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Physics

Physics
In the atmosphere ultraviolet rays are absorbed by

Ozone
Nitrogen
Helium
Oxygen

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Physics
Which of the following is an insulator?

Glass
Mercury
Carbon
Germanium

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Physics
Friction can be reduced by changing from

Dynamic to Static
Rolling to Sliding
Static to Dynamic
Sliding to Rolling

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Physics
One watt-hour is equivalent to

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

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Physics
Transformer is a device to convert

Mechanical energy into Electrical energy
Low voltage D.C. into high voltage D.C.
Low voltage A.C. into high voltage A.C.
C. to A.C.

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Physics
Ultra violet radiations of the Sun do not reach the earth because, earth's atmosphere is surrounded by

Ozone
Carbon dioxide
Ammonia
Chlorine

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