Physics
Global warming is expected to result in

Change in coast line
Change in crop pattern
All of these
Increase in level of sea

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Physics
The velocity of sound in air

Does not depend on temperature
Decreases with decrease of temperature
Decreases with increase of temperature
Increases with decrease of temperature

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Physics
Siphon will fail to work if:

Both its limbs are of unequal length.
The level of the liquid in the two vessels are at the same height.
The densities of the liquid in the two vessels are equal.
The temperature of the liquids in the two vessels are the same.

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