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Physics

Physics
An object at rest may have

Potential energy
Velocity
Momentum
Kinetic energy

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Physics
Metals are good conductors of electricity because:

All of these
They have high melting point.
They contain free electrons.
The atoms are lightly packed.

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Physics
Clouds float in the atmosphere because of their

Low temperature
Low viscosity
Low pressure
Low density

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Physics
Which of the following is the fastest communication channel?

Microwave
Optical fiber
All are operating at nearly the same propagation speed
Radio wave

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Physics
The weakest of all fundamental forces is

Nuclear force
Gravitational force
Electrostatic force
Magnetic force

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Physics
A barometer is kept inside a bell jar. Air is slowly pumped out of the jar.

The mercury level starts falling
The bell jar breaks up
The mercury level does not change
The mercury level starts rising

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