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Meghraj Padwal from ST THOMAS ENGLISH SCHOOL, KALYAN
Subject :NSO    Class : Class 8

An object vibrates 7200 times in 8 minutes. A girl standing close to the object hears

A

B

C

DNo sound.


Ans 1:

Chatresh ramasai gudi from Bgsnps , Bangalore
Class : Class 8
The frequency is 900 hertz and can be heard by a human ear.

Ans 2: (Master Answer)

Admin from revisewise, Noida
Class : Class 1
The correct answer is D.

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