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.

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1. What is meant by the term wavefront?

a line joining points along the peak of a wave

a line joining the trough and the peak of a wave

the distance between successive peaks of a wave

the distance between the trough and the peak of a wave

2. Which characteristics describe an image formed in a plane mirror?

Virtual and smaller than the object

Real and larger than the object

Virtual and upright

Real and inverted

3. Which of the following is the unit for frequency?

metre per second

oscillation per second

joule per second

coulomb per second

4. The speed of sound in air, water and steel is different. Which of the following sequence, showing the speed of sound in ascending order, is correct?

speed of sound in air, speed of sound in water, speed of sound in steel

speed of sound in steel, speed of sound in water, speed of sound in air

speed of sound in air, speed of sound in steel, speed of sound in water

speed of sound in water, speed of sound in air, speed of sound in steel

5. Which of the following does not produce a sound wave?

a gun fired in a room with no echoes

a bell ringing under water

a hammer hitting a block of rubber

an explosion in outer space

6. Which row applies to a short-sighted eye viewing a distant object?

	Position of the image	Lens needed for correction
A	Behind the retina	Converging lens
B	Behind the retina	Diverging lens
C	In front of the retina	Converging lens
D	In front of the retina	Diverging lens

C

A

B

D

7. The diagram shows an object O placed 3 cm away from a converging lens of focal length 6 cm.

What type of image is produced?

Virtual, erect and magnified

Virtual, inverted and diminished

Real, inverted and magnified

Real, erect and diminished

8. The air pressure at sea level is 101,325 Pa. At the centre of a rarefaction of a sound wave in air, the pressure is 91,000 Pa. Which is the most likely pressure at the centre of a compression of the same wave?

111,000 Pa

91,000 Pa

101,000 Pa

121,000 Pa

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

Infra-red waves

Sound waves

Microwaves

Light waves

10. The loudness of a sound is determined by its _________.

speed

frequency

wavelength

amplitude

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