Physics
Which one of the following is applicable to collision-coalescence process of precipitation?

Clouds which extend beyond the freezing level
Cirrocumulus cloud
Clouds which do not extend beyond the freezing level
All types of clouds

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Physics
Conservation of energy refers to the fact that

No chemical reaction is 100 percent efficient
If you conserve energy you will not be as tired
Energy cannot be created or destroyed but can be converted from one form to another
The entropy of the universe is always increasing

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Physics
The sensation of weightlessness in a spacecraft in an orbit is due to the

Acceleration in the orbit which is equal to the acceleration due to gravity outside
Fact that spacecraft in the orbit has no energy
Presence of gravity outside but not inside the spacecraft
Absence of gravity outside

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