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Physics

Physics
Stars appear twinkling because of ......... of light.

Absorption
Scattering
Reflection
Emission

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Physics
Rectifiers are used to convert:

Direct current to Alternating current
Low voltage to high voltage
Alternating current to Direct current
High voltage to low voltage

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Physics
The colours of stars depend on their

Atmospheric pressure
Radius
Distance
Temperature

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Physics
Atomic hydrogen has a life period of

One hour
One minute
A fraction of a second
One day

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Physics
Where do the electrical charges reside in a charged conductor?

Depended upon the nature of the body
Throughout the body
At the core
Outer surface of the body

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Physics
Two metallic wires made from copper have same length but the radius of wire 1 is half of that of wire 2. The resistance of wire 1 is R. If both the wires are joined together in series, the total resistance becomes

3R/4
R/2
2R
5R/4

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