Basic Science Questions for Competitive Exam

Basic Science 

Q.22 Bromine is a

(A) black solid

(B) red liquid

(C) colourless gas

(D) highly inflammable gas

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Q.23 The hardest substance available on earth is

(A) Gold

(B) Iron

(C) Diamond

(D) Platinum

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Q.24 The variety of coal in which the deposit contains recognisable traces of the original plant material is

(A) bitumen

(B) anthracite

(C) lignite

(D) peat

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Q.25 Tetraethyl lead is used as

(A) pain killer

(B) fire extinguisher

(C) mosquito repellent

(D) petrol additive

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Q.26 Which of the following is used as a lubricant?

(A) Graphite

(B) Silica

(C) Iron Oxide

(D) Diamond

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Q.27 The inert gas which is substituted for nitrogen in the air used by deep sea divers for breathing, is

(A) Argon

(B) Xenon

(C) Helium

(D) Krypton

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Q.28 The gases used in different types of welding would include

(A) oxygen and hydrogen

(B) oxygen, hydrogen, acetylene and nitrogen

(C) oxygen, acetylene and argon

(D) oxygen and acetylene

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