Environmental Engineering In Ce - Study Mode

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[#141] From pollution control point of view, the maximum permissible concentration of sulphur dioxide in atmospheric air is about __________ ppm.

(A) 1

(B) 5

(C) 50

(D) 500

Correct Answer

(B) 5

[#142] Noise pollution level in a chemical plant is expressed in

(A) Roentgen

(B) Decibel

(C) Hertz

(D) None of these

Correct Answer

(B) Decibel

[#143] Maximum permissible limit of industrial noise as recommended by World Health Organisation (WHO) is __________ decibels.

(A) 35

(B) 75

(C) 95

(D) 105

Correct Answer

(B) 75

[#144] Fluorosis is caused due to the presence of excessive amount of __________ in drinking water.

(A) Mercury

(B) Lead

(C) Fluoride

(D) Arsenic

Correct Answer

(C) Fluoride

[#145] Smog is not formed due to the presence of __________ in the atmosphere.

(A) SO 2

(B) NO x

(C) CO 2

(D) Any of these

Correct Answer

(C) CO 2