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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Diffusion is a _____ process, which does not require energy input....?

(A) Active
(B) Fast

(C) Passive
(D) Slow

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Which of the following is not a mosquito born disease...?

(A) Dengue fever
(B) Malaria

(C) Sleeping sickness
(D) Filariasis

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Which isotope is used to identity efficiency rates of organic and inorganic fertilizers...?

(A) Phosphorus - 32
(B) Carbon - 14

(C) Lead - 210
(D) Nitrogen - 15

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Which mineral is the present in whole wheat, bananas, peas, prunes, oysters, liver, kidney, grains and legumes...?

(A) Copper
(B) Magnesium

(C) Sodium
(D) Iron

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If the material recovers the original dimensions, when an external force is removed, this deformation is known as ______ deformation....?

(A) Inelastic
(B) Permanent

(C) Elastic
(D) Irreversible

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The highest percentage of fat is present in which, organ of fish...?

(A) Meat
(B) Brain

(C) Skeleton
(D) Vessels

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According to many, including the Guinness Book of World Record,________is the world’s rarest mineral...?

(A) Painite
(B) Benitoite

(C) Jadeite
(D) Taaffeite

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A person of which of the following blood groups is called a universal donor...?

(A) O
(B) AB

(C) A
(D) B

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The number shown below the symbol of element is called...?

(A) Mass Number
(B) Atomic Number

(C) Valance Number
(D) Atomic Mass

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