chemical engineering chemical environmental engineering chemical engineering MCQs – Page 5

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 Review each marked answer and report any item that may be outdated or unclear.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
81. Presence of volatile compounds like gasoline, oil, alcohol, ether etc. in municipal sewers may cause___________________?
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A. Explosion

B. Non biodegradable foam

C. Undesirable plant growth

D. Corrosion

82. Insufficient washing of sand grains in a rapid sand filter causes__________________?
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A. Air binding

B. Mud balls

C. Shrinkage of filtering media

D. Expansion of filtering media

83. As per the world health organisation (WHO) specification, the maximum permissible concentration (i.e., TLV) of particulate matter in air is _____________ ?g/m3.(?g-microgram)?
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A. 10

B. 90

C. 750

D. 800

84. The upper layer of atmosphere is called the ____________________?
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A. Troposphere

B. Stratosphere

C. None of these

D. Ionosphere

85. Hydrogen ion concentration in distilled water is___________________?
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A. 7 107

B. 10-7

C. 7 10-7

D. 107

86. Green house effect is accentuated by________________?
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A. Increased transportation activity

B. Rapid industrialisation

C. All A., B. and C.

D. Deforestation

87. Lagooning process is mainly a means of the__________________?
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A. Sludge disposal

B. Biological treatment of wastes

C. None of these

D. Reduction of excessive flow in sewers

88. Maximum permissible concentration (i.e. TLV) of DDT in public water supply system is _______________ micro gram (? g)/litre?
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A. 42

B. 1050

C. 22

D. 332

89. Removal of ______________ is accomplished by aeration of water?
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A. Dissolved solids

B. None of these

C. Dissolved gases

D. Suspended solids

90. During sewage treatment, the sewage is subjected to ______________ treatment in Imhoff tank?
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A. Filtration

B. Digestion

C. Sedimentation

D. Both B. and C.
91. The earths atmosphere is an envelope of gases present upto a height of about ______________ kms?
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A. 2000

B. 1000

C. 10

D. 200
92. Presence of nitrates in water in excess of 50 ppm causes________________?
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A. Tooth decay

B. Methemoglobinemia

C. Gastroenteritis

D. Asphyxiation

93. Which of the following is not a source of ozone emission in the atmosphere?
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A. Dermatological photo-therapy equipments

B. Refrigerators

C. High voltage electrical equipments

D. Xerox machines

94. Iron & manganese present as pollutant in water cannot be removed by__________________?
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A. Chlorination

B. Oxidation followed by settling & filtration

C. Ion exchange process

D. Lime soda process or manganese zeolite process

95. Lagoons used for purification of polluted water_______________?
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A. id < 1 mg/litre and BOD = 3.8 mg/litre

B. All A., B. & C.

C. dation ponds

D. Gives an excellent final effluent (with 3 to 4 lagoons arranged in series) having suspended

E. Use micro-organisms/bacteria in presence of dissolved oxygen

F. Are large shallow artificial lakes also known as clarification lakes, maturation ponds or

96. Noise level audible to audience sitting in the 5th row from the stage during a large orchestra show corresponds to about _______________ decibels?
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A. 105

B. 160

C. 185

D. 135
97. Polyvinyl chloride containers are not suitable for storing_________________?
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A. Foodstuffs

B. Metallic powder

C. None of these

D. Woolen clothes

98. High noise levels produced during operation of fans and compressors can be reduced by using__________________?
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A. Mufflers (silencers)

B. Acoustic absorbent

C. Lagging of noisy duct

D. None of these

99. Most efficient and suitable dust removal equipment for removal of fly-ash from flue gas in a thermal power plant is the__________________?
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A. Gravity settling chamber

B. Bag filter

C. Cyclone separator

D. Electrostatic precipitator
100. Removal of ______________ results from the disinfection of water?
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A. Hardness

B. Turbidity

C. Bacteria

D. Odour