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Physics

Physics
One watt-hour is equivalent to

3.6 x 103 J
6.3 x 10-7 J
3.6 x 10-3 J
6.3 x 103 J

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Physics
Red light is used for signals because it has

High intensity
High frequency
Low refraction in the medium
Long wavelength

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Physics
A bullet of mass 10gm is fired with a velocity of 40 m/s from a gun of mass 8 kg. Find the recoil velocity (in m/s) of the gun.

2
4
0.1
0.05

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Physics
Decibel is the unit used for

Intensity of heat
Intensity of sound
Radio wave frequency
Speed of light

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Physics
The waveform of a certain signal can be studied by

Cathode ray oscilloscope
Spectrometer
Sonometer
P – n junction diode

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Physics
Amount of water vapour (gaseous) in a given volume of air (cubic metre) is known as:

Specific humidity
Relative humidity
Mixing ratio
Absolute humidity

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