Physics
The wall of a dam is broader at the base

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

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Physics
Why does the sea appear blue in colour?

Interference of the sun light from water surface
Refraction of the sun light
Reflection of the sun light from water surface
Scattering of the sunlight by water molecules

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Physics
Isotopes of an element contain

equal number of protons and electrons
equal number of nucleons
the same number of neutrons but different number of protons
the same number of protons but different number of neutrons

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