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General Science

General Science
The average salinity of sea water is

4%
3.5%
3%
3.5%

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General Science
Permanent hardness of water may be removed by the addition of

Sodium Carbonate
Potassium Permanganate
Alum
Lime

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General Science
What are the soaps?

Esters of heavy fatty acids
Salts of silicates
Mixture of glycerol and alcohols
Sodium or potassium salts of heavier fatty acids

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General Science
Sodium metal is kept under

Kerosene
Petrol
Water
Alcohol

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General Science
The variety of coal in which the deposit contains recognizable traces of the original plant material is

Anthracite
Lignite
Peat
Bitumen

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General Science
Kilowatt is a unit to measure

Work
Electricity
Power
Current

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