Q87 of 123 Page 256

Before playing the orchestra in a musical concert, a sitarist tries to adjust the tension and pluck the strings suitably. By doing so he is adjusting:

He is adjusting the frequency of the sitar string, with the frequency of other musical instruments.

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85

Which of the following sound frequencies can be heard by a woman having a normal hearing range?

A) 25000 Hz


B) 15kHz


C) 40000 Hz


D) 25Hz

 86

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 88

A key of mechanical piano is first struck gently and then struck again but much harder this time. In the second case:

 89

One of the following can hear infrasound. This one is: