Physics
If there is a circular hole in a metal plate, what happens to the radius of the hole when the plate is heated?

Unchanged
Decreases
Depends upon the metal
Increases

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Physics
Siphon will fail to work if:

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

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