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MCQ Science and Technology Chapter 12 Class 9 Maharashtra Board

Study of Sound

1. What is applied to the skin during sonography to ensure proper contact?

Question 1 of 20

2. What misuse of sonography is mentioned in the document?

Question 2 of 20

3. What part of the human ear collects sound waves?

Question 3 of 20

4. What vibrates in the middle ear when a sound wave reaches it?

Question 4 of 20

5. What structure in the inner ear resembles the shell of a snail?

Question 5 of 20

6. What converts vibrations into electrical signals in the human ear?

Question 6 of 20

7. What should be avoided to prevent injury to the eardrum?

Question 7 of 20

8. In the solved example, what is the depth of the sea if the SONAR echo is received after 4 seconds?

Question 8 of 20

9. In the solved example, what is the velocity of sound in seawater used for the SONAR calculation?

Question 9 of 20

10. In the exercise example, what is the temperature when the velocity of sound in air is 344 m/s?

Question 10 of 20

11. What medium does sound not travel through, as per the exercise?

Question 11 of 20

12. Which medium has a higher velocity of sound than water, as per the exercise?

Question 12 of 20

13. What natural phenomenon demonstrates that sound travels slower than light?

Question 13 of 20

14. What is used to discover objects deep inside the sea, as per the exercise?

Question 14 of 20

15. Why is the roof of a conference hall curved, as per the exercise?

Question 15 of 20

16. Why is there high reverberation in a closed, empty house, as per the exercise?

Question 16 of 20

17. Why is an echo not heard in a classroom, as per the exercise?

Question 17 of 20

18. In the exercise example, what is the distance of lightning if thunder is heard 4 seconds after seeing it?

Question 18 of 20

19. In the exercise example, what is the velocity of sound if an echo is heard after 4 seconds from a wall 660 m away?

Question 19 of 20

20. In the exercise example, what is the distance between two parallel walls if echoes are heard after 4 s and 6 s?

Question 20 of 20


 

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