Total mark — 25

### 2019 SQA Higher Physics MCQS With Answers

1. The graph shows how the speed v of a car varies with time t. The average speed of the car during the 12·0 s is

• A 1·25 m s-1
• B 2·08 m s-1
• C 2·50 m s-1
• D 7·50 m s-1
• E 12·5 m s-1.

Ans E

2. A stone is thrown at 50° to the horizontal with a speed of 15 m s-1. Which row in the table gives the horizontal component and the vertical component of the
initial velocity of the stone?

Horizontal component (m s-1)                                       Vertical component (m s-1)

• A                                      15 sin 50                                                                                15 cos 50
• B                                  15 cos 50                                                                                      15 sin 50
• C                                 15 cos 50                                                                                      15 sin 40
• D                                15 cos 40                                                                                      15 sin 50
• E                               15 sin 50                                                                                          15 cos 40

Ans B

3. A golfer strikes a golf ball, which then moves off at an angle to the ground. The ball follows
the path shown. The graphs show how the horizontal component of the velocity vh and the vertical
component of the velocity vv of the ball vary with time t. The speed of the ball just before it hits the ground is

• A 10 m s-1
• B 30 m s-1
• C 40 m s-1
• D 50 m s-1
• E 70 m s-1.

Ans D

4. A car accelerates from rest along a straight level road.
The acceleration of the car is constant.
Which pair of displacement-time (s-t) and acceleration-time (a-t) graphs represent the
motion of the car? Ans A

5. Four masses on a horizontal, frictionless surface are linked together by strings P, Q and R.
A constant force is applied as shown. The tension in the strings is

• A greatest in P and least in Q
• B greatest in P and least in R
• C greatest in R and least in Q
• D greatest in R and least in P
• E the same in P, Q and R.

Ans B

6. A student makes the following statements about an elastic collision.
I Total momentum is conserved.
II Total kinetic energy is conserved.
III Total energy is conserved.
Which of these statements is/are correct?

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

Ans E

7. The terminal velocity vt
of a skydiver is given by the relationship where
m is the mass of the skydiver in kg
g is the gravitational field strength in Nkg-1
Cd is the drag coefficient
ρ is the density of air in kg m-3
A is the area of the skydiver in m2.
When in freefall, a skydiver of mass 95 kg has a drag coefficient of 1∙0 and a terminal velocity
of 44 m s-1.
The gravitational field strength is 9∙8N kg-1
and the density of air is 1∙21 kg m-3.
The area of the skydiver is

• A 0∙59 m2
• B 0∙79 m2
• C 0∙89 m2
• D 4∙2 m2
• E 35 m2.

Ans B

8. A spacecraft is travelling at a constant speed relative to a nearby planet.
A technician on the spacecraft measures the length of the spacecraft as 275 m.
An observer on the planet measures the length of the spacecraft as 125 m.
The speed of the spacecraft relative to the observer on the nearby planet is

• A 1·54 × 104 m s-1
• B 2·22 × 108 m s-1
• C 2·67 × 108 m s-1
• D 3·00 × 108 m s-1
• E 7·14 × 1016 m s-1

Ans C

9. The redshift of a distant galaxy is 0·014.
According to Hubble’s law, the distance of the galaxy from Earth is

• A 9·66 × 10-12 m
• B 1·83 × 1024 m
• C 1·30 × 1026 m
• D 9·32 × 1027 m
• E 6·33 × 1039 m.

Ans B

10. A student makes the following statements about the Universe.
I The force due to gravity acts against the expansion of the Universe.
II Measurements show the rate of expansion of the Universe is increasing.
III The mass of a galaxy can be estimated by the orbital speed of the stars within the
galaxy.
Which of these statements is/are correct?

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

Ans E

11. An alpha particle is accelerated in an electric field between metal plates P and Q. The charge on the alpha particle is 3·2 × 10-19 C.
The kinetic energy gained by the alpha particle while travelling from plate P to plate Q is
8·0 × 10-16 J.
The potential difference across plates P and Q is

• A 2·6 × 10-34 V
• B 2·0 × 10-4 V
• C 4·0 × 10-4 V
• D 2·5 × 103 V
• E 5·0 × 103 V.

