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Physics

Physics
In mirrors the back surface is coated with a thin layer of :

Red oxide
Silver
Silver nitrate
Mercury

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Physics
A bimetal made copper and iron strips welded together is straight at room temperature. It is held vertically with iron strip towards left and copper strip towards right. If this bimetal is heated, it will

Bend towards right
Remain straight
None of these
Bend towards left

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Physics
Quality of transmission depends upon

Nature of medium only
Nature of signal only
Both (A) and (B)
Neither A nor B

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Physics
Which of the following has the highest entropy?

Diamond
Mercury
Liquid nitrogen
Hydrogen

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Physics
Which of the following is a result of Surface tension ?

Gravitational pull
Capillary action
Viscosity
Radiation

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Physics
Which tube used to produce X-ray?

Roentgen
X-ray tube
Coolidge tube
None of these

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