Physics
A real gas can act as an ideal gas in

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

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Physics
Purpose of an optical filter is to

Reflect lights of different colours
Refract light of different colours
Transmit or absorb light of different colours
Dispense light into component colours

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Physics
Solids have definite shapes.This is because

The forces of cohesion are very large
The forces of adhesion are less
The forces of cohesion of the molecules within are very much less in them
The forces of adhesion are large

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