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Physics

Physics
Which tube used to produce X-ray?

Roentgen
None of these
Coolidge tube
X-ray tube

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Physics
For photoelectric effect to take place, the metal used as the cathode should have ________

Low work function
Low resistance
High melting point
Low melting point

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Physics
On the Kelvin scale, the melting point of ice is

100K
373K
273K
0 K

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Physics
In severe winter, in cold countries water pipes burst because

Contraction of water pipes
Combined effect of all the above three
Water expands on freezing
High atmospheric pressure

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Physics
A freely suspended magnet remains horizontal at

The geographic pole
The magnetic north pole
The magnetic south pole
The magnet equator

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Physics
Which of the following represents a relation for ''heat lost = heat gained'?

Principle of vaporization
Principle of thermal equilibrium
Principle of calorimetry
Principle of colors

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