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Standard VIII
Physics
Noise Pollution and Measures to Control It
Which of the ...
Question

Which of the following statement(s) is(are) correct?
1. The number of oscillations per second of a vibrating object is called its time period.
2. If the amplitude of vibration is large, sound is feeble.
3. The lower the frequency of vibration, the higher is the pitch.
4. Noise pollution may cause partial hearing impairment.

A
Only 3
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B
Only 4
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C
Only 1, 2, and 3
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D
All statements are correct
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Solution

The correct option is B Only 4

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Q.

State whether the following statements are true or false:

(a) Sound cannot travel in vacuum.

(b) The number of oscillations per second of a vibrating object is called its time-period.

(c) If the amplitude of vibrations is large, sound is feeble.

(d) The lower the frequency of vibration, the higher is the pitch.

(e) If the amplitude of vibrations is doubled, the loudness of sound also gets doubled.

(f) When the amplitude of vibrations is halved, the loudness of sound becomes one-fourth.

(g) Unwanted or unpleasant sound is termed as music.

(h) Noise pollution may cause partial hearing impairment.

Q. Which of the following statements is correct?
(a) The time taken for one oscillation is the frequency.
(b) The distance covered by a vibrating body while making one complete oscillation is four times the amplitude.
(c) The greater the amplitude of a vibrating body, the higher will be the pitch of the sound it gives out.
(d) In a string instrument, thin strings are used for low pitch notes.
Q. In the following sentence. say 'True' and 'False'
(a) Sound can't travel in vacuum (T/F)
(b) The number of oscillations per second of a vibrating object is called its time period. (T/F)
(c) If the amplitude of vibration is large, sound is feeble. (T/F)
(d) For human ears, the audible range is 20Hz to 20,000Hz. (T/F)
(e) The lower the frequency of vibration, the higher is the pitch.
(f) Unwanted or unpleasant sound is termed as music. (T/F)
(g) Noise pollution may cause partial hearing impairment. (T/F)
Q. Which of these statements about sound are correct? (There can be more than one statement)
1. Human ear drum senses the vibration of sound.
2. Higher is the frequency of vibration, lower is the pitch.
3. Amplitude of vibration affects the frequency of sound.
Q. If the amplitude of vibration is large, sound is feeble.
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