Combustion can not take place without __________...? Mcqs

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Combustion can not take place without __________...?

(A) Hydrogen
(B) Air

(C) Oxygen
(D) Argon

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The elements in ecosystem recycle through organisms with environment is called ____...?

(A) Food chain
(B) Food web

(C) Chemical cycle
(D) Biogeochemical

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Which one among the following is a hydrocarbon compound...?

(A) Candle wax
(B) Polyurethane

(C) Glycerol
(D) Aspirin

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Sunlight is composed of___________...?

(A) Three colours
(B) six colours

(C) seven colours
(D) eight colours

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The symbolic representation of molecule of a compound is called...?

(A) Equation
(B) Structure

(C) Formula
(D) Reaction

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Which instrument is used for viewing the sun...?

(A) Stroboscope
(B) Heliograph

(C) Solograph
(D) None of these

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Dyne is a unit of _______...?

(A) Quantity
(B) Force

(C) Pressure
(D) Depth

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During the daytime, the air above the land gets heated up its density ____...?

(A) Increase
(B) Decrease

(C) Remain same
(D) Fluctuate

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All are factors affecting enzyme activity except...?

(A) pH
(B) Substrate concentration

(C) Organic solvent
(D) Temperature

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A right rope walker carries a long pole to ______...?

(A) Increase his weight
(B) Raise his centre of gravity

(C) Lower his centre of gravity
(D) Keep his centre of gravity in fixed position

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