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Physics

Physics
What is the unit of the physical quantity "Inductance"?

Henry
Tesla
Farad
Weber

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Physics
Contact force is another name for ________

Electrostatic force
Friction
Muscular force
Magnetic force

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

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

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Physics
The frequency of direct current is ________

100 HZ
50 HZ
60 HZ
Zero

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Physics
Which best describes how air moves during convection?

Cool air is replaced by warm air
Cool air falls down
Warm air falls down
Air always falls down

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Physics
Parabolic mirrors are used in

Shaving mirros
Driving mirrors
Dentists mirros
Car headlights

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