Physics
Mirage is due to:

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

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Physics
The sky appears blue because

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

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Physics
A capillary tube is partially dipped vertically in a vessel containing water. Due to capillarity water rises in the tube. The height of water rise in the tube can be increased by

Increasing the radius of the capillary tube
Decreasing the radius of the capillary tube
Increasing the height of water in the vessel
None of these

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