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Physics

Physics
Nuclear sizes are expressed in a unit named

Tesla
Newton
Fermi
Angstrom

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Physics
A bullet of mass 10gm is fired with a velocity of 40 m/s from a gun of mass 8 kg. Find the recoil velocity (in m/s) of the gun.

0.1
4
0.05
2

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Physics
A nuclear reactor is said to have become 'critical' when

It is ready to produce controlled energy
It stops due to malfunctioning
It is shut down to avoid explosion
It starts emitting dangerous radioactive radiations

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Physics
A cup of hot coffee is placed on a metal table in a room. By which of the following methods does it lose heat?

Conduction, convection and radiation
Conduction and convection only
Convection and radiation only
Conduction and radiation only

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Physics
The spring balance works on the principle of ________ .

Bernoulli's principle
Boyle's Law
Pascal's Law
Hooke's Law

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Physics
The velocity of sound in moist air is more than in dry air because the moist air has

More density than dry air.
Less pressure than dry air.
More pressure than dry air.
Less density than dry air.

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