Chemical Engineering MCQs

6108 MCQs  (Page 519 of 611)

Attempt Chemical Engineering Quiz
The term Biological Oxygen Demand (BOD) is used in relation to ______________________?
A. Potable water
B. Cooling water
C. Distilled water
D. Industrial effluents
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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 ?
A. Co
B. So2
C. Nox
D. Cfc (chloro fluoro carbons)
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For existence of aquatic life in water, the dissolved oxygen content in it, should not be less than ______________ ppm?
A. 10000
B. 5
C. 500
D. 1000
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Threshold limit value (TLV) i.e., the maximum permissible safe limit of phosgene gas which Hitler used to use to kill his enemies in ‘gas chamber’ is about ______________ ppm?
A. < 1
B. 10-100
C. 100-200
D. 100-1000
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Smog is ______________________?
A. Nothing but black smoke
B. A combination of smoke and fog
C. A liquid particle resulting from vapor condensation
D. A solid particle e.g. fly-ash
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Noise pollution level in a chemical plant is expressed in __________________?
A. Roentgen
B. Decibel
C. Hertz
D. None of these
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Which of the following is not a weightless pollutant ?
A. Spm
B. Thermal pollution
C. Radioactive rays
D. Nosie pollution
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Noise level in a quiet private business office is about _____________ decibels?
A. 25
B. 50
C. 70
D. 85
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Which of the following fine dust removal equipments is the most efficient ?
A. Bag filter
B. Scrubber
C. Electrostatic precipitator
D. Cyclone separator
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Maximum permissible concentration (i.e. TLV) of DDT in public water supply system is _______________ micro gram (μ g)/litre?
A. 22
B. 42
C. 332
D. 1050
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Word of the Day
24 Jul
Untenable
(especially of a position or view) not able to be maintained or defended against attack or objection.
ناقابل مدافعت، غیر مستحکم، جو دلیل سے ثابت نہ ہو سکے

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