The most abundant constituent in Air is ______...? Mcqs

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The most abundant constituent in Air is ______...?

(A) Hydrogen
(B) Oxygen

(C) Nitrogen
(D) Carbon Dioxide

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In which system of units, gas bills are charged...?

(A) SI
(B) CGS

(C) BTU
(D) CNG

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In Daniel cell ____ is used as cathode....?

(A) Zn
(B) Cu

(C) Sn
(D) Pb

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What is responsible for the high resolution of the electron microscope...?

(A) High magnification
(B) Short wavelength of the electron beam

(C) Use of heavy metals strains
(D) Very thin section

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Which one among the following is not an example of pneumatic system...?

(A) Spray gun
(B) Bicycle pump

(C) Vacuum cleaner
(D) Car brake

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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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Most major Tsunamis are produced by earthquakes with hypocenters less than:...?

(A) 30 km
(B) 40 km

(C) 50 km
(D) None of these

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Second layer of Earth’s atmosphere is__________...?

(A) Stratosphere
(B) Mesosphere

(C) Troposphere
(D) Thermosphere

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An undesirable change in the characteristics of air, water and land environment that is harmful to humans and living things is known as...?

(A) Pollutant
(B) Pollution

(C) Climate Change
(D) Global Warning

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Which of the following is the main difference between electromagnets and bar magnets...?

(A) Electromagnets are stronger than bar magnets
(B) Bar magnets are permanent, but electromagnets are temporary

(C) Electromagnets are used in motors, but bar magnets are used in generators
(D) Electromagnets need electricity but bar magnets do not need electricity

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