Physics
The base of an electric iron is brightly polished mainly

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

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Physics
An integrated circuit is more advantages than a coventional circuit because

They make the electric equipments more reliable and easier for servicing
All listed here
If a part of the integrated circuit fails the entire circuit is simply replaced
A faulty part of a conventional circuit may be difficult to locate and repair

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