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Physics

Physics
Which of the following device is used to measure humidity?

Anemometer
Psycho Meter
Hydrometer
Hygrometer

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Physics
Good conductor of electricity is

Graphite
Kerosene
Paper
Dry air

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Physics
Which of the following has the shortest wavelength?

Gamma rays
Microwaves
Infrared rays
Radio waves

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

Red oxide
Mercury
Silver
Silver nitrate

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Physics
The surface tension of water on adding detergent to it

Increases
Becomes zero
Decreases
No change

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Physics
The magnifying power of an astronomical telescope can be decreased by

Decreasing the focal length of the eyepiece
Increasing the focal length of the objective
Increasing the focal length of the eyepiece
None of these

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