Page 95 - Genius Kidz Prudence Learning Sc-8

4. Mark the statements as True /False .
(a) Bird chirping is a highly pitched sound.

(b) Loudness of voice depends on amplitude of vibrations.
(c) Voice recording studies are made of hard material such as iron only.

5. Prepare a project report on “Noise pollution–Causes and Prevention.”

6. Can sound produced in America be heard in India. Explain why or why not?

7. Does the vibration of every solid particle produce sound? Explain with the help of an example.

8. Very short answer type questions.
(a) What is amplitude?
(b) What is frequency?

(c) What is time period?
(d) What is oscillation?
(e) Distinguish between infrasonics and ultrasonics?

9. Short answer type questions.
(a) What is sound?

(b) What are audible and inaudible sounds?
(c) How are echos useful?
(d) Explain in brief what you mean by quality of sound.

10. Long answer type questions.

(a) What is sound? How will it be produced? Where can it propagate?
(b) Explain the sound detection and sound production source in human beings.
(c) Write a note on :

(i) Loud sound. (ii) Pitched sound.
(d) Explain in brief what you mean by quality of sound.

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