• 9702 June 2016 Paper 12 Worked Solutions | A-Level Physics

1 C                  11 D                21 D                31 C

2 C                  12 D                22 A                32 A

3 A                  13 A                23 B                33 B

4 B                  14 D                24 C                34 B

5 D                  15 C                25 C                35 D

6 A                  16 B                26 D                36 B

7 A                  17 A                27 D                37 D

8 A                  18 C                28 C                38 C

9 C                  19 B                29 B                39 B

10 C                20 D                30 C                40 D

2 - Ans: C.

The luminosity L of a star is given by L = 4πr2σT4 where r is the radius of the star,

3 - Ans: A.
The diagram shows two vectors X and Y, drawn to scale. If X = Y – Z, which diagram best represents the vector Z?


4 - Ans: B.
The diagram shows a cathode-ray oscilloscope (c.r.o.) being used to measure the rate of rotation of a flywheel.



12 - Ans: D.
A light rigid rod XY has an object of weight W fixed at one end. The rod is in equilibrium, resting on a roller at Z and a vertical wall at X.



13 - Ans: A.
In a large container in an oil refinery, three oils of different densities are mixed. No chemical activity occurs.


15 - Ans: C.
The density of air on the Earth decreases almost linearly with height from 1.22 kg m-3 at sea level to 0.74 kg m-3 at an altitude of 5000 m.


17 - Ans: A.
A boy on a bicycle starts from rest and rolls down a hill inclined at 30°to the horizontal.



21 - Ans: D.
A metal wire is attached at one end to a fixed point and a load is hung from the other end so that the wire hangs vertically.



25 - Ans: C.

A stationary wave is set up on a stretched string.The diagram shows the string at two instants of time when it has maximum displacement.

30 - Ans: C.
Before a thunderstorm, the hairs on your head sometimes stand on end.



33 - Ans: B.
Two lamps are connected in series to a 250 V power supply. One lamp is rated 240 V, 60 W and the other is rated 10 V, 2.5 W.



35 - Ans: D.
The charge that a fully charged 12 V car battery can supply is 100 kC. The starter motor of the car requires a current of 200 A for an average period of 2.0 s.