SECTION 1 — 20 marks
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2017 SQA Higher Physics MCQS With Answers

1. The graph shows how the velocity of an object varies with time.

The acceleration of the object is

• A 0·83 m s−2
• B 1·2 m s−2
• C 2·5 m s−2
• D 5·0 m s−2
• E 6·0 m s−2

Ans A

2. A block is resting on a horizontal surface.
A force of 24N is now applied as shown and the block slides along the surface.

The mass of the block is 20 kg.
The acceleration of the block is 0·20 m s−2.
The force of friction acting on the block is

• A 4·0N
• B 8·0N
• C 12 N
• D 16 N
• E 25 N.

Ans B

3. The graph shows how the vertical speed of a skydiver varies with time.

A student uses information from the graph to make the following statements.
I  The acceleration of the skydiver is greatest between P and Q.
II The air resistance acting on the skydiver between Q and R is less than the weight of the
skydiver.
III  The forces acting on the skydiver are balanced 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 , II and III

Ans C

4. A spacecraft is travelling at a constant speed of 2·75 × 108 m s−1relative to a planet.
A technician on the spacecraft measures the length of the spacecraft as 125 m.
An observer on the planet measures the length of the spacecraft as

• A 36 m
• B 50 m
• C 124 m
• D 314 m
• E 433 m.

Ans B
5. A galaxy has a recessional velocity of 0·30c.

Hubble’s Law predicts that the distance between Earth and this galaxy is

• A 1·3 × 1017 m
• B 3·9 × 1025 m
• C 1·3 × 1026 m
• D 1·4 × 1041 m
• E 4·5 × 1042 m.

Ans B

6. Measurements of the expansion rate of the Universe lead to the conclusion that the rate of
expansion is increasing.Present theory proposes that this is due to

• A redshift
• B dark matter
• C dark energy
• D the gravitational force
• E cosmic microwave background radiation.

Ans C

7. A student makes the following statements about the radiation emitted by stellar objects.
I Stellar objects emit radiation over a wide range of frequencies.
II The peak wavelength of radiation is longer for hotter objects than for cooler objects.
III At all frequencies, hotter objects emit more radiation per unit surface area per unit
time than cooler objects.
Which of these statements is/are correct?

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

Ans D

8. The following statement represents a nuclear reaction.

Ans A

9. Radiation is incident on a clean zinc plate causing photoelectrons to be emitted.
The source of radiation is replaced with one emitting radiation of a higher frequency.
Which row in the table shows the effect of this change on the maximum kinetic energy of a
photoelectron and the number of photoelectrons emitted per second?

Ans D

10. Ultraviolet radiation of frequency 7·70 × 1014 Hz is incident on the surface of a metal.
Photoelectrons are emitted from the surface of the metal.
The maximum kinetic energy of an emitted photoelectron is 2·67 × 10−19 J.
The work function of the metal is

• A 1·07 × 10−19 J
• B 2·44 × 10−19 J
• C 2·67 × 10−19 J
• D 5·11 × 10−19 J
• E 7·78 × 10−19 J.

Ans B

11. A student makes the following statements about waves from coherent sources.
I Waves from coherent sources have the same velocity.
II Waves from coherent sources have the same wavelength.
III Waves from coherent sources have a constant phase relationship.
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

12. A ray of red light passes from a liquid to a transparent solid.
The solid and the liquid have the same refractive index for this light.
Which row in the table shows what happens to the speed and wavelength of the light as it
passes from the liquid into the solid?

Ans E

13. A ray of blue light passes from air into a transparent block as shown.

The speed of this light in the block is

• A 1·80 × 108 m s−1
• B 1·96 × 108 m s−1
• C 2·00 × 108 m s−1
• D 2·23 × 108 m s−1
• E 2·65 × 108 m s−1

Ans D

14. A student carries out an experiment to investigate how irradiance varies with distance.
A small lamp is placed at a distance d away from a light meter. The irradiance I at this
distance is displayed on the meter. This measurement is repeated for a range of different
distances.
The student uses these results to produce the graph shown.

The graph indicates that there is a systematic uncertainty in this experiment.
Which of the following would be most likely to reduce the systematic uncertainty in this
experiment?

• A Repeating the readings and calculating mean values.
• B Replacing the small lamp with a larger lamp.
• C Decreasing the brightness of the lamp.
• D Repeating the experiment in a darkened room.
• E Increasing the range of distances.

Ans D

15. A point source of light is 8·00 m away from a surface. The irradiance, due to the point
source, at the surface is 50·0 mW m−2. The point source is now moved to a distance of
12·0 m from the surface.
The irradiance, due to the point source, at the surface is now

• A 22·2 mW m−2
• B 26·0 mW m−2
• C 33·3 mW m−2
• D 75·0 mW m−2
• E 267 mW m−2

Ans A

16. The output from an a.c. 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 r.m.s. 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

17. A 20 µF capacitor is connected to a 12 V d.c. supply.
The maximum charge stored on the capacitor is

• A 1·4 × 10−3 C
• B 2·4 × 10−4 C
• C 1·4 × 10−4 C
• D 1·7 × 10−6 C
• E 6·0 × 10−7 C.

Ans B

18. A circuit containing a capacitor is set up as shown.

The supply has negligible internal resistance.
The maximum energy stored in the capacitor is

• A 5·4 × 10−4 J
• B 3·5 × 10−4 J
• C 1·4 × 10−4 J
• D 3·4 × 10−5 J
• E 2·2 × 10−5 J.

Ans E

19. A student makes the following statements about conductors, insulators and semiconductors.
I In conductors, the conduction band is completely filled with electrons.
II In insulators, the gap between the valence band and the conduction band is large.
III In semiconductors, increasing the temperature increases the conductivity.
Which of these statements is/are correct?

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

Ans E

20. Astronomers use the following relationship to determine the distance, d, to a star.

For a particular star the following measurements are recorded:
apparent brightness, F = 4·4 × 10−10 W m−2
luminosity, L = 6·1 × 1030 W
Based on this information, the distance to this star is

• A 3·3 × 1019 m
• B 1·5 × 1021 m
• C 3·7 × 1036 m
• D 1·1 × 1039 m
• E 3·9 × 1039 m.

Ans A