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Physics

Physics
Which of the following is a conductor of electricity ?

Rubber
Salt water
Pure water
Benzene

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Physics
The locomotion of insects to the source of light is called :

Hydrotropic
Phototropic
Phototactic
Thermotactic

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

Silver nitrate
Silver
Red oxide
Mercury

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Physics
In spherical polar coordinates (l, q, a), q denotes the polar angle around z-axis and a denotes the azimuthal angle raised from x-axis . Then the y-component of P is given by

Psinq sina
Pcosq cosa
Pcosq sina
Psinq cosa

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Physics
Supersonic plane fly with the speed

of sound
greater than the speed of sound
less than the speed of sound
of light

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Physics
The speed of light will be minimum while passing through

Air
Water
Vaccum
Glass

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