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 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

3.0 cm/s

12 cm/s

6.0 cm/s

2. Which statement is correct?

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

Microwaves have a longer wavelength than visible light.

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

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

3. 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, inverted and diminished

Virtual, erect and magnified

Real, erect and diminished

Real, inverted and magnified

4. Which option shows parts of the electromagnetic spectrum in order of increasing frequency?

X-rays, visible light, radio waves

X-rays, radio waves, visible light

radio waves, X-rays, visible light

radio waves, visible light, X-rays

5. 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, B and C

A and B only

B and C only

6. The period of a wave is _____________.

the frequency of the wave multiply by the wavelength of the wave.

the time taken for the wave to travel from one point to another.

the time taken for the wave to complete one oscillation.

the distance divided by the speed of the wave.

7. 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

B

A

D

C

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 only

B and C only

A and B only

A and C only

9. A star explodes in outer space.

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

Infra-red

Light

Sound

Radio

10. The distance between a compression and rarefaction in a sound wave is 0.15 m. The period of the sound wave is 0.20 milliseconds. The speed of the sound is ___________.

1500 m/s

3300 m/s

750 m/s

330 m/s

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