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Physics

Physics
The velocity of the sound is highest in

Vacuum
Water
Air
Metal

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Physics
Magnifying Glass is basically a

Cylindrical lens
Plano-concave lens
Convex lens
Concave lens

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Physics
Liquids and gases never show

Paramagnetic property
Ferromagnetic property
Diamagnetic property
Electromagnetic property

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Physics
Suppose voltage V is applied across a resistance R. The power dissipated in the resistance is P. Now the same voltage V is applied across a parallel combination of three equal resistors each of resistance R. Then the power dissipated in the second case will be

P
2p/ 3
P/3
3P

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Physics
Instrument used to study the behaviour of a vibrating string is :

Hygrometer
Barometer
Sonometer
Hydrometer

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Physics
Which results in an increase in power?

Doing more work in more time.
Doing more work in less time.
Doing less work in less time.
Doing less work in more time.

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