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Physics

Physics
One watt-hour is equivalent to

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

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Physics
The word "Physics" comes from the Greek word

Phiji
None of these
Phusik
Fusis

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Physics
Large transformers, when used for some time, become very hot and are cooled by circulating oil. The heating of the transformer is due to:

Intense sunlight at noon
The heating effect of current alone
Hysteresis loss alone
Both the heating effect of current and hysteresis loss

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Physics
The speed of light in air is

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

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Physics
A body absorbs heat most if it is

Black and smooth
White and rough
Black and rough
White and smooth

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Physics
When the speed of car is doubled, then what will be the braking force of the car to stop it in the same distance ?

Two times
Half
One-fourth
Four times

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