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Physics

Physics
What is the unit of relative density?

Kg/m
Kg/m3
It has no unit
Kg/m2

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Physics
Tap water is placed in an open pad and allowed to evaporate. After some time the temperature of water

Decreases rapidly
Decreases slightly
Increases slightly
Increases to a great extent

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Physics
A person lifts luggage of 20 kg from the ground and puts it on his head 2m above the ground. Calculate the work done by him. (g = 10 )

200J
40J
20 J
400J

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Physics
Materials for rain-proof coats and tents owe their water-proof properties to

viscosity
elasticity
surface tension
specific gravity

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

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

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Physics
Burns caused by steam are much severe than those caused by boiling water because

Steam pierces through the pores of body quickly
Steam is gas and engulfs the body quickly
Temperature of steam is higher
Steam has latent heat

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