Physics
A barometer is kept inside a bell jar. Air is slowly pumped out of the jar.

The bell jar breaks up
The mercury level does not change
The mercury level starts falling
The mercury level starts rising

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Physics
A dynamo is used to convert

Magnetic energy into mechanical energy
Mechanical energy into electrical energy
Electrical energy into magnetic energy
Electrical energy into mechanical energy

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Physics
Scalar Quantities are

Physical quantities which have magnitude only and no direction
Physical quantities which have no magnitude only and only direction
Physical quantities which have no magnitude and no direction
Physical quantities which have magnitude only and direction

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