Physics
The lift of an aeroplane is caused by

Pascel's law
Law of gravitation
Theorem of continuity
Bernouli's theorem

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Physics
Holography is a technique of

Recording a permanent three dimensional black and white photograph
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

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Physics
Which of the following is not a property of heavy water ?

Freezing point of heavy water is higher than that of ordinary water
Boiling point of heavy water is lower than that or ordinary water
It produces corrosion
Density of heavy water is higher than that of ordinary water

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