Home » MCQ on Class 9 Science Chapter 11: Sound

MCQ on Class 9 Science Chapter 11: Sound

By Abdur Rohman / June 25, 2024

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Chapter 11 of class 9 science as per the NCERT syllabus is Sound which deals with the Production of Sound, Propagation of Sound, Characteristics of a Sound Wave, Reflection of Sound, Echo, Reverberation, Range of Hearing, Applications of Ultrasound, etc.

Here, we have discussed 30 Multiple Choice Questions based on these topics of the chapter. These questions will help you to learn more about the chapter and test your knowledge.

For each question below, there are four options out of which only one option is correct. After selecting your answer, click on the submit button to see the score and review your answers.

MCQ on Class 9 Science Chapter 11

1. What is sound?

A. A form of energy that produces a sensation of hearing in our ears B. A form of mechanical energy C. A form of light energy D. None of the above

2. How is sound produced?

A. By striking an object B. By setting an object vibrating C. By rubbing an object D. All of the above

3. What is required for the transmission of sound?

A. A solid medium B. A liquid medium C. A gaseous medium D. Any medium (solid, liquid, or gas)

4. What happens when an object vibrates?

A. It sets the particles of the medium around it vibrating B. It creates a vacuum C. It absorbs sound D. None of the above

5. How is sound propagated in a medium?

A. By moving particles B. By compressions and rarefactions C. By creating waves in the medium D. By creating density variations in the medium

6. What are the regions of high pressure in a sound wave called?

A. Rarefactions B. Compressions C. Troughs D. Peaks

7. What type of waves are sound waves?

A. Transverse waves B. Longitudinal waves C. Electromagnetic waves D. Surface waves

8. What property of sound determines its pitch?

A. Amplitude B. Frequency C. Speed D. Wavelength

9. What is the SI unit of frequency?

A. Hertz (Hz) B. Meter (m) C. Second (s) D. Pascal (Pa)

10. What is the relationship between frequency (ν) and time period (T) of a wave?

A. ν = T B. ν = 1 / T C. ν = T^2 D. ν = T / 2

11. What determines the loudness of a sound?

A. Amplitude B. Frequency C. Speed D. Wavelength

12. What is the region of low pressure in a sound wave called?

A. Compression B. Crest C. Rarefaction D. Trough

13. What is the wavelength of a sound wave?

A. The distance between two crests B. The distance between a crest and a trough C. The distance between two consecutive compressions D. The distance between two nodes

14. What is the speed of sound in air at 20°C?

A. 343 m/s B. 1500 m/s C. 299,792,458 m/s D. 300 m/s

15. How does the speed of sound change with temperature?

A. It decreases with an increase in temperature B. It increases with an increase in temperature C. It remains constant D. It depends on the medium

16. What is the principle of superposition of sound waves?

A. When two sound waves meet, they cancel each other out B. When two sound waves meet, the resultant displacement is the sum of their individual displacements C. When two sound waves meet, they double in amplitude D. When two sound waves meet, they reflect off each other

17. What is an echo?

A. Sound that is absorbed by an object B. Sound that is transmitted through an object C. Sound that is reflected back D. Sound that is refracted

18. What is the minimum distance required for an echo to be heard distinctly?

A. 17.2 meters B. 34.4 meters C. 50 meters D. 10 meters

19. What is the unit of loudness?

A. Hertz (Hz) B. Decibel (dB) C. Meter (m) D. Pascal (Pa)

20. What is reverberation?

A. The absorption of sound B. The transmission of sound C. The reflection of sound D. The persistence of sound after the source has stopped producing sound

21. How can reverberation be reduced in a hall?

A. By increasing the volume of the sound B. By using sound-absorbing materials C. By using loudspeakers D. By using microphones

22. What is the audible range of sound for humans?

A. 0 to 20 Hz B. 20 Hz to 20 kHz C. 20 kHz to 100 kHz D. 20 Hz to 200 kHz

23. What are ultrasound waves?

A. Sound waves with frequencies below 20 Hz B. Sound waves with frequencies between 20 Hz and 20 kHz C. Sound waves with frequencies above 20 kHz D. Sound waves with frequencies above 100 kHz

24. What is sonar?

A. A device used to measure the speed of sound B. A device used to measure the frequency of sound C. A device used to detect objects under water using sound waves D. A device used to amplify sound

25. What is the principle behind sonar?

A. Reflection of light waves B. Reflection of sound waves C. Refraction of sound waves D. Diffraction of sound waves

26. How is ultrasound used in the medical field?

A. For measuring blood pressure B. For imaging internal organs C. For hearing aids D. For measuring body temperature

27. What is echolocation?

A. The process of locating objects using reflected light B. The process of locating objects using magnetic fields C. The process of locating objects using reflected sound D. The process of locating objects using radio waves

28. What type of sound waves are used in echocardiography?

A. Infrasonic waves B. Audible waves C. Ultrasonic waves D. Electromagnetic waves

29. Which animal uses echolocation for navigation?

A. Bat B. Dog C. Cat D. Elephant

30. What is the speed of sound in water?

A. 343 m/s B. 1500 m/s C. 300 m/s D. 5000 m/s

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The Bottom Line

I hope these 30 MCQs on Sound of Class 9 Science Chapter 11 have helped you in your studies and preparation.

If you have any queries, or comments or find any mistake in the above questions, feel free to contact me in the comment section below.

I would love to hear from you.

Abdur Rohman

Abdur Rohman is an Electrical Engineer from Charaideo, Assam, who wears multiple hats as a part-time teacher, blogger, entrepreneur, and digital marketer. Passionate about education, he founded The Assam School blog to provide free, comprehensive textbook solutions, MCQs (Multiple Choice Questions), and other academic content for students from Class V to XII.