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

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

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Physics
A hydrogen balloon floats up because of

Air pressure decreases with decrease in weight
Weight of the balloon is less than the weight of air displaced by it.
Air pressure decreases with decrease in height
The pressure inside the balloon is more than the pressure outside it

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