Environmental Engineering In Ce - Study Mode

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[#71] Which is a secondary air pollutant?

(A) Photochemical smog

(B) Sulphur dioxide

(C) Nitrogen dioxide

(D) Dust particles

Correct Answer

(A) Photochemical smog

[#72] Which of the following is a secondary air pollutant?

(A) Photochemical smog

(B) Sulphur dioxide

(C) Nitrogen dioxide

(D) Dust particles

Correct Answer

(A) Photochemical smog

[#73] Replenishment of dissolved oxygen in water stream polluted with industrial waste occurs by

(A) Natural aeration of water stream

(B) Photosynthetic action of algae

(C) Both A & B

(D) Neither A nor B

Correct Answer

(C) Both A & B

[#74] The weakest sound that can be heard by a person in a quiet environment is equivalent to __________ decibel.

(A) 1

(B) 5

(C) 10

(D) 20

Correct Answer

(A) 1

[#75] Sulphur dioxide present in the industrial chimney exhaust gases causes

(A) Respiratory & lung disease

(B) Reduction in plant's productivity owing to acid rain

(C) Corrosion of building materials

(D) All of the above

Correct Answer

(D) All of the above