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Physics

Physics
Which of the following is optical illusion?

Rainbow
Mirage
Halo
Earthshine

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Physics
A concave lens always forms

An image type which depends on object characteristics
A real image
An image type which depends on lens curvature
A virtual image

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Physics
Charles's law is based on

Gas
None of these
Solid
Liquid

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Physics
Vegetables are cooked in lesser time by adding a pinch of salt while cooking because

Boiling point of water decreases
Boiling point of water increases
Latent heat of vaporization of water increases
Latent heat of vaporization of water decreases

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Physics
The word ''insolation' means

Insoluble matters
Incoming solar radiation
None of these
Matters which insulate

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Physics
Why do birds not have respiratory trouble at the time of flying at high altitude ?

They fly inactively
They use less oxygen
Their lungs are very large
They have extra air sacs

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