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Physics

Physics
Lens is made up of which glass

Flint glass
Ordinary glass
Cobalt glass
Pyrex glass

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Physics
Vegetables are cooked in lesser time by adding a pinch of salt while cooking because

Latent heat of vaporization of water decreases
Boiling point of water decreases
Boiling point of water increases
Latent heat of vaporization of water increases

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Physics
What type of lens is used in a magnifying glass

Convex
Plano-concave
None of these
Concave

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Physics
Outside of cooking utensils are generally left black from below because

It is difficult to clean daily.
Black surface is a good absorber of heat.
Black surface is a good conductor of heat.
Black surface is a poor conductor of heat.

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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
Psinq cosa
Pcosq cosa
Pcosq sina

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Physics
In the absence of the earth's atmosphere, sky would appear

Deep red
Blue
White
Black

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MORE MCQ ON Physics

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