AS Physics P1 MCQs Preparation Thread.

[USMAN Sheikh]

Estimate time to complete 100m=10sec
Average speed=100m/10sec=10m/s
Average k.e=1/2(80)(10^2)=4x10^3J
Therefore the answer is B

what if i estimate it 100 secs thts not clear

 

[leosco1995]

im sorry is da answer D bcoz accordin to ur da answr is C but MS its D

I made an arithmetic error (it's hard to do math on the keyboard ), but otherwise I did everything right.

 

[thunderingthunder]

what if i estimate it 100 secs thts not clear

If you estimate 100 sec for 100 m the runner wouldn't probably be an athlete

 

[leosco1995]

what if i estimate it 100 secs thts not clear

Well, the thing is you need to know some reasonable estimates. An athlete can't take 100 seconds to complete a 100m race, that's just being unrealistic.

 

[thunderingthunder]

Well, the thing is you need to know some reasonable estimates. An athlete can't take 100 seconds to complete a 100m race, that's just being unrealistic.

true...the runner wouldn't be athlete if he takes 100 sec to finish 100 m

 

[Hassi123]

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

 

[leosco1995]

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/CIE/Cambridge International A and AS Level/Physics (9702)/9702_s10_qp_11.pdf

Water is actually sort of different from other substances, in that its liquid (water) form is more denser than its solid form (ice). The key words to figure that out in the question are 'when ice contacts..", this means that the atoms get closer together when going into the liquid form, so the spacing between the atoms decreases. And this means that the volume is also lower. Using density = mass / volume, the density gets higher.

Why ice is less denser in water isn't in the syllabus (though I think it is in Chemistry (hydrogen bonding)) so you don't need to worry about that. There's also a few other substances which show this behavior but who really cares about those.

 

[leosco1995]

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

For this type of question, you have to use the liquid pressure formula separately for the oil and water and then add them up to give 17.5 MPa.

For the oil, pressure = 9.81 * 830 * x
For the water, pressure = 9.81 * 1000 * (2000-x)

9.81 * 830 * x + 9.81 * 1000 * (2000-x) = 17.5 * 10^6

Solving this gives ~1270m.

 

[fathimaash]

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

k da pressure is 17500000 pa nd u knw p=hdg (d-density)
for oil da pressure will be p= x*830*g
nd for water its gonna be p= (2000-x)*1000*g
u knw p of oil + p of water = 17500000 pa hence equate p of oil nd p of water to 17500000
17500000 = (830gx) + (1000g(2000-x))
x= 1270m
hope u get it

 

[Peter Check]

Why is the answer D? Should it not be B??? The tensio is the same throughout right so it will be 30N, and hence the torque will be 30 X 0.15=4.5!

 

[Peter Check]

I am getting A for this one? But that not right, why?

 

[thunderingthunder]

Water is actually sort of different from other substances, in that its liquid (water) form is more denser than its solid form (ice). The key words to figure that out in the question are 'when ice contacts..", this means that the atoms get closer together when going into the liquid form, so the spacing between the atoms decreases. And this means that the volume is also lower. Using density = mass / volume, the density gets higher.

Why ice is less denser in water isn't in the syllabus (though I think it is in Chemistry (hydrogen bonding)) so you don't need to worry about that. There's also a few other substances which show this behavior but who really cares about those.

Thank you

 

[fathimaash]

View attachment 11987 I am getting A for this one? But that not right, why?

k u knw ouput / input * 100 = efficency so here it will be 4 * 10^ 6 / input * 100= 80 so u get input = 5 * 10^6 W
so power / voltage = current
5*10^6/ 25000 = 200 A.
i might be wrong if so let me knw but i think dis is how we cn do it.

 

[fathimaash]

pls help me with q21 of 13.O.N.2011

 

[USMAN Sheikh]

q 19 and 37 for 37 i am sure that its B then why its C :S pls help needed

 

[Hassi123]

http://www.xtremepapers.com/papers/...and AS Level/Physics (9702)/9702_s03_qp_1.pdf
and the markscheme http://www.xtremepapers.com/papers/...el/Physics (9702)/9702_s03_ms_1+2+3+4+5+6.pdf
Please help in Q10 AND Q40. Thankyou

 

[Hassi123]

whats the differenve between physical quantities and base units?

 

[jsg]

http://www.xtremepapers.com/papers/...and AS Level/Physics (9702)/9702_w04_qp_1.pdf

Help needed in Q 7... Why the answer is not A?

 

[SalmanslK]

W09 Var 12 Q11 to 14 & Q25.

 

[Hassi123]

Ok my problems in m/j 2007 paper. Hope someone can help me out here,
http://www.xtremepapers.com/papers/...and AS Level/Physics (9702)/9702_s07_qp_1.pdf
Q10) the answer is B, all i dont get is shouldnt it be p2-(-p1) in the numerator, and then becomes p2+p1? why is it p2-p1?
Q13) The answer is B, the only problem i have is, how do we find the perpendicular distance?
Q20) the answer is B, i dont get it completely, whats tension and compression is such scenarios?
Q37) The answer is C, how do they have equal resistances?
PLEASE HELP, I WOULD TRULY APPRECIATE IT, THANKYOU