Physics
The base of an electric iron is brightly polished mainly

To make it rust-proof
To reduce heat loss by radiation
To make it more durable
To make it smooth and frictionless

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Physics
The nature of fuse wire is

Low resistance and low melting point.
Low resistance and high melting point.
High resistance and low melting point.
High resistance and high melting point.

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Physics
Holography is a technique of

Recording a permanent three dimensional photograph of a given single colour or a multicolour
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

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