• 9702 March 2018 Paper 12 Worked Solutions | A-Level Physics

1 B                  11 A                21 D                31 D

2 B                  12 A                22 A                32 C

3 D                  13 C                23 C                33 D

4 B                  14 C                24 C                34 A

5 B                  15 C                25 B                35 A

6 B                  16 C                26 D                36 C

7 B                  17 A                27 C                37 D

8 A                  18 B                28 D                38 C

9 C                  19 A                29 B                39 D

10 C                20 C                30 D                40 B



Notes:


3 - Ans: D.
Two forces of equal magnitude are represented by two coplanar vectors. One is directed towards the east and the other is directed towards the north.


4 - Ans: B.
The density of paper is 800 kg m-3. A typical sheet of paper has a width of 210 mm and a length of 300 mm.


5 - Ans: B.
A person calculates the potential difference across a wire by using the measurements shown.


10 - Ans: C.
Steel pellets, each with a mass of 0.60 g, fall vertically onto a horizontal plate at a rate of 100 pellets per minute.


17 - Ans: A.
A small diesel engine uses a volume of 1.5 × 104 cm3 of fuel per hour to produce a useful power output of 40 kW.



21 - Ans: D. See solution 1014 at 211
A wave pulse moves along a stretched rope in the direction shown. Which diagram correctly shows the variation with time t of the displacement s of the particle P in the rope?


22 - Ans: A.
A wave has period T, wavelength λ and amplitude A. The wave is shown on a graph of displacement x against distance d.



37 - Ans: D.
A cell of electromotive force (e.m.f.) E and negligible internal resistance is connected into a circuit, as shown.