The ozone layer is at height of________kilometers from the surface of the Earth...? Mcqs

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The ozone layer is at height of________kilometers from the surface of the Earth...?

(A) 10 to 20
(B) 20 to 30

(C) 30 to 40
(D) 40 to 50

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The unit of Kc for reaction N2 + O2 ⇌ 2NO...?

(A) mol dm^-3
(B) mol^-2 dm^6

(C) mol^-1dm3
(D) No unit

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Enzymes are organic catalysts made up of __________...?

(A) Carbohydrates
(B) Proteins

(C) Nucleic Acid
(D) Fats

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"A chemical compound always contains the same elements combined together in the same proportion or ratio" is the statement of ____...?

(A) Law of Multiple Proportions
(B) Law of Conservation of Mass

(C) Law of Reciprocal Proportions
(D) Law of Constant Composition

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Among the following, which substance is not a compound...?

(A) H2O
(B) Mg

(C) CO2
(D) NaCl

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What are the charges of Proton, Electron, and Neutron respectively...?

(A) Negative, Positive, Neutral
(B) Neutral, Negative, Positive

(C) Positive, Negative, Neutral
(D) Neutral, Positive, Negative

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Which one of the following is not a true snake________ ...?

(A) Blink snake
(B) Glass snake

(C) Sea snake
(D) Tree snake

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Pressure in gases is due to _____...?

(A) Collision of molecules with walls of containers
(B) Vibration of molecules

(C) Rotation of molecules
(D) Electromagnetic attraction between molecules

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When two surfaces move or slide over each other, they experience:...?

(A) Gravitational force
(B) Centripetal force

(C) Electrostatic force
(D) Frictional force

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Which law states that the rate of the effusion of a gas is inversely proportional to the square root of its density...?

(A) Graham’s Law
(B) Gay-Lussac’s law

(C) Boyle’s law
(D) None of these

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