• 9702 June 2015 Paper 12 Worked Solutions | A-Level Physics

1 C                  11 D                21 A                31 C

2 D                  12 C                22 B                32 A

3 C                  13 A                23 C                33 A

4 C                  14 B                24 C                34 D

5 D                  15 C                25 B                35 A

6 C                  16 D                26 C                36 B

7 D                  17 D                27 B                37 A

8 D                  18 D                28 B                38 A

9 C                  19 A                29 B                39 C

10 C                20 B                30 B                40 C

Notes for specific questions:

4 - Ans: C.

The arrow represents the vector R. Which diagram does not represent R as two perpendicular components?

5 - Ans: D. See solution 972 at
A power supply of electromotive force (e.m.f.)50 V and negligible internal resistance is connected in series with resistors of resistance 100 Ω and 5 Ω, as shown.



6 - Ans: C. See solution 1068 at
A single sheet of aluminium foil is folded twice to produce a stack of four sheets. The total thickness of the stack of sheets is measured to be (0.80 ± 0.02) mm.


9 - Ans: C.

A sprinter runs a 100m race in a straight line. He accelerates from the starting block at a constant acceleration of 2.5 m s-2 to reach his maximum speed of 10 m s-1. He maintains this speed until he crosses the finish line.

10 - Ans: C.
A firework rocket is fired vertically upwards. The fuel burns and produces a constant upwards force on the rocket.


12 - Ans: C.

An astronaut throws a stone with a horizontal velocity near to the Moon’s surface. Which row describes the horizontal and vertical forces acting on the stone after release?

14 - Ans: B. See solution 974 at
A ladder is positioned on icy (frictionless) ground and is leant against a rough wall. At the instant of release it begins to slide.


15 - Ans: C.
A uniform solid block has weight 500 N, width 0.4 m and height 0.6 m. The block rests on the edge of a step of depth 0.8 m, as shown.


16 - Ans: D. See solution 977 at
The diagram shows a hydroelectric power station.  The reservoir is linked to the turbines by a pipe of uniform cross-sectional area.


20 - Ans: B.
The maximum pressure that granite rock can withstand is 2.0 × 108 N m-2. Above this pressure, the rock begins to flow like a liquid.


23 - Ans: C. See solution 1069 at
The diagram represents a steel tube with wall thickness w which is small in comparison with the diameter of the tube.



24 - Ans: C. See solution 1063 at

Two light waves of the same frequency are represented by the diagram.

25 - Ans: B.
What is a possible distance between two points on the wave that have a phase difference of 60°?


27 - Ans: B.
Source S emits microwaves with a constant amplitude. The microwaves hit a metal screen P and are reflected.


30 - Ans: B.
A charged oil drop of mass m, with n excess electrons, is held stationary in the uniform electric field between two horizontal plates separated by a distance d.


35 - Ans: A. See solution 1111 at
Each of Kirchhoff's two laws presumes that some quantity is conserved.



36 - Ans: B. See solution 1118 at
A potential divider circuit consists of fixed resistors of resistance 2.0 Ω and 4.0 Ω connected in series with a 3.0 Ω resistor fitted with a sliding contact.



39 - Ans: C.
A radioactive substance contains a number of identical nuclei that emit β-particles. Which property of these nuclei remains unaltered by the emission?