Brass gets discolored in air because of the presence of which of the following gases in air:...? Mcqs

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Brass gets discolored in air because of the presence of which of the following gases in air:...?

(A) Carbon dioxide
(B) Hydrogen sulfide

(C) Nitrogen
(D) Oxygen

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Abdul Qadeer Khan died on ______...?

(A) 09 October 2021
(B) 10 October 2021

(C) 11 October 2021
(D) 13 October 2021

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It is not advisable to sleep under a tree at night because of the release of:...?

(A) more oxygen
(B) less oxygen

(C) Carbon dioxide
(D) Carbon monoxide

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Which planet revolves in Clockwise rotation around sun and seen from earth?...?

(A) Jupiter
(B) Venus

(C) Mars
(D) None of these

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The element required for solar energy conversion is:...?

(A) Silicon
(B) Germanium

(C) Uranium
(D) None of these

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Which is the heaviest metal:...?

(A) Iron
(B) Mercury

(C) Nickel
(D) Platinum

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The process by which a substance absorbs moisture upon exposure to atmosphere is called:...?

(A) Deliquescence
(B) Efflorescence

(C) Dehydrogenation
(D) Desalination

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What is Nuclear Fission...?

(A) Atom splits into two masses
(B) Small atoms join each other

(C) Helium broken into proton and electron
(D) All of these

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Examples of magnetic materials are_______...?

(A) Iron, Nickel and Cobalt
(B) Gold, Aluminum and Copper

(C) Earth
(D) All of these

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Vaccination was discovered by...?

(A) Galileo
(B) Edward Jenner

(C) Baird
(D) Roentgen

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