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Physics

Physics
At what temperature (in Fahrenheit) pure water freezes?

48
37
32

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Physics
The atmosphere is heated mainly by

Insolation
Radiation
Convection
Conduction

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Physics
Solar cells work on the principle of

Photoelectric effect
Photosynthesis
Photovoltaic effect
Photoconductive effect

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Physics
A man standing close to the platform at a railway station experiences a pulling force towards a fast moving train because of ________ .

Pressure difference due to fast moving air in between
Gravitational force between train and man
The centripetal force
Illusion of the man

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Physics
On a stationary sail boat, air is blown from a fan attached to the boat. The boat

moves in opposite direction in which the air is blown
moves in the same direction in which air blows
does not move
spins around

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Physics
The width of depletion layer of a P-N junction

Is independent of applied voltage
Is increased under reverse bias
Increases with heavy doping
Decreases with light doping

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