chemical engineering chemical environmental engineering chemical engineering MCQs – Page 4

Practise multiple-choice questions from chemical engineering chemical environmental engineering chemical engineering for competitive examinations and subject revision. Review each marked answer and report any item that may be outdated or unclear.

chemical engineering chemical environmental engineering chemical engineering Mcqs

61. In troposphere (the weather domain), the temperature t at height h above the spa level in metres is given by (where, temperature at sea level is 15C and t is in C ?
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A. t = 0.0035h -15

B. t = 15 + 0.0065h

C. t = 15 0.0035h

D. t = 15 0.0065h

62. Hazardous/polluting chemical industries should have an exclusion zone with a green belt and general public access prohibited around it, covering a radius of _____________ metres?
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A. 4000

B. 400

C. 1000

D. 100

63. Smog is ______________________?
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A. Nothing but black smoke

B. A solid particle e.g. fly-ash

C. A combination of smoke and fog

D. A liquid particle resulting from vapor condensation

64. Presence of a certain minimum quantity of fluorine is desirable in potable water to prevent___________________?
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A. Corrosion

B. Water-borne disease

C. Scale formation

D. Dental cavities

65. Which of the following processes is involved in the biochemical treatment of sewage effluents ?
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A. Dehydration

B. Oxidation

C. Fermentation

D. Reduction

66. Worlds worst radioactive pollution was caused by nuclear reactor disaster which occured in ___________________?
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A. Chernobyl (undivided U.S.S.R.)

B. Pennsylvania (U.S.A.)

C. Moscow (U.S.S.R.)

D. Arizona (U.S.A.)

67. Water filtration rate in a slow sand filter ranges from ____________ litres/m2/hr?
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A. 100 to 200

B. 1500 to 2500

C. 10 to 20

D. 4000 to 5000

68. Acute danger to human life (i.e. death) exists, if the concentration of CO2 in atmospheric air exceeds ______________ percent (by volume)?
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A. 1

B. 3

C. 20

D. 7

69. Noise level heard inside a bus in busy city traffic or inside a sub-way train corresponds to about ______________ decibels?
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A. 95

B. 140

C. 75

D. 120

70. 5-200 ?m size particles are called__________________?
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A. Dust

B. Smoke

C. Colloids or aerosols

D. Powder

71. Safe limit called Threshold Limit Value (TLV) of carbon monoxide in atmospheric air is < 50 ppm. The main source of carbon monoxide pollutant in air is the____________________?
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A. Automobiles exhaust

B. Burning of domestic fuel

C. Photochemical reaction in polluted atmosphere

D. Industrial chimney exhaust

72. Very small amount of air pollutants are present in stratosphere also; though most of the atmospheric pollutants are present in the troposphere. Which of the following atmospheric pollutants does not cause the ozone layer depletion in atmosphere at tremendous rate ?
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A. CFC (chloro fluoro carbons)

B. SO2

C. NOx

D. CO

73. The density of the gases (present in air) decreases with increasing altitude to such an extent, that about 70% of the mass of atmospheric air is found in the lower 5 km. of the atmosphere. This lower region of atmosphere is called the_________________?
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A. Troposphere

B. None of these

C. Ionosphere

D. Stratosphere

74. Pick out the wrong statement. A. Caustic embrittlement of boilers metallic parts is caused by high concentration of caustic soda in boiler feed water___________________?
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A. ica in feed water goes on decreasing

B. Dissolved oxygen content in high pressure boiler feed water should be nil

C. Cooling and freezing of water kills the bacteria present in it

D. With increasing boiler operating pressure of steam, the maximum allowable concentration of

75. Noise produced by cooling fans (employed in air cooled heat exchangers or cooling tower) is mainly caused due to the turbulence created by blade passage through air. It can be reduced by use of a slower fan_________________?
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A. With greater number of blades

B. Of increased diameter

C. Both A. & B.

D. Neither A. nor B.

76. Brown spots in fabrics will be caused by washing with water containing large amount of___________________?
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A. Iodine

B. Zinc

C. Iron

D. Bromine

77. Presence of iron and manganese in water causes___________________?
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A. Discoloration of bathroom fixtures

B. None of these

C. Temporary hardness

D. Reduction in its dissolved oxygen content

78. The Killer gas which caused Bhopal gas tragedy in 1984 was________________?
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A. Sulphur dioxide

B. Phosgene

C. Methyl isocyanate (MIC)

D. Carbon monoxide

79. Noise level heard at a distance of about 100 metres from a jet engine with after burner is about _____________ decibels?
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A. 140

B. 170

C. 200

D. 120

80. Which of the following is not a practical method of low level radioactive waste disposal ?
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A. Discharging to atmosphere through tall stacks after dilution

B. Dilution with inert material

C. Filling in steel crates and shooting it off out of earths gravity

D. Disposing off in rivers & oceans

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