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Quiz 6
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Q.1
Sulphur dioxide present in the industrial chimney exhaust gases causes
Respiratory & lung disease
Reduction in plant's productivity owing to acid rain
Corrosion of building materials
All of the above
Q.2
Disinfection of water is done to remove
Color
Bad taste
Foul odour
Bacteria
Q.3
Which of the following pollutants is absent in the emissions from a fertiliser plant ?
SO₂ & SO₃
NO₂
NH₃
CO
Q.4
Phenolic water generated in coke ovens & by-product plant attached to an integrated steel plant containing phenol in concentration of less than 100 mg/litre can be removed by
Chlorination
Treating in biological oxygen pond
Chemical coagulation
None of these
Q.5
A man exposed to excessive noise level in the working environment may suffer from
Hearing loss
Rupture of ear drum
Nervousness & fatigue
All of the above
Q.6
Which of the following is not a practical method of low level radioactive waste disposal?
Dilution with inert material
Discharging to atmosphere through tall stacks after dilution
Disposing off in rivers & oceans
Filling in steel crates and shooting it off out of earth
Q.7
Which of the following sources is responsible for maximum air pollution?
Industrial chimney exhaust
Forest fire
Automobiles exhaust
Photochemical oxidation of organic matter
Q.8
Which is a secondary air pollutant?
Photochemical smog
Sulphur dioxide
Nitrogen dioxide
Dust particles
Q.9
Which of the following is a secondary air pollutant?
Photochemical smog
Sulphur dioxide
Nitrogen dioxide
Dust particles
Q.10
Siderosis is a disease caused by the inhalation of __________ dust.
Coal
Silica
Iron
None of these
Q.11
Tri-sodium phosphate is used in boiler water treatment to reduce
Turbidity
Caustic embrittlement
Suspended silica
Dissolved oxygen
Q.12
Water effluent generated in printing industry is decolourised by
Ion exchange technique
Reverse osmosis
Electrolytic decomposition
Adsorption
Q.13
There are thirteen metals which are treated as pollutants. Which of the following metals is not a pollutant?
Mercury
Arsenic
Aluminium
Lead
Q.14
Which is the most widely used coagulant for the treatment of turbid water?
Alum (aluminium sulphate)
Lime
Ferric chloride
Sodium aluminate
Q.15
Exposure to small amount of __________ results in high blood pressure & heart disease in human beings.
Hydrogen sulphide
Mercury
Cadmium
Asbestos
Q.16
Presence of a certain minimum quantity of flourine is desirable in potable water to prevent
Dental cavities
Scale formation
Water-borne disease
Corrosion
Q.17
Replenishment of dissolved oxygen in water stream polluted with industrial waste occurs by
Natural aeration of water stream
Photosynthetic action of algae
Both A & B
Neither A nor B
Q.18
'Pneumoconiosis' is a disease caused by the inhalation of __________ dust.
Coal
Uranium ore
Iron ore
Lime
Q.19
Water filtration rate in a rapid sand filter ranges from __________ kilolitres/m²/hr.
0.1 to 1
3 to 6
10 to 15
15 to 20
Q.20
Lung cancer & DNA breakage are the major ill effects of excessive ozone exposure to human beings. Ozone layer depletion in the atmosphere is mainly caused by the presence of
CO₂
SO₂
Hydrocarbons
CFC (chloro fluoro carbon)
Q.21
Scale formation in boiler is controlled by
Preheating of feed water
Reduction in hardness, silica & alumina in feed water
Keeping the pH value of feed water just below 7
Eliminating H₂S in feed water
Q.22
Corrosion in boilers can be prevented by
Deaeration of feed water
Enhancing pH of feed water by adding alkali
Feeding sodium sulphite or hydrazine phosphate to the boilers, which combines with oxygen and prevents corrosion
All of the above
Q.23
Iron & manganese present as pollutant in water can not be removed by
Ion exchange process
Oxidation followed by settling & filtration
Lime soda process or manganese zeolite process
Chlorination
Q.24
Which of the following is the most widely used disinfectant in water treatment?
Chlorine
Irradiation