Physics
A photostat machine works on

Magnetic image making
Electromagnetic image making
Thermal image making
Electrostatic image making

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Physics
Solids have definite shapes.This is because

The forces of adhesion are large
The forces of adhesion are less
The forces of cohesion of the molecules within are very much less in them
The forces of cohesion are very large

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Physics
A dynamo is a device which

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

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

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

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