General Science - General Knowledge Questions and Answers

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The hardest substance available on earth is

Gold

Iron

Diamond

Platinum

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The variety of coal in which the deposit contains recognisable traces of the original plant material is

bitumen

anthracite

lignite

peat

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Tetraethyl lead is used as

pain killer

fire extinguisher

mosquito repellent

petrol additive

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Which of the following is used as a lubricant?

Graphite

Silica

Iron Oxide

Diamond

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The inert gas which is substituted for nitrogen in the air used by deep sea divers for breathing, is

Argon

Xenon

Helium

Krypton

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The gases used in different types of welding would include

oxygen and hydrogen

oxygen, hydrogen, acetylene and nitrogen

oxygen, acetylene and argon

oxygen and acetylene

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The property of a substance to absorb moisture from the air on exposure is called

osmosis

deliquescence

efflorescence

desiccation

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In which of the following activities silicon carbide is used?

Making cement and glass

Disinfecting water of ponds

cutting very hard substances

Making casts for statues

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The average salinity of sea water is

3.5%

2.5%