Basic Science Questions for Competitive Exam

General Science Questions and Answers

Q.15 Which of the gas is not known as green house gas?

(A) Methane

(B) Nitrous oxide

(C) Carbon dioxide

(D) Hydrogen

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Q.16 Brass gets discoloured in air because of the presence of which of the following gases in air?

(A) Oxygen

(B) Hydrogen sulphide

(C) Carbon dioxide

(D) Nitrogen

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Q.17 Which of the following is a non metal that remains liquid at room temperature?

(A) Phosphorous

(B) Bromine

(C) Chlorine

(D) Helium

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Q.18 Chlorophyll is a naturally occurring chelate compound in which central metal is

(A) copper

(B) magnesium

(C) iron

(D) calcium

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Q.20 Which of the following is used in pencils?

(A) Graphite

(B) Silicon

(C) Charcoal

(D) Phosphorous

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Q.21 Which of the following metals forms an amalgam with other metals?

(A) Tin

(B) Mercury

(C) Lead

(D) Zinc

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