Physics
The wall of a dam is broader at the base

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

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Physics
What is a compound microscope?

A microscope whose lenses are concave.
A microscope that has two sets of lenses : an occular lens and an eyepiece.
A microscope whose lenses are convex.
A microscope that has one lens.

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Physics
Rainbows are produced when sunlight :

None of the given statements is correct.
Incident on rain drops hanging in the atmosphere is dispersed after suffering refraction and internal reflection.
Incident on rain drops hanging in the atmosphere is dispersed after suffering refraction
Incident on raindrops hanging in the atmosphere is dispresed after suffering reflection.

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