# MCQs Question for Class 9 Science Chapter 12 Sound with Answers

## CBSE Class 9 Science Chapter 12 “Sound” Multiple Choice Questions with Answers

Sound MCQ – Here is a compilation of Free MCQs of Class 9 Science Book Chapter 12 Sound with Answers.  Students can practice free MCQs as have been added by CBSE in the new Exam pattern. At the end of Multiple- Choice Questions, the answer key also has been provided for your reference.

Q.1. The minimum distance in which a sound wave repeats itself is called _____.

(a) frequency

(b) amplitude

(c) wavelength

(d) time period

Q.2. Identify the correct representation of the audible range for human beings?

(a) 2 kHz – 20 kHz

(b) 0.02 kHz – 20 kHz

(c) 0.2 kHz – 20 kHz

(d) 0.02 kHz – 2 kHz

Q.3. The frequency of a sound wave

(a) is a characteristic of the source of sound.

(b) decreases if the amplitude of the wave increases.

(c) increases if the amplitude of the wave increases.

(d) depends on the nature of the medium in which the wave propagates.

Q.4. A mechanical wave can propagate

(a) Through a gas

(b) without a material medium

(c) through a liquid.

(d) Both (a) and (c)

Q.5. The SI unit of frequency is _____.

(a) s-1

(b) Hertz

(c) m-1

(d) Both (a) and (b)

Q.6. A mechanical wave can travel

(a) in a material medium but not in vacuum

(b) in vacuum but not in a material medium,

(c) both in vacuum and a material medium.

(d) neither in a material medium nor in vacuum.

Q.7. Amplitude of a sound wave indicates

(a) the distance travelled by the wave in one second.

(b) the distance between two vibrating particles which are in phase.

(c) the distance between a compression and an adjacent rarefaction.

(d) the maximum displacement of a particle in either side of its mean position.

Q.8. Which of the following is a mechanical wave?

(b) A sound wave travelling in air

(c) A light wave travelling in air

(d) Microwave

Q.9. The SI unit of wavelength is _________.

(a) m-1

(b) m-2

(c) cm-1

(d) m

Q.10. What is the full form of SONAR?

(b) Sound Noise and Ranging

(d) None of these

Q.11. The loudness of a sound is

(a) directly proportional to amplitude of vibration.

(b) inversely proportional to amplitude of vibrations.

(c) directly proportional to square of the amplitude of vibration.

(d) inversely proportional to square of the amplitude of vibration.

Q.12. Identify the one that represents an ultrasonic frequency from the following.

(a) 5 kHz

(b) 12 kHz

(c) 18 kHz

(d) 24 kHz

Q.13. In a mechanical wave,

(a) a disturbance propagates through a medium.

(b) medium particles carry energy from one place to another place.

(c) medium particles vibrate in random directions.

(d) medium particles do not move from their mean positions.

Q.14. The part of the human ear that vibrates when sound from an external source incident on it is called

(a) tympanic membrane

(b) pinna

(c) cochlea

(d) anvil

Q.15. Identify the quantities which determine the pitch of a sound?

(a) Velocity

(b) Wavelength

(c) Time period

(d) Frequency

### Answer Key for Class 9 Science Chapter 12 Sound MCQs

 Q. Ans Q. Ans 1 (c) 9 (d) 2 (b) 10 (a) 3 (a) 11 (c) 4 (d) 12 (d) 5 (d) 13 (a) 6 (a) 14 (a) 7 (d) 15 (d) 8 (b)