Physics
Convex mirrors are used as a rear view mirror in motor cycles because

It forms erect (upright) image
It forms smaller image as compared with object
All of these
It forms real image

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Physics
The wall of a dam is broader at the base

To withstand pressure that increases with depth
To withstand pressure that is increased with atmospheric pressure
To withstand pressure that increases in a horizontal plane
Because streamlining is required

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