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 happens to light as it passes from glass into air?

Its wavelength increases because its speed increases.

Its frequency increases because its speed increases.

Its frequency decreases because its speed decreases.

Its wavelength decreases because its speed decreases.

2. The pitch of a sound is determined by its _________.

speed

wavelength

frequency

amplitude

3. What happens to light as it passes from glass into air?

Its frequency decreases because its speed decreases.

Its wavelength decreases because its speed decreases.

Its wavelength increases because its speed increases.

Its frequency increases because its speed increases.

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

a gun fired in a room with no echoes

a bell ringing under water

an explosion in outer space

a hammer hitting a block of rubber

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

amplitude

wavelength

speed

frequency

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

radio waves, X-rays, visible light

radio waves, visible light, X-rays

X-rays, radio waves, visible light

X-rays, visible light, radio waves

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

metre per second

joule per second

oscillation per second

coulomb per second

8. 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

750 m/s

3300 m/s

330 m/s

9. A student stands 50 m from a wall and knocks two wooden blocks together. When the frequency of knocking is 3 knocks per second, the echo of a knock is heard at the instant of the next one.

What is the speed of sound in air?

300 m/s

200 m/s

350 m/s

150 m/s

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

ampere

hertz

meter per second

tesla

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