Environmental Engineering

Question: Inhalation of silica dust by human being causes
[A].

asphyxiation

[B].

shortness of breath

[C].

tuberculosis

[D].

both(b) & (c)

Answer: Option D

Explanation:

No answer description available for this question.

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

35

[B].

75

[C].

95

[D].

105

Answer: Option B

Explanation:

No answer description available for this question.

Question: Bag filter design is predominantly dependent on gas temperature, as it affects the gas density & viscosity and the selection of filtering material. The pressure drop in a bag filter is
[A].

inversely proportional to viscosity of gas.

[B].

proportional to the viscosity & density of the gas.

[C].

proportional to the pressure of the gas.

[D].

both (b) and (c).

Answer: Option D

Explanation:

No answer description available for this question.

Question: Oceans act as sinks for atmospheric gases including carbon dioxide whose concentration in the atmosphere is increased by the
[A].

forestation

[B].

rain

[C].

green house effect

[D].

vegetation

Answer: Option C

Explanation:

No answer description available for this question.

Question: Automobile exhaust is passed through two compartments catalytic converter employing platinum as catalyst for
[A].

conversion of CO into CO2 in the second compartment.

[B].

conversion of NOx into N2 and NH3 in the first compartment.

[C].

oxidation of unburnt hydrocarbon fuel in the second compartment.

[D].

all (a), (b) and (c).

Answer: Option D

Explanation:

No answer description available for this question.

Question: Workers working in __________ industry are most prone to white lung cancer.
[A].

coal mining

[B].

limestone mining

[C].

textile

[D].

asbestos

Answer: Option C

Explanation:

No answer description available for this question.

Question: Inorganic impurities causing water pollution is
[A].

fats

[B].

carbohydrates

[C].

salts of metals

[D].

protein

Answer: Option C

Explanation:

No answer description available for this question.

Question: The average thickness of ozone layer in stratosphere is about __________ dobson unit (DU).
[A].

20

[B].

230

[C].

750

[D].

1500

Answer: Option B

Explanation:

No answer description available for this question.

Question: Direct reaction of unsaturated hydrocarbons with either NO or NO2 produces an eye irritating pollutant compound known as
[A].

photochemical smog.

[B].

peroxy acetyl nitrate (PAN) or methyl nitrile.

[C].

benzopyrene.

[D].

poly acrylonitrile

Answer: Option B

Explanation:

No answer description available for this question.

Question: In large thermal power stations very fine particulates present in flue gas are removed by
[A].

wet scrubber

[B].

bag filter

[C].

electrostatic precipitators

[D].

dust catcher

Answer: Option C

Explanation:

No answer description available for this question.