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.Management Sciences
Category: Chemical Environmental Engineering
Presence of _____________ hardness is responsible for the temporary hardness in water?
A. Carbonate
B. Calcium
C. Chloride
D. Sulphate
Limestone powder is injected during pulverised coal burning in boilers to ______________ the flue gases?
A. Reduce SO2 content in
B. Catalytically convert SO2 to SO3 in
C. Increase the dew point of
D. None of these
Infective bacteria in water is killed by the _____________ process?
A. Sterilisation
B. Aeration
C. Disinfection
D. None of these
Sooty and sulphurous smog formed due to combustion of fossil fuels particularly in winter, continues throughout the day and night. When the moist atmospheric air’s water vapor condenses on the solid particles of smoke thereby forming smog (smoke + fog), it causes_________________?
A. Poor visibility due to sky darkening
B. Irritation in eyes
C. Respiratory trouble
D. All A., B. and C.
The lowest layer of atmosphere is known as the_____________________?
A. Stratosphere
B. Troposphere
C. Ionosphere
D. None of these
Turbidity of water is an indication of the presence of__________________?
A. Suspended inorganic matter
B. Dissolved solids
C. Floating solids
D. Dissolved gases
Death may occur, when SO2 concentration in atmospheric air exceeds ______________ ppm?
A. 20
B. 100
C. 400
D. 200
Pick out the wrong statement ?
A. The concentric layer in atmosphere which contains about 70% of the total mass of atmosphere
and characterised by a steady decrease in temperature is called stratosphere
B. Stratosphere is rich in ozone and is located just above the troposphere
C. Troposphere is a turbulent dusty zone containing much of water vapor and clouds
D. The earth’s atmosphere is an envelope of gases extending upto a height of about 200 kms
A man exposed to excessive noise level in the working environment may suffer from____________________?
A. Hearing loss
B. Rupture of ear drum
C. Nervousness & fatigue
D. All A., B. & C.
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