Which metal pollute the air of a big city...? Mcqs

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Which metal pollute the air of a big city...?

(A) Copper
(B) Chromium

(C) Lead
(D) Cadmium

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Which term describes the emission of light by a living organism...?

(A) Natural light
(B) Bioluminescence

(C) Illumination
(D) Mimicry

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Cell membrane is composed of _____ layer....?

(A) Single
(B) Double

(C) Triple
(D) None

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Objects that gives out light of their own are said to be...?

(A) Luminous
(B) Non-luminous

(C) Reflective
(D) Illuminated

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Solution is a mixture of ______...?

(A) Mixture and Compound
(B) Element and Mixture

(C) Solvent and Compound
(D) Solute and Solvent

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Photosynthesis occurs during day time because it depends on...?

(A) Day activities
(B) Sunlight

(C) Brightness
(D) None

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Dental mirror is what type of a mirror...?

(A) Convex mirror
(B) Concave mirror

(C) Plane mirror
(D) none of these

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Which of the following scientific instruments is used to measure the atmospheric pressure...?

(A) Odometer
(B) Barometer

(C) Seismograph
(D) Audiometer

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Most of the ozone in the atmosphere is concentrated in the _____________...?

(A) Mesosphere
(B) Troposphere

(C) Stratosphere
(D) ionosphere

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Dioptre is used to measure...?

(A) optical power
(B) luminous intensity

(C) power
(D) distance of heavenly bodies

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