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. 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?

Real, erect and diminished

Virtual, erect and magnified

Virtual, inverted and diminished

Real, inverted and magnified

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

hertz

metre per second

second

metre

3. Which of the following are the properties of a plane mirror image?

A. The image is the same size as the object.

B. The image is virtual.

C. The image is inverted.

A only

A, B and C

A and B only

A and C only

4. A flash of lightning and the corresponding thunder clap are detected 6 s apart. It is calculated that the lightning struck about 1800 m away.

On which assumption is the calculation based?

Light reaches us almost instantaneously, but sound travels at $300 \text{ ms}^{-1}$

Sound reaches us almost instantaneously, but light travels at $300 \text{ ms}^{-1}$

Light travels $300 \text{ ms}^{-1}$ faster than sound

The sound of the thunder was emitted 6 s after the flash

5. A lens forms a blurred image of an object on a screen.

How can the image be made sharp and in focus on the screen?

by using a brighter object at the same position

by using a lens of longer focal length at the same position

by moving the screen away from the lens and the object

by moving the object away from the lens and screen

6. Water waves refract at a boundary between deep water and shallow water.

What is the effect on the frequency, wavelength and speed of the waves at the boundary?

	Frequency	Wavelength	Speed
A	Changes	Changes	Stays the same
B	Changes	Stays the same	Stays the same
C	Stays the same	Changes	Changes
D	Stays the same	Stays the same	Changes

B

C

D

A

7. We can hear sound when a ball strikes the floor because ___________.

the air particles from the floor flowed into our ears.

the air particles from the floor vibrate and produce transverse waves to flow through the air into our ears.

the air particles from the floor vibrate and produce longitudinal waves to flow through the air into our ears.

the wavelength of the sound wave is large enough to produce the sound.

8. Which of the following is/are longitudinal wave(s)?

A. The sound produced by a bat

B. The light from the Sun

C. The ripples on the surface of the water

A and C only

A and B only

A only

B and C only

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

joule per second

coulomb per second

oscillation per second

metre per second

10. Which of the following is a possible unit for amplitude of a wave?

metre per second

hertz

metre

second

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