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MCQ Science and Technology Chapter 12 Class 9 Maharashtra Board

Study of Sound

1. What are sounds below 20 Hz called?

Question 1 of 20

2. What are sounds above 20,000 Hz called?

Question 2 of 20

3. Which of the following is an example of infra sound?

Question 3 of 20

4. Which animal can hear infra sounds, as per the document?

Question 4 of 20

5. Who discovered that bats use their ears to navigate in the dark?

Question 5 of 20

6. What is one application of ultrasonic sound mentioned in the document?

Question 6 of 20

7. What is used to obtain images of internal organs in the human body?

Question 7 of 20

8. What technology is used to locate cracks and faults in metal blocks?

Question 8 of 20

9. In the sound reflection activity, what must be adjusted to hear the clock’s ticking clearly?

Question 9 of 20

10. What surface is required for the reflection of sound?

Question 10 of 20

11. Which material is a bad reflector of sound?

Question 11 of 20

12. What happens if one tube is lifted in the sound reflection activity?

Question 12 of 20

13. What is an echo caused by?

Question 13 of 20

14. At 22°C, what is the minimum distance between the source and reflecting surface for a distinct echo?

Question 14 of 20

15. What is the velocity of sound in air at 22°C, as per the document?

Question 15 of 20

16. What causes reverberation in a room?

Question 16 of 20

17. Why do some auditoriums have inferior sound reception?

Question 17 of 20

18. What does SONAR use to determine the distance of underwater objects?

Question 18 of 20

19. What is SONAR used to search for?

Question 19 of 20

20. What technology generates images of a foetus in a pregnant woman?

Question 20 of 20


 

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