Physics
A real gas can act as an ideal gas in

High pressure and low temperature
High pressure and high temperature
Low pressure and high temperature
Low pressure and low temperature

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

metals are good conductor of heat
plastics have a lower density than metals
plastics have a higher thermal conductivity than metals
metals have higher thermal capacity than plastics

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Physics
What is a compound microscope?

A microscope whose lenses are concave.
A microscope that has two sets of lenses : an occular lens and an eyepiece.
A microscope whose lenses are convex.
A microscope that has one lens.

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Physics
The sky appears blue because

In white light, the blue component dominates
All colours interfere to produce blue
The atmosphere scatters blue colour more than the others
It is actually blue

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