11. A pitch depends upon :
(a) Loudness
(b) Speed sound
(c) Frequency
(d) None of these
12. Sound waves are _______ in nature.
(a) Electromagnetic
(b) Longitudinal
(c) Transverse
(d) None of these
13. The velocity of sound wave in air is :
(a) 330 m/sec
(b) 331 m/sec
(c) 332 m/sec
(d) 333 m/sec
14. A human being can hear a sound of frequency ranging _______ .
(a) 20 Hz to 20 kHz
(b) Below 20 Hz
(c) Above 20 Hz
(d) None of these
15. Velocity of sound in vaccum is given by :
(a) 332 m/sec
(b) 0
(c) Infinity
(d) None of these
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