Physics
Danger signals are generally red as red light

Gives comfort to eye
Has lowest velocity
Undergoes least deviation
Is least bright

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Physics
Conservation of energy refers to the fact that

Energy cannot be created or destroyed but can be converted from one form to another
No chemical reaction is 100 percent efficient
The entropy of the universe is always increasing
If you conserve energy you will not be as tired

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

A faulty part of a conventional circuit may be difficult to locate and repair
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

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