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Physics

Physics
A light year is a measure of :

Time
Velocity
Distance
Speed

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Physics
Which one of the following determines the sharpness of image in a camera ?

The exposure time
The aperture
The focal length of the lens
Size of the camera

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Physics
1 WH =

36000 joules
360 joules
3600 joules
36 joules

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Physics
It is easier to carry two buckets of water in one hand each, than to carry only one in one hand because

Resultant weight of buckets is zero
Centre of gravity falls within the body
Centre of gravity and centre of equilibrium fall within the feet
Weights of buckets are balanced

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Physics
Woollen cloth protects the body from cold because

It is a poor conductor of heat
It reflects heat
External heat rays enter into the body through the woollen cloth
It is a good conductor of heat

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Physics
The composition of electrician solder is

Steel-37%, copper-63%
Iron-37%, tin-63%
Lead-37%, Steel-63%
Lead-37%, tin-63%

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