Physics
The energy of a photon, whose momentum is 10 MeV/c, where c is the speed of light, is given by

0.1 MeV
1 MeV
100 MeV
10 MeV

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Physics
On a clean glass plate a drop of water spreads to form a thin layer whereas a drop of mercury remains almost spherical because:

density of mercury is greater than that of water.
cohesion of water is greater than its adhesion with glass.
mercury is a metal.
cohesion of mercury is greater than its adhesion with glass.

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