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?

Virtual, inverted and diminished

Virtual, erect and magnified

Real, inverted and magnified

Real, erect and diminished

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

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

B. The image is upright.

C. The image is laterally inverted.

A, B and C

B and C only

A and B only

A only

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

wavelength

speed

amplitude

frequency

4. Which of the following is/are the properties of electromagnetic waves?

A. All electromagnetic waves have a speed of $3 \times 10^{8} \, \text{m s}^{-1}$ in vacuum.

B. All electromagnetic waves are transverse waves.

C. All electromagnetic waves can be seen by the naked eye.

B only

A, B and C

A and B only

A only

5. 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?

200 m/s

150 m/s

350 m/s

300 m/s

6. 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?

6.0 cm/s

12 cm/s

3.0 cm/s

24 cm/s

7. 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?

91,000 Pa

101,000 Pa

121,000 Pa

111,000 Pa

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

Its frequency decreases because its speed decreases.

Its wavelength increases because its speed increases.

Its wavelength decreases because its speed decreases.

Its frequency increases because its speed increases.

9. The human eye has a converging lens system that produces an image at the back of the eye.

If the eye views a distant object, which type of image is produced?

virtual, inverted, magnified

real, erect, same size

real, inverted, diminished

virtual, erect, diminished

10. 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

A

D

C

B

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