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

1 C                  11 C                21 D                31 A

2 B                  12 B                22 B                32 A

3 D                  13 A                23 D                33 B

4 D                  14 C                24 A                34 B

5 A                  15 D                25 D                35 A

6 C                  16 B                26 C                36 A

7 C                  17 C                27 D                37 C

8 D                  18 C                28 A                38 C

9 C                  19 B                29 C                39 B

10 D                20 D                30 D                40 B

 


4 - Ans: D.
A student applies a potential difference V of (4.0 ± 0.1) V across a resistor of resistance R of (10.0 ± 0.3) Ω for a time t of (50 ± 1) s.


5 - Ans: A.
The velocity of an object changes with time t as shown. Which graph best shows the variation with time t of the displacement s of the object?


7 - Ans: C.
A sky-diver falls vertically from a helicopter and reaches constant (terminal) velocity.


9 - Ans: C.
An elastic collision occurs between two bodies X and Y. The mass of body X is m and the mass of body Y is 4m.


10 - Ans: D.
The density of water is 1.0 g cm-3 and the density of glycerine is 1.3 g cm-3.


13 - Ans: A.
A uniform diving-board is held by two fixed rods at points P and Q. A person stands at end R of the diving-board, as shown.


18 - Ans: C.
A steel sphere is dropped vertically onto a horizontal metal plate.


19 - Ans: B.
A car of mass 500 kg is at rest at point X on a slope, as shown.


28 - Ans: A.
The diagram shows a stationary wave, at time t = 0, that has been set up on a string fixed between points P and S.


29 - Ans: C.
A two-source interference experiment uses the apparatus shown. What is the main purpose of the single slit?



32 - Ans: A.
The power output of an electrical supply is 2.4 kW at a potential difference (p.d.) of 240 V.


34 - Ans: B.
Four different resistors are arranged as shown. A current of 1.5 A enters the network at junction X and leaves through junction Y.



36 - Ans: A.
In the circuits shown, the batteries are identical and all have negligible internal resistance. All of the resistors have the same resistance.