Question

C4. Multiple Choice Questions (MCQs): Choose the correct answer for each of the following.
1. Noise is produced by
(a) irregular vibrations.
(b) regular vibrations.
(c) both (a) and (b).
(d) either (a) or (b).
2. The audible range of sound for human beings is
(a) 200-2000 Hz. (b) 20-20000 Hz. (c) 20-23000 Hz. (d) 220-20000 Hz.
3. The loudness of a sound depends upon its
(a) amplitude.
(b) pitch.
(c) medium.
(d) frequency
4. In which of the following material is the speed of sound maximum?
(b) Sea water
(c) Freshwater
(d) Air
5. Sound cannot travel through
(b) water.
(a) air.
(c) iron.
(d) vacuum.
(a) Iron​

Answer 1

Answer:

1. (a)
2. (b)
3. (a)
4. (a)
5. (d)

Explanation:

1. noise is formed by irregular vibration but sound is formed by regular vibration.
2. the frequency that are audible to humans is 20 hertz to 20000 Hertz.
3. loudness of sound depends on amplitude . pic depends on frequency and quality depends on a waveform.
4. the speed of sound is maximum in solidthan liquids and in a gases. in case of liquid ,sound in sea water have more speed than fresh water.
5. sound cannot through travel in vacuum it is shown by Bell jar experiment.

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