Physics
Which conservation principle is applicable in the case of the motion of a rocket?

Conservation of charge
Conservation of energy
Conservation of momentum
Conservation of mass

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Physics
To resolve an object in an electron microscope,

The wavelength of the electrons must be greater than the diameter of the object.
None of these
The wavelength of the electrons must be close to the diameter of the object
Both A & B

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

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Physics
Which of the following options correctly explains the term heat budget?

It is the balance between incoming and outgoing radiation
It is a mode of transfer of heat through matter by molecular activity.
It is the radiation from the earth in the form of long waves.
It is the amount of heat which the surface of earth receives from the sun.

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