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.Management Sciences
Category: Chemical Environmental Engineering
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?
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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
Suspended solid present in the waste water generated in blast furnace gas cooling and cleaning plant is removed by__________________?
A. Biological oxygen pond
B. Radial settling tank (thickener) using coagulant (lime & ferrous sulphate)
C. Lagoons
D. Filtration
Beyond what concentration of H2S in air, acute danger to human life exists ?
A. 50 ppm
B. 100 ppm
C. 300 ppm
D. 700 ppm
Presence of _____________ bacteria in water causes disease like typhoid?
A. Aerobic
B. Pathogenic
C. Anaerobic
D. Non-pathogenic
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