Physics
Steam at 100°C causes more severe burns than water at 100°C because

Steam has no specific heat capacity
Steam has latent heat of vaporisation
Water has no specific heat capacity
Water has latent heat of fusion

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Physics
To prevent damage from lightning, lightning conductors are used on tall structures. The lightning conductor

Should be made of a good conductor like copper with sharp-pointed edges
Can be of any shape
Should be made of a good conductor but can be of any shape
Should be in the form of a vertical rod

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Physics
The earth is a

Good absorber and good radiator of heat
Bad absorber and bad radiator of heat
Good reflector of heat
Non-absorber of heat

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Physics
Holography is a technique of

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

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