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Class 9 Science Chapter 12 Sound Quiz 9 (25 MCQs)

Quiz Instructions

Select an option to see the correct answer instantly.

1. Identify a wave which is mechanical?

Correct Answer: C) Sound.

2. Sound of frequency below ..... is called infrasonic sound

Correct Answer: D) 20 Hz.

3. How do sound waves travel through a medium?

Correct Answer: B) Particles in the medium are displaced from their equilibrium position and then return to it, passing the energy of the wave along.

4. Sound waves with frequencies below 20 Hz are called:

Correct Answer: C) Infrasonic sound.

5. Part of the ear which collects sound from surroundings .....

Correct Answer: B) Pinna.

6. I heard the lion .....

Correct Answer: C) Roar.

7. Which word has the same sound as cake?

Correct Answer: B) Late.

8. Explain the phenomenon of reflection of sound.

Correct Answer: D) The reflection of sound occurs when sound waves hit a surface and bounce back.

9. Identify the initial sound in the word 'apple'.

Correct Answer: A) /a/.

10. Sound travels in air because:

Correct Answer: B) Disturbance moves through the medium.

11. How many children does Captain Von Trapp have?

Correct Answer: D) 7.

12. The distance between one crest or trough to the next

Correct Answer: D) Wavelength.

13. Explain the working principle of a sonar.

Correct Answer: C) Sonar works by sending sound waves and receiving their echoes to determine the distance and shape of underwater objects.

14. Toast

Correct Answer: B) Long o.

15. Echo is produced due to:

Correct Answer: C) Reflection of sound.

16. Give an example of an application of sound in daily life.

Correct Answer: B) Doorbell.

17. How does the density of a medium affect the speed of sound?

Correct Answer: A) Sound travels faster in denser mediums.

18. In order to hear an echo of a sound wave, the minimum distance between the original sound reflected sound should he

Correct Answer: A) 17.2m.

19. Which of the following is not a characteristic of sound waves?

Correct Answer: A) Amplitude.

20. Lost

Correct Answer: A) Short o.

21. Who played Maria in the version we watched in class?

Correct Answer: C) Carrie Underwood.

22. In which of the following phenomena does the sound wave bounce back?

Correct Answer: C) Reflection.

23. Find a word that follows the long /u/ sound in the initial or medial position of a one syllable word.

Correct Answer: B) Dude.

24. Float

Correct Answer: B) Long o.

25. What word has the same beginning sound as the word:Frog

Correct Answer: A) Free.

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