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Subject :NSO    Class : Class 8

Four different whistles, when blown, emit pure notes with the frequencies, 0.1 kHz, 1 kHz, 10 kHz, 100 kHz.
How many of the frequencies are above the normal audible range for humans?
(a) 1
(b) 2
(c) 3
(d) 4


Ans 1:

Class : Class 8
it should be 3

Ans 2:

Class : Class 8
It should be 3 because human ear can hear 20 hz to 20 khz

Ans 3:

Class : Class 8
It should be 3

Ans 4:

Class : Class 8
Sorry it should be 1

Ans 5: (Master Answer)

Class : Class 1
The correct answer is A.

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