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Physics

Physics
The washing machine works on the principle of

Diffusion
Centrifugation
Dialysis
Reverse osmosis

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Physics
In very cold countries alcohol is used as a thermometric liquid because

Alcohol can be coloured for its level to be seen easily
It will not stick to the glass tube
Alcohol is a poor conductor of heat
Its freezing point is very low

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Physics
Two metallic plate of equal thickness and coefficient thermal conductivity K1 and K2 put together face to face. A common plate is constructed. What is equivalent K?

K1+k2/k1k2
K1k2/k1+k2
None
2k1k2/k1+k2

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Physics
Kilowatt-hour is the unit of :

Power
Force
Momentum
Energy

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Physics
No current will flow between two charged bodies if they have the same

Resistance
Charge/ potential ratio
Potential
Charge

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Physics
What changes will happen to a bowl of ice and water kept at exactly zero degree Celsius ?

All water will become ice
All ice will melt
No change will happen
Only some ice will melt

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