Physics
If objects appear enlarged and inverted in a rear view mirror, then which type of mirror is used?

Concave
Cylindrical
Convex
Plane

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Physics
Siphon will fail to work if:

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

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