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

All listed here
They make the electric equipments more reliable and easier for servicing
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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Physics
The wall of a dam is broader at the base

Because streamlining is required
To withstand pressure that increases in a horizontal plane
To withstand pressure that is increased with atmospheric pressure
To withstand pressure that increases with depth

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