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Physics

Physics
The speed of light in air is

3 × 108 m/s
3 × 10–8 m/s
8 × 103 m/s
Infinity

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Physics
We feel cool when we sit near the fan, this is because

Fan cools surrounding air.
Air vapourises the sweat on our body.
Fan gives cool air.
We feel cool when air touches the body.

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Physics
The apparent weight of a man in a lift is less the real weight when :

The lift is going down with an acceleration
The lift is going up with an acceleration
The lift is going down with uniform speed
The lift is going up with uniform speed

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Physics
Large astronomical telescopes always use as objective

lens
combinations of lenses
None of these
mirror

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Physics
Radio waves sent out by a radio stations are reflected by

Troposphere
Mesosphere
Stratosphere
Ionosphere

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Physics
The speed of sound in air depends on

Frequency
Wavelength
Temperature
None of these

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MORE MCQ ON Physics

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