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Physics

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

Silver nitrate
Mercury
Red oxide
Silver

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Physics
Lightning is caused due to

Electric discharge
Electric pressure
Electric leak
Electric power

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Physics
Two metallic wires made from copper have same length but the radius of wire 1 is half of that of wire 2. The resistance of wire 1 is R. If both the wires are joined together in series, the total resistance becomes

3R/4
R/2
2R
5R/4

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Physics
In the atmosphere ultraviolet rays are absorbed by

Helium
Ozone
Oxygen
Nitrogen

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Physics
At boiling point of liquids, its

Atmospheric pressure increases
Temperature remains constant
Temperature increases
Vapour pressure decreases

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Physics
The term photon refers to

Light ray
None of these
Radiation
Sub atomic particle

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MORE MCQ ON Physics

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