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

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

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Physics
A dynamo is a device which

Creates electrical energy
Converts mechanical energy into electrical energy
Converts electrical energy into mechanical energy
Creates mechanical energy

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Physics
The wall of a dam is broader at the base

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

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