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Physics

Physics
At low temperature, Lead behaves as a :

Conductor
Superconductor
Insulator
Semi conductor

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Physics
The laws which govern the motion of planets are called ________

Avogadro's laws
Newton's Laws
Kepler's Laws
De Morgan's Laws

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Physics
Cloudy nights are warmer compared to clear cloudless nights, because clouds mainly

Absorb heat from the atmosphere send it towards earth
Reflect back the heat given by earth
Prevent cold waves from the sky descending on earth
Produce heat and radiate it toward earth

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Physics
Sound waves do not show the phenomenon of

Interference
Refraction
Diffraction
Polarisation

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Physics
Temperature of distant luminous bodies can be determined by

Colour thermometers
Pyrometers
Gas thermometers
Mercury thermometers

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

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

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