Ans B

12. An electron enters a region of uniform magnetic field as shown. The direction of the magnetic force on the electron immediately after entering the field is

• A towards the top of the page
• B towards the bottom of the page
• C towards the right of the page
• D into the page
• E out of the page.

Ans A

13. A student makes the following statements about the Standard Model.
I Every particle has an antiparticle.
II Alpha decay is evidence for the existence of the neutrino.
III The W-boson is associated with the strong nuclear force.
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 A

14. A nucleus represented by 223
87 Fr decays by beta emission.
The symbol representing the nucleus formed as a result of this decay is

• A 22487 Fr
• B 22287 Fr
• C 22388Ra
• D 22386Rn
• E 22488Ra.

Ans C

15. The diagram shows an experiment set up to investigate the photoelectric effect.
The frequency of the incident radiation is varied and the current in the circuit is measured. Which graph shows the relationship between the current I in the circuit and the frequency Ans E

16. A photon of energy 6·40 × 10−19 J is incident on a metal plate.
This causes photoemission to take place.
The work function of the metal is 4·20 × 10−19 J.
The maximum speed of the photoelectron is

• A 1·19 × 106 m s−1
• B 9·60 × 105 m s−1
• C 6·95 × 105 m s−1
• D 6·79 × 105 m s−1
• E 4·91 × 105 m s−1.

Ans C

17. Waves from two coherent sources, S1 and S2, produce an interference pattern.
Maxima are detected at the positions shown. The wavelength of the waves is 28 mm.
For the third minimum at P the path difference (S2P – S1P) is

• A 42 mm
• B 56 mm
• C 70 mm
• D 84 mm
• E 98 mm.

Ans C

18. A ray of monochromatic light passes from air into water.
The wavelength of this light in air is 589 nm.
The speed of this light in water is

• A 2·56 × 102 m s−1
• B 4·52 × 102 m s−1
• C 2·26 × 108 m s−1
• D 3·00 × 108 m s−1
• E 3·99 × 108 m s−1.

Ans C

19. When light passes through the outer layers of the Sun certain frequencies of light are
absorbed by hydrogen atoms, producing dark lines in the spectrum.
The diagram represents some of the energy levels for a hydrogen atom. The number of absorption lines in the spectrum caused by the transition of electrons
between these energy levels is

• A 4
• B 6
• C 9
• D 10
• E 20.

Ans D

20. The output from an AC power supply is connected to an oscilloscope. The trace seen on the
oscilloscope screen is shown. The Y-gain setting on the oscilloscope is 1·0 V/div.
The rms voltage of the power supply is

• A 2·1 V
• B 3·0 V
• C 4·0 V
• D 4·2 V
• E 6·0 V.

Ans A

21. The output from a signal generator is connected to an oscilloscope. The trace observed on
the oscilloscope screen is as shown in the diagram. The frequency of the signal from the signal generator is now doubled.
The amplitude of the signal is unchanged.
The Y-gain setting on the oscilloscope is unchanged.
The timebase setting on the oscilloscope is changed from 1·0 ms/division to 0∙5 ms/division.
Which of the following diagrams shows the trace that is now observed on the oscilloscope
screen? Ans B

22. A student sets up a circuit and measures the voltage across and the current in a resistor.
The measurements and their uncertainties are
voltage = (10∙0 ± 0∙1) V
current = (0∙50 ± 0∙01) A
The approximate absolute uncertainty in the calculated value of the resistance of the
resistor is

• A ±0·11 Ω
• B ±0·2 Ω
• C ±0·4 Ω
• D ±1 Ω
• E ±2 Ω.

Ans C

23. A circuit is set up as shown. The power supply has negligible internal resistance.
The power dissipated in the 3∙0 Ω resistor is

• A 3∙0 W
• B 6∙0 W
• C 9∙0 W
• D 12 W
• E 18 W.

Ans D

24. A student connects four identical light emitting diodes (LEDs) to a 2 V DC supply as shown. Which of the LEDs P, Q, R, and S will light?

• A P only
• B Q only
• C P and Q only
• D P and R only
• E Q and S only.

Ans B

25. A student makes the following statements about uncertainties.
I All measurements of physical quantities are liable to uncertainties.
II Random uncertainties occur when a measurement is repeated and slight variations
occur.
III Systematic uncertainties in a quantity occur when measurements are either all smaller
or all larger than the true value of the quantity.
Which of these statements is/are correct?

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

Ans E