[leosco1995]

thank you and Q 25 please!!

(1/N) sin θ = nλ
(sin θ) / λ = Nn

So the gradient is Nn.

 

[SalamH]

ppl pleez explain d followin
12/o/n/09-Q5,Q16,Q25
01/M/J/03-Q6,Q10,Q20,Q23,Q40

 

[thunderingthunder]

(1/N) sin θ = nλ
(sin θ) / λ = Nn

So the gradient is Nn.

Thank you
Please could you help me out with Q18?When ice melts,the intermolecular forces weaken hence the atoms move apart from each other and this also causes a decrease in the density..then why is the answer B?
http://www.xtremepapers.com/papers/...nd AS Level/Physics (9702)/9702_s10_qp_11.pdf

 

[Knight]

ok i know may mistake now..i was confused between A and C, but pls post the question again cause i lost it

 

[Oliveme]

questions 10, 15, 23, 26, 37 and 38. thank you very much.
http://www.xtremepapers.com/papers/...nd AS Level/Physics (9702)/9702_w11_qp_12.pdf

 

[Silent Hunter]

http://www.xtremepapers.com/papers/...and AS Level/Physics (9702)/9702_w07_qp_1.pdf

Questions: 6, in 18 why did we minus the pressure to find the depth? am confused here
23,36

Thank You

 

[Ahmed Ali Akbar]

View attachment 11889

Help plz.......

yar...make vector parallelogram and find the resultant force you will get the right answer...use lengths to find angles..and then use cosine rule to find resultant in the direction of .P. shown on diagram..hope it will help u..

 

[Hassi123]

http://www.xtremepapers.com/papers/...and AS Level/Physics (9702)/9702_w06_qp_1.pdf
Q21 The answer is D, please explain?

 

[Hassi123]

View attachment 11932

The answer would be C, because the angle with the tension is 53.1(tan rule, tan inv= 80/30), and the horizontal force would be 4cos 53.1 making it 2.4, but see there are two tensions with the same angle (XY and XZ) so the total force would be 2.4 x 2 =4.8 (they are the same because same tension and same angle)

 

[Parfals]

I posted the solutions of all June 2002 questions in the other thread.
http://www.xtremepapers.com/community/posts/317510

Kind of rushed it so some answers might not be clear, but it should help anyway.

Thnx a lot ))

 

[umarashraf]

still so many days are left for the pap... why u all are studying now..???

 

[xyz!]

guys can v discuss O/N/11 pls? m having many doubts is this paper... Q2, Q7, Q18, Q23, Q26, Q31, Q32, Q33 AND Q37
pls post explanations/ solutions for the following questions...
here' s the link- http://www.xtremepapers.com/papers/...nd AS Level/Physics (9702)/9702_w11_qp_11.pdf

 

[Paparazzi478]

A laser emits light of wavelength 600 nm.
What is the distance, expressed as a number of wavelengths, travelled by the light in one
second?
A 5 × 108 B 5 × 1011 C 5 × 1014 D 5 × 1017

http://www.xtremepapers.com/papers/...and AS Level/Physics (9702)/9702_w08_qp_1.pdf

the answer is C
can you tell me how?

 

[xyz!]

A laser emits light of wavelength 600 nm.
What is the distance, expressed as a number of wavelengths, travelled by the light in one
second?
A 5 × 108 B 5 × 1011 C 5 × 1014 D 5 × 1017

http://www.xtremepapers.com/papers/CIE/Cambridge International A and AS Level/Physics (9702)/9702_w08_qp_1.pdf

the answer is C
can you tell me how?

They have asked for no. of wavelengths per unit tym...so basically u hav to calculate the frequency
so dat is speed/wavelength
= (3*10^8)/(600*10^-9)
=5*10^14 ==> C

 

[xyz!]

View attachment 11932

what is the answr for this question...as in the markscheme? n vic year is this btw?

 

[iKhaled]

need help in may june 2004

http://www.xtremepapers.com/papers/...and AS Level/Physics (9702)/9702_s04_qp_1.pdf
Q9
Q23
Q25
Q26

 

[geek101]

need help in may june 2004

http://www.xtremepapers.com/papers/CIE/Cambridge International A and AS Level/Physics (9702)/9702_s04_qp_1.pdf
Q9
Q23
Q25
Q26

Q9 - this question we are supposed to use projectiles...
use v^2 = u^2 + 2as for each of the s values and add em up, you get 19...and the closest answer is 20 so D it is.

Q23- diameter = 1 mm
so radius = 0.5 mm >> 5 x 10^-4 m
and area = pi r^2 therefore the cross sectional area of the wire is 7.85 x 10^-7 m square
now take the highest value of F for each range and calculate the stress for each value. If the stress calculated is more than the one mentioned, the wire snaps and you get your answer! which is C becuz 2000 N gives you a stress of 2.5 x 10^8

Q25 - k here, because the wave is moving you have to draw the wave obtained after some time, when you draw the wave you will see that P is going down the only option which says so is A....the answer!

Q26 - okky im not sure about this though, i linked it to the equation intensity = power/time. When the amplitude doubles the intensity increases by 4 and so power which is also teh value E here, increases by 4 so now its 4E. Now keeping the intensity constant, you are reducing S or area by 1/2 so the E has to be halfed too to keep the intensity the same, so it becomes 0.5E. 4E x 0.5E = 2E
and the answer is B.

 

[Paparazzi478]

http://www.xtremepapers.com/papers/...and AS Level/Physics (9702)/9702_s09_qp_1.pdf
Question 10 need explanation.

 

[Silent Hunter]

http://www.xtremepapers.com/papers/CIE/Cambridge International A and AS Level/Physics (9702)/9702_w07_qp_1.pdf

Questions: 6, in 18 why did we minus the pressure to find the depth? am confused here
23,36

Thank You