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Physics

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

Silver
Red oxide
Silver nitrate
Mercury

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Physics
Brightness of bulb depends on voltage or current?

Current
Voltage
Both A & B
None

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

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

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Physics
Which compressor is usually used in AC?

Reciprocating
Axial
Centrifugal
Rotary

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Physics
No current will flow between two charged bodies if they have the same

Potential
Charge/ potential ratio
Resistance
Charge

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

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

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