Q.

The base of an electric iron is brightly polished mainly -

A. to make it smooth and frictionless
B. to make it rust-proof
C. to reduce heat loss by radiation
D. to make it more durable
Answer» C. to reduce heat loss by radiation
Explanation: Polished surfaces are poor radiators of heat. So loss of heat on that account is reduced and the electric iron remains hotter than otherwise.
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