Physics
The density of the liquid when heated

Does not change
Decreases
May increase of decrease depending on pressure
Increases

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Physics
Why does the sea appear blue in colour?

Refraction of the sun light
Scattering of the sunlight by water molecules
Reflection of the sun light from water surface
Interference of the sun light from water surface

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

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

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