Brass gets discoloured in air because of the presence of which of the following gases in air ________ ...? Mcqs

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

(A) Carbon dioxide
(B) Oxygen

(C) Nitrogen
(D) Hydrogen sulphide

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Lake, sea, wetland, river, ocean, pond is/are an examples of...?

(A) Water Environments
(B) Land Environments

(C) Both A and B
(D) None

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The lowest temperature in laboratory thermometer is...?

(A) 10°C
(B) 0°C

(C) 100°C
(D) -10°C

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When was the polio vaccine first launched in Pakistan...?

(A) 1961
(B) 1974

(C) 1988
(D) 1994

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The speed of sound in air at sea level is approximately____________...?

(A) 300 meter per second
(B) 320 meter per second

(C) 340 meters per second
(D) 370 meter per second

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Electrostatic precipitator is used to control...?

(A) Air pollution
(B) Water pollution

(C) Solid waste
(D) Noise pollution

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Which of the following is a component of soap...?

(A) Sodium sulphate
(B) Sodium stearate

(C) Sodium chloride
(D) Sodium nitrate

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Joint in which bones are joined together by fibrous tissues is called _____________ ...?

(A) Fibrous joint
(B) Cartilaginous joint

(C) Synovial joint
(D) Ball and socket joint

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CH3-CH2- is _____ radical....?

(A) Methyl
(B) Ethyl

(C) n-propyl
(D) Isopropyl

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A part of maize seed that contains stored food is called...?

(A) Embryo
(B) Endosperm

(C) Seed coat
(D) Cotyledon

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