Practice MCQs For Waves, Light, Lens & Sound

This quiz contains practice questions for GCE ‘O’ level topics: General Waves Properties, Reflection and Refraction Of Light, Converging Lens, Electromagnetic spectrum, Sound. There are explanations for some of the questions after you submit the quiz. If you could not figure out why a particular option is the answer, feel free to drop a comment below or ask a question in ‘O’ & ‘A’ Level Discussion section of the forum. If you wish to contribute questions to this quiz, please contact us.

The quiz comprises of 10 questions, which are randomly selected from a large pool of questions. After completion, you can refresh the page and try the quiz again for a new set of 10 questions.

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1. Which statement is correct?

Infra-red waves have a lower frequency than radio waves.

X-rays have a higher speed in air than visible light.

Microwaves have a longer wavelength than visible light.

Gamma rays have a longer wavelength than ultra-violet waves.

2. Three rays of light are incident on the boundary between a glass block and air.

The angles of incidence are different.

What is a possible critical angle for light in the glass?

$30^{\circ}$

$15^{\circ}$

$45^{\circ}$

$60^{\circ}$

3. Which of the following is a possible unit for period of a wave?

hertz

metre per second

second

metre

4. Which of the following are always true for sound waves?

A. Sound waves are produced by vibration.

B. Sound waves are longitudinal waves.

C. Sound waves have an approximate speed of 300 m/s

A and C only

A and B only

A, B and C

B and C only

5. Which type of wave is used to send telephone signals to and from a satellite?

Microwaves

Sound waves

Light waves

Infra-red waves

6. A fish in a pond looks up at a man standing beside the pond. To the fish, the man appears _________.

Smaller and nearer than he is actually is.

Larger and further than he actually is.

Smaller and further than he actually is.

Larger and nearer than he actually is.

7. What is meant by the term wavefront?

the distance between the trough and the peak of a wave

a line joining the trough and the peak of a wave

a line joining points along the peak of a wave

the distance between successive peaks of a wave

8. The diagram shows a water wave in a ripple tank.

The wave has a speed of 12 cm/s at R.

The wave crosses a boundary PQ where the distance between crests changes from 3.0 cm to 1.5 cm.

What is the velocity of the wave at point S?

24 cm/s

6.0 cm/s

12 cm/s

3.0 cm/s

9. Which of the following is the speed of a transverse wave?

$\frac{\text{wavelength}}{\text{Time taken for a wave to travel from one point to another}}$

The speed of the compression

The speed of the crest

The speed of a particle on the wave

10. A star explodes in outer space.

Which waves from the exploding star do not reach the Earth?

Sound

Radio

Infra-red

Light

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