Physics
The density of the liquid when heated

Does not change
May increase of decrease depending on pressure
Increases
Decreases

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Physics
Mirage is due to:

Equal heating of different parts of the atmosphere
Magnetic disturbances in the atmosphere
Depletion of ozone layer in the atmosphere
Unequal heating of different parts of the atmosphere

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Physics
'Mirage' is an example of

Refraction of light only
Total internal reflection of light only
Dispersion of light only
Refraction and total internal reflection of light

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Physics
When a pail of water is swung in a vertical circle, the water does not fall out at the top of the loop when the speed is

Above a certain minimum value irrespective of amount of water in the pail
Below a certain minimum value irrespective of amount of water in the pail
Above a certain minimum value depending on amount of water in the pail
Below a certain minimum value depending on amount of water in the pail

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