AS Physics P1 MCQs Preparation Thread.

[sweetjinnah]

its no . 29 >>>http://papers.xtremepapers.com/CIE/...and AS Level/Physics (9702)/9702_w07_qp_1.pdf

btw help me with no . 17 also > http://papers.xtremepapers.com/CIE/Cambridge International A and AS Level/Physics (9702)/9702_w06_qp_1.pdf
thanks

mcq 29: power are same, so use P=V^2/R
cancel powers nd then (12^2)/6^2 = Rx/Ry u will solve to get 4...
mcq 17: electrical to light is only 7J hence...7/(93+7) * 100= 7 %

 

[sweetjinnah]

http://papers.xtremepapers.com/CIE/Cambridge International A and AS Level/Physics (9702)/9702_w12_qp_11.pdf sorry for bothering u agian plz tell how to do q36.

no probz...okay its like the current thru ammeter is not changed b/c their no changes r done there...nd resistance ov variable resistor increases so p.d across it shud increase hence on the other hand the p.d shud decrease hence C...

 

[salvatore]

I need some help with a few questions.. please explain the solution.

http://papers.xtremepapers.com/CIE/Cambridge International A and AS Level/Physics (9702)/9702_w10_qp_11.pdf
Qn no. 4, 8, 13, 31

The questions I asked look pretty simple.. but I just can't think of what to do.
I'll appreciate your help..

I'm reposting this.. anyone??

 

[IGCSEstudent2012]

A double slit experiment, using light of wavelength 600nm, results in fringes being produced on a ​

screen. The fringe separation is found to be 1.0mm. ​

When the distance between the double slits and the viewing screen is increased by 2.0 m, the ​

fringe separation increases to 3.0mm. ​

What is the separation of the double slits producing the fringes? ​

pls can anyone help?​

9702_w10_qp_12.pdf Q27

anyone???:/

 

[IGCSEstudent2012]

I'm reposting this.. anyone??

im solving those and let u know when im done

 

[h4rriet]

33--> as simple as that! strain increases means length increases increasing resistance as well.. no need to even think about the cross sectional area..
34--> Sorry I am not sure about this. h4rriet please help!
17--> they said 93% is heat while 7% is light... so 93+7=100... answer is simple 7% ((7/100)*100) - I guess, thats how i understood it..

What we're supposed to do in this question is draw tangents to A, B, C & D FROM THE ORIGIN (don't ask why; pretty stupid question, in my opinion) and see which tangent has the largest gradient, i.e. is the steepest. Because 1/R=I/V, so if 1/R is big, R will be small.

 

[Rahma Abdelrahman]

What we're supposed to do in this question is draw tangents to A, B, C & D FROM THE ORIGIN (don't ask why; pretty stupid question, in my opinion) and see which tangent has the largest gradient, i.e. is the steepest. Because 1/R=I/V, so if 1/R is big, R will be small.

Thanks
But I don't get why from the origin

 

[h4rriet]

Thanks
But I don't get why from the origin

I don't get why either! My guess is that because we can't compare lines unless they have a common point. But that's just a guess...

 

[IGCSEstudent2012]

Rahma Abdelrahman http://papers.xtremepapers.com/CIE/Cambridge%20International%20A%20and%20AS%20Level/Physics%20(9702)/9702_s10_qp_11.pdf
QUES 11 PLS

 

[Aries_95]

anyone???:/

Let the distance between the double slit and the screen be 1m initally.
When the distance is increasd BY 2m the NEW distance is 3m.
Using the formula:
Wavelength= (fringe seperationx distance between the double slits)/ distance between the screen and the slits.
Wavelenght=600nm=600x10^-9m.
Fringe seperation= 3mm= 3x10^-3m
Distance between screen and slits= 3m (1+2)
Distance between the double slit=?
Put these values in the formula, the final answer is 6x10^-4m =0.6mm
Hence the answer is B.

 

[Rahma Abdelrahman]

I don't get why either! My guess is that because we can't compare lines unless they have a common point. But that's just a guess...

Never mind

 

[h4rriet]

I'm reposting this.. anyone??

4. Angular deflection decreases. That means points get closer together (so not much deflection is needed).
8. Since it's a velocity/time graph (and not speed/time), the area will be displacement an displacement is a vector. The upper part will be positive displacement and the lower part will be negative displacement.
13. When taking moments about a pivot, make sure you take the PERPENDICULAR distance from the pivot.
31. Find the rate of flow using Q=It. The direction will be from negative to positive; they didn't ask for the conventional current direction, that's why.

 

[Aries_95]

Rahma Abdelrahman http://papers.xtremepapers.com/CIE/Cambridge%20International%20A%20and%20AS%20Level/Physics%20(9702)/9702_s10_qp_11.pdf
QUES 11 PLS

Using the formula W=mg, calculate m first.
Since we have to calculate the acceleartion down the plane, we use the formula F=ma for which the resultant force has to be calculated first (ie component-frictional force)
The value of the resultant force along with the mass obtained eariler are then inserted in the formula above, hence the answer is 3.0ms^-2 ie C.

 

[Rahma Abdelrahman]

Rahma Abdelrahman http://papers.xtremepapers.com/CIE/Cambridge%20International%20A%20and%20AS%20Level/Physics%20(9702)/9702_s10_qp_11.pdf
QUES 11 PLS

This one is pretty simple:
You will use the given weight to find the mass... (20/10 =2kg)
Then use the resultant force and equate it to ma (10-4=2a , solve for a (6/2 = 3 ms-2)

 

[IGCSEstudent2012]

Let the distance between the double slit and the screen be 1m initally.
When the distance is increasd BY 2m the NEW distance is 3m.
Using the formula:
Wavelength= (fringe seperationx distance between the double slits)/ distance between the screen and the slits.
Wavelenght=600nm=600x10^-9m.
Fringe seperation= 3mm= 3x10^-3m
Distance between screen and slits= 3m (1+2)
Distance between the double slit=?
Put these values in the formula, the final answer is 6x10^-4m =0.6mm
Hence the answer is B.

thankyou Aries_95

 

[IGCSEstudent2012]

Using the formula W=mg, calculate m first.
Since we have to calculate the acceleartion down the plane, we use the formula F=ma for which the resultant force has to be calculated first (ie component-frictional force)
The value of the resultant force along with the mass obtained eariler are then inserted in the formula above, hence the answer is 3.0ms^-2 ie C.

thanx!

 

[IGCSEstudent2012]

This one is pretty simple:
You will use the given weight to find the mass... (20/10 =2kg)
Then use the resultant force and equate it to ma (10-4=2a , solve for a (6/2 = 3 ms-2)

thanks!

 

[magnesium]

is there any need of doing very old pastpapers??? 1990's?

 

[Lyfroker]

q# 13, 18, 28 & 33
http://papers.xtremepapers.com/CIE/...and AS Level/Physics (9702)/9702_w04_qp_1.pdf

 

[salvatore]

4. Angular deflection decreases. That means points get closer together (so not much deflection is needed).
8. Since it's a velocity/time graph (and not speed/time), the area will be displacement an displacement is a vector. The upper part will be positive displacement and the lower part will be negative displacement.
13. When taking moments about a pivot, make sure you take the PERPENDICULAR distance from the pivot.
31. Find the rate of flow using Q=It. The direction will be from negative to positive; they didn't ask for the conventional current direction, that's why.

Thank you for your reply..

I haven't understood qn no. 13, could you please show me the working?

For qn no. 31, I found the rate of flow as t = Q/I = (1.6 x 10^-19) / 4.8 = 3.3 x 10^-20. That is not correct right?