Which statement is incorrect about chemical reactions...? Mcqs

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Which statement is incorrect about chemical reactions...?

(A) States of matter does not change during chemical reactions
(B) Chemical reactions produce new substances

(C) Chemical reactions occur with the absorption or emission of energy
(D) Chemical reactions may be fast, moderate or slow

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Which element has the most % in human body...?

(A) Oxygen 65%
(B) Calcium 75%

(C) Hydrogen 10%
(D) Carbon 18%

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The chemical used as a fixer in photography is__________...?

(A) sodium sulphate
(B) borax

(C) sodium thiosulphate
(D) ammonium sulphate

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The outermost layer of skin is the__________...?

(A) endodermis
(B) dermis

(C) epidermis
(D) hypodermis

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Name the famous Pakistani scientist who worked under the supervision of Albert Einstein...?

(A) Dr Abdul Qadeer
(B) Riazuddin Siddiqui

(C) Ammar Muhammadi
(D) Dr Abdul Salam

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All matter is made of ___________...?

(A) Air
(B) Water

(C) Vibrations
(D) Atoms

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In an atom, the nucleus when compared to the extra-nuclear part, is _____...?

(A) More significant in volume and heavier in mass
(B) Smaller in volume and lighter in mass

(C) Smaller in volume but heavier in mass
(D) More significant in volume but lighter in mass

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DNA is a very large molecules and consists of units called...?

(A) Amino acids
(B) Nucleotide

(C) Cells
(D) Molecules

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Which is the largest organ in the human body...?

(A) Liver
(B) Heart

(C) Skin
(D) Kidney

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1 Coulomb = ___________ e....?

(A) 6×10-19
(B) 6.25×1018

(C) 1.6×1019
(D) 6.25×10-18

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