Which phenomenon is responsible for the echo of sound wave?
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Mohan, having a mass of 40 kg, runs up a staircase of 50 steps in 10 s. If the height of each step is 15 cm, then what is his power?
During uniform motion of an object along a straight line, its ___________ remains constant with time
Calculate the frequency (in Hz) of a sound wave of wavelength 4m travelling with a speed of 200 m/s.
Which one among the following components is used as an amplifying device?
The SI unit of intensity of sound is ______.
If an object moves in a purely rotatory motion, then each constituent particle of the body moves in a circle, the centre of which is located on a line is called _______.
Fundamental duties are included in the Indian Constitution by the_________Amendment.
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