Physics
Which of the following branch of Physics deal with study of Atomic Nuclei?

None of these
Bio Physics
Atomic Physics
Nuclear Physics

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Physics
X-rays region lies between

Visible and infra-red region
Ultraviolet and visible region
Gamma-rays and ultraviolet region
Short radio waves and long radio waves

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Physics
The sensation of weightlessness in a spacecraft in an orbit is due to the

Presence of gravity outside but not inside the spacecraft
Acceleration in the orbit which is equal to the acceleration due to gravity outside
Fact that spacecraft in the orbit has no energy
Absence of gravity outside

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Physics
On a cold day when the room temperature is 15°C, the metallic cap of a pen becomes much colder than its plastic body, though both are at the same temperature of 15°C, because :

Plastics have a lower density than metals
Plastics have a higher thermal conductivity than metals
Metals are good conductors of heat
Metals have higher thermal capacity than plastics

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