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Sound and Waves — Science Questions & Practice

Practise 8 Sound and Waves questions from Science for competitive exams such as UPSC, Banking, SSC and Railway. Read the worked questions below, check every answer with an explanation, and track what you get wrong.

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Practice questions on Sound and Waves — with answers

Try each question first, then open the answer. Explanations are included.

1. What is the unit used to measure the loudness of sound?

AWatt (W)
BHertz (Hz)
CDecibel (dB)
DJoule (J)

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Answer: C

The correct answer is 'Decibel'.

2. What are sound waves with frequency above 20,000 Hz (beyond human hearing) called?

AMicrowaves
BInfrasonic waves
CUltrasonic waves (Ultrasound)
DRadio waves

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Answer: C

The correct answer is 'Ultrasonic waves (Ultrasound)'.

3. What are sound waves with frequency below 20 Hz (beyond human hearing) called?

ARadio waves
BMicrowaves
CInfrasonic waves (Infrasound)
DUltrasonic waves

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Answer: C

The correct answer is 'Infrasonic waves (Infrasound)'.

4. Which animals can hear ultrasonic sounds, used for navigation (echolocation)?

ABats and Dolphins
BDogs and Cats
CElephants and Whales (these hear infrasound)
DSnakes and Lizards

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Answer: A

The correct answer is 'Bats and Dolphins'.

5. What is 'Echo'?

AThe diffraction of sound waves
BThe absorption of sound waves
CThe reflection of sound waves off a surface back to the listener
DThe refraction of sound waves

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Answer: C

The correct answer is 'The reflection of sound waves off a surface back to the listener'.

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