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Physics

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

Red oxide
Mercury
Silver nitrate
Silver

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Physics
Optical Fibre technology works on which of these principles of Physics?

Photoelectric effect
Newton's law of Motion
Total internal reflection of Light
Bernoulli's Principle

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Physics
After long periods of use, a grey spot develops on the inside of a bulb. This is because

The tungsten filament evaporates and collects there
Glass undergoes a change due to the heat
The heat of the bulb scorches the glass at the top
Dust inside the bulb condenses on the top

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Physics
Light travels slowest in

Glass
Vacuum
Water
Air

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Physics
Conversion of sound energy into electrical energy is done by

Gramophone
Solar cell
Loudspeaker
Microphone

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Physics
One watt-hour is equivalent to

3.6 x 103 J
6.3 x 103 J
3.6 x 10-3 J
6.3 x 10-7 J

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MORE MCQ ON Physics

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