Environmental Engineering - Section 1

Directions to Solve

Environmental Engineering - Section 1

This is the branch of engineering and here in this section you
will find all the MCQs problems related to environmental engineering.

1.

Pick out the wrong statement.

A.	The concentric atmosphere layer just above troposphere is called stratosphere, which is rich in ozone.
B.	Mesosphere is characterised by very low atmospheric pressure and low temperature.
C.	Troposhere is a dusty zone containing water vapor and clouds.
D.	The radio waves used in the long distance radio communication are reflected back to earth by stratosphere.

Answer: Option D

Explanation:

No answer description available for this question. Let us discuss.

2.

The ratio of oxygen available to the oxygen required for stabilisation of sewage is called the

A.	bacterial stability factor.
B.	relative stability.
C.	biological oxygen demand (BOD).
D.	oxygen ion concentration.

Answer: Option B

Explanation:

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3.

'Pneumoconiosis' is a disease caused by the inhalation of __________ dust.

A.	coal
B.	uranium ore
C.	iron ore
D.	lime

Answer: Option A

Explanation:

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4.

Pick out the wrong statement.

A.	Caustic embrittlement of boiler's metallic parts is caused by high concentration of caustic soda in boiler feed water.
B.	Cooling and freezing of water kills the bacteria present in it.
C.	With increasing boiler operating pressure of steam, the maximum allowable concentration of silica in feed water goes on decreasing.
D.	Dissolved oxygen content in high pressure boiler feed water should be nil.

Answer: Option B

Explanation:

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5.

Most of the atmospheric air pollutants are present in large quantity in

A.	stratosphere
B.	thermosphere
C.	trophosphere
D.	mesosphere

Answer: Option C

Explanation:

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6.

TLV of ozone (O₃) and phosgene (COCl₂) in air is __________ ppm.

A.	0.1
B.	25
C.	100
D.	1000

Answer: Option A

Explanation:

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7.

Inhalation of lead compounds present in the automobile exhausts (using leaded petrol) causes

A.	blood poisoning.
B.	anaemia.
C.	nervous system disorder.
D.	all (a), (b) and (c).

Answer: Option D

Explanation:

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8.

Coal washing waste water containing about 3% suspended solids (comprising of clay, slate, stone etc.) is treated for solid particles removal

A.	by chemical coagulation.
B.	in sedimentation tanks equipped with mechanical scrapper.
C.	in vacuum filter.
D.	in clarifiers.

Answer: Option B

Explanation:

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