Physics
Convex mirror is generally used in ________

Reflector for head light
Solar cookers
Rear view mirror
Opthalmoscope

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Physics
Isotopes of an element contain

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

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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:

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

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