Physics
A spherical ball made of steel when dropped in mercury container

Will be partly immersed mercury
Sink in mercury
Will dissolve in mercury
Will be on the surface of mercury

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Physics
Holography is a technique of

Recording a permanent, sharp two diimensional black and white or multicolour photograph
Recording a permanent three dimensional multicolour photograph
Recording a permanent three dimensional photograph of a given single colour or a multicolour
Recording a permanent three dimensional black and white photograph

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Physics
A dynamo is used to convert

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

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