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. Which of the following is a possible unit for wavelength?

coulomb

metre per second

kilometer

hertz

2. A fish in a pond looks up at a man standing beside the pond. To the fish, the man appears _________.

Larger and nearer than he actually is.

Smaller and further than he actually is.

Larger and further than he actually is.

Smaller and nearer than he is actually is.

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

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

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

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

the air particles from the floor flowed into our ears.

4. Which of the following is not possible?

An explosion is heard by an astronaut when a laser beam hits an enemy fighter in space.

A mole hears another mole underground.

A man knocks at one end of a long metal pipe and another man hears the knock at the other end.

A whale hears another whale in the deep sea.

5. 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

6. When light in glass strikes the glass-air interface at an angle of incidence less than the critical angle, which of the following statement is true?

It totally exits the glass.

It is totally reflected back into the glass.

It is reflected back along its original path.

It is partially reflected back into the glass.

7. The wavelength of a wave is ___________.

the distance from a crest to a trough.

the distance from a crest to another crest.

the distance between successive troughs.

the distance from the start of a wave to the end of the wave.

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

An explosion in outer space

A hammer hitting a block of rubber

A gun fired in a room

A bell ringing under water

9. Three rays of light are incident on the boundary between a glass block and air.

The angles of incidence are different.

What is a possible critical angle for light in the glass?

$30^{\circ}$

$60^{\circ}$

$15^{\circ}$

$45^{\circ}$

10. Which statement is true for all electromagnetic waves?

They have the same frequency in air.

They travel at the same speed in a vacuum.

They can be seen.

They are longitudinal.

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