Revise Class 9 Science – Sound with Our MCQ Mock Test!

Can you explain how sound travels through different mediums or how pitch and loudness are related? Test your understanding with this MCQ-based mock test on Sound, designed as per the latest Class 9 Science syllabus. This test covers all the key concepts — production and propagation of sound, characteristics of sound waves (amplitude, frequency, wavelength, time period), speed of sound in different media, reflection of sound, echo, and uses of SONAR.

Each multiple-choice question helps you strengthen your conceptual knowledge, improve numerical accuracy, and gain confidence for exams. Whether preparing for school assessments or board-level understanding, this test gives you a complete and effective revision experience.

Attempt now and tune your preparation to perfection with the Sound mock test!

1. Speed of sound in air and water are given as va and vw respectively. Then

 
 
 
 

2. In the curve half the wavelength is

 
 
 
 

3. Infrasonic fi, Audible fa and Ultrasonic fu sounds are related as

 
 
 
 

4. Wave motion transfers

 
 
 
 

5. Earthquake produces which kind of sound before the main shock wave begins

 
 
 
 

6. The wave having an amplitude of 5 cm and frequency f = 100 Hz can be best represented by

 
 
 
 

7. The frequency of a visible light of wavelength 600 nm is (speed of light = 3 × 108 m/s), (1 nm = 10–9 m)

 
 
 
 

8. In the bell jar experiment, as air is removed

 
 
 
 

9. Speed of light or electromagnetic wave is higher than that of the speed of sound in air by

 
 
 
 

10. The terms ultrasonic, supersonic and infrasonic mean

 
 
 
 

11. A pulse

 
 
 
 

12. Which of the following is not the character of mechanical waves ?

 
 
 
 

13. The minimum size of a room required to hear an echo of sound with a speed of 300 m/s is

 
 
 
 

14. Before playing the orchestra in a musical concert, a sitarist tries to adjust the tension and pluck the string suitably. By doing so, he is adjusting

 
 
 
 

15. Sonic booms are caused by the combination of

 
 
 
 

16. When we change feeble sound to loud sound we increase its

 
 
 
 

17. Absorbent materials are to be used while making interior design in an auditorium as

 
 
 
 

18. Two audio devices of the same brand differ in their

 
 
 
 

19. Two sounds of same pitch and loudness differ in their

 
 
 
 

20. Echo is not heard in a room of 10 m × 10 m × 10 m dimension due to (speed of sound in air = 300 m/s)

 
 
 
 

21. Sound of crackers is heard during festival days, but the sound of supernova explosion in space is not heard on the surface of earth because of

 
 
 
 

22. A bat can hear frequencies upto 120 kHz. Considering the speed of the sound to be 300 m/s, the wavelength of the signal is

 
 
 
 

23. A wave is moving with a speed of 3000 cm/s with reversal after every 0.01 second. The wavelength of the wave is

 
 
 
 

24. Infrasound can be heard by

 
 
 
 

25. The instruments Megaphone, Stethoscope, Hearing aids and Sound boards work based on the principle of

 
 
 
 

26. The penetrating powers of ultrasonic waves and other audible sounds are given as f1 and f2 respectively. Then

 
 
 
 

27. A boat is rocked by waves such that a crest and a trough reach at an interval of 0.1 second with a speed of 50 m/s. The distance between two consecutive crests is

 
 
 
 

28. The separation between T and C in the figure given is

 
 
 
 

29. The pitch of the two signals A and B shown below are pA and pB respectively. Then

 
 
 
 

30. Sonic booms are caused due to the variation of

 
 
 
 

Question 1 of 30