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.Management Sciences
Category: Chemical Environmental Engineering
Presence of iron and manganese in water causes___________________?
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A. Reduction in its dissolved oxygen content
B. Discoloration of bathroom fixtures
C. Temporary hardness
D. None of these
Which is the most efficient dust removal equipment for removal of submicronic dust particles from blast furnace gas ?
A. Packed scrubber
B. Gravity settling chamber
C. Electrostatic precipitator
D. Hydrocyclone
A ‘body’ which allows the short wavelength incoming solar radiation to enter in, but does not allow long wave length outgoing infra red radiation to escape out is called the________________?
A. Global warming
B. Green house
C. Atmospheric effect
D. Ionosphere
Thermal pollution of water increases its toxicity and oxidation of oxygen demanding waste besides favouring bacterial growth. A rise in water temperature by 10°C, doubles the toxic effects of _____________ present in it?
A. Coal ash
B. Potassium cyanide
C. Ortho-xylene
D. None of these
Ozone is__________________?
A. A primary pollutant
B. A secondary pollutant
C. Impervious to ultra-violet rays
D. Both B. and C.
Maximum permissible residual chlorine in treated water should be ____________ mg/litre?
A. 0.001 to 0.01
B. 0.2 to 0.3
C. 2 to 3
D. 5 to 10
______________ cannot control the noise pollution ?
A. Use of silencers
B. Green house gases
C. Vibration damping
D. Tree plantation
Brown spots in fabrics will be caused by washing with water containing large amount of___________________?
A. Iron
B. Zinc
C. Iodine
D. Bromine
Most efficient and suitable dust removal equipment for removal of fly-ash from flue gas in a thermal power plant is the__________________?
A. Gravity settling chamber
B. Cyclone separator
C. Electrostatic precipitator
D. Bag filter
Noise level in a quiet private business office is about _____________ decibels?
A. 25
B. 50
C. 70
D. 85
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