Black smoke coming out of the chimney of a furnace is an indication of the use of ______________ in the furnace?
(A) Low amount of excess combustion air
(B) Large quantity of excess combustion air
(C) Hydrocarbon fuel
(D) Pulverised coal as fuel
Presence of nitrates in water in excess of 50 ppm causes________________?
(A) Methemoglobinemia
(B) Gastroenteritis
(C) Asphyxiation
(D) Tooth decay
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
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
Ethanolamine is an absorbent used for the removal of _____________ from air/gas?
(A) HF
(B) SO2
(C) H2S
(D) Both
Which of the following industries discharge mercury as a pollutant ?
(A) Chloro-alkali industry
(B) Tanneries
(C) Beverage plant
(D) Phosphoric acid plant
The detrimental effect on organism and water quality with temperature rise of aquatic system is the reduction of _____________ of water?
(A) Dissolved oxygen content
(B) Biological oxygen demand
(C) Vapor pressure
(D) All
Which of the following is the most lethal water pollutant ?
(A) Phenol and cyanide
(B) Chlorine
(C) Alkalis
(D) Suspended solids
In large thermal power stations very fine particulates present in flue gas are removed by___________________?
(A) Wet scrubber
(B) Bag filter
(C) Electrostatic precipitators
(D) Dust catcher
Presence of _____________ bacteria in water causes disease like typhoid?
(A) Aerobic
(B) Pathogenic
(C) Anaerobic
(D) Non-pathogenic