### 2018 SQA Higher Physics MCQS With Answers

1. A car is moving at a speed of 2·0 m s−1.
The car now accelerates at 4·0 m s−2
until it reaches a speed of 14 m s−1.
The distance travelled by the car during this acceleration is

• A 1·5 m
• B 18 m
• C 24 m
• D 25 m
• E 48 m.

Ans C

2. A ball is dropped from rest and allowed to bounce several times.
The graph shows how the velocity of the ball varies with time. A student makes the following statements about the ball.
I The ball hits the ground at P.
II The ball is moving upwards between Q and R.
III The ball is moving upwards between R and S.
Which of these statements is/are correct?

• A I only
• B II only
• C III only
• D I and II only
• E I and III only

Ans D

3. A block of mass 6·0 kg and a block of mass 8·0 kg are connected by a string.
A force of 32N is applied to the blocks as shown. A frictional force of 4·0N acts on each block.
The acceleration of the 6·0 kg block is

• A 1·7 m s−2
• B 2·0 m s−2
• C 2·3 m s−2
• D 2·9 m s−2
• E 5·3 m s−2.

Ans A

4. A person stands on a weighing machine in a lift. When the lift is at rest, the reading on the
weighing machine is 700N.
The lift now descends and its speed increases at a constant rate.
The reading on the weighing machine

• A is a constant value higher than 700N
• B is a constant value lower than 700N
• C continually increases from 700N
• D continually decreases from 700N
• E remains constant at 700N.

Ans B

5. Enceladus is a moon of Saturn. The mass of Enceladus is 1·08 × 1020 kg.
The mass of Saturn is 5·68 × 1026 kg.
The gravitational force of attraction between Enceladus and Saturn is 7·24 × 1019N.

• A 2·38 × 108 m
• B 9·11 × 1013 m
• C 5·65 × 1016 m
• D 8·30 × 1027 m
• E 3·19 × 1033 m.

Ans A

6. A spacecraft is travelling at 0·10c relative to a star.
An observer on the spacecraft measures the speed of light emitted by the star to be

• A 0·90c
• B 0·99c
• C 1·00c
• D 1·01c
• E 1·10c.

Ans C

7. A spacecraft is travelling at a speed of 0·200c relative to the Earth.
The spacecraft emits a signal for 20·0 seconds as measured in the frame of reference of the
spacecraft.
An observer on Earth measures the duration of the signal as

• A 19·2 s
• B 19·6 s
• C 20·0 s
• D 20·4 s
• E 20·8 s.

Ans D

8. How many types of quark are there?

• A 8
• B 6
• C 4
• D 3
• E 2

Ans B

9. An electron is a

• A boson
• C baryon
• D meson
• E lepton.

Ans E

10. A proton enters a region of magnetic field as shown. On entering the magnetic field the proton

• A deflects into the page
• B deflects out of the page
• C deflects towards the top of the page
• D deflects towards the bottom of the page
• E is not deflected.

Ans C

11. A nuclear fission reaction is represented by the following statement.
1 235 141 10 92 56 0 n U Ba X 3 n + → ++
The nucleus represented by X is

• A 9640Zr
• B 9236Kr
• C 9740Zr
• D 9336Kr
• E 9440Zr.

Ans B

12. The irradiance on a surface 0·50 m from a point source of light is I.
The irradiance on a surface 1·5 m from this source is

• A 0·11I
• B 0·33I
• C 1·5I
• D 3·0I
• E 9·0I.

Ans A

13. Waves from two coherent sources, S1 and S2, produce an interference pattern. Maxima are
detected at the positions shown below. The path difference S1P − S2P is 154 mm.
The wavelength of the waves is

• A 15·4 mm
• B 25·7 mm
• C 28·0 mm
• D 30·8 mm
• E 34·2 mm.

Ans D

14. A ray of monochromatic light passes from air into a block of glass as shown. The wavelength of this light in air is 6·30 × 10−7 m.
The refractive index of the glass for this light is 1·50.
The frequency of this light in the glass is

• A 2·10 × 10−15 Hz
• B 1·26 × 102 Hz
• C 1·89 × 102 Hz
• D 4·76 × 1014 Hz
• E 7·14 × 1014 Hz.

Ans D

15. A circuit is set up as shown. The battery has negligible internal resistance.
A student makes the following statements about the readings on the meters in this circuit.
I When switch S is open the reading on the voltmeter will be 6·0 V.
II When switch S is open the reading on A2 will be 0·60 A.
III When switch S is closed the reading on A1 will be 0·80 A.
Which of these statements is/are correct?

• A I only
• B II only
• C I and II only
• D II and III only
• E I, II and III

Ans E

16. The power dissipated in a 120Ω resistor is 4·8 W.
The current in the resistor is

• A 0·020 A
• B 0·040 A
• C 0·20 A
• D 5·0 A
• E 25 A.

Ans C

17. A 24·0 μF capacitor is charged until the potential difference across it is 125 V.
The charge stored on the capacitor is

• A 5·21 × 106 C
• B 7·75 × 10−2 C
• C 1·50 × 10−3 C
• D 3·00 × 10−3 C
• E 1·92 × 10−7 C.

Ans D

18. A circuit is set up as shown. When the capacitor is fully charged the energy stored in the capacitor is

• A 1·6 × 10−5 J
• B 1·3 × 10−3 J
• C 2·6 × 10−3 J
• D 1·6 × 10−2 J
• E 1·6 × 104 J.

Ans D

19. The circuit shown is used to charge and then discharge a capacitor C. Which pair of graphs shows how the potential difference V across the capacitor varies with
time t during charging and discharging? Ans E

20. A student carries out an experiment to determine the specific heat capacity c of a solid.
The relationship used to calculate c is The recorded measurements and their percentage uncertainties are shown.
energy supplied, E = 5000 J ± 1%
mass of solid, m = 0·20 kg ± 2%
change in temperature, ∆T = 4·5 °C ± 5%
A good estimate of the percentage uncertainty in the calculated value of c is

• A 8%
• B 7%
• C 5%
• D 3%
• E 1%

Ans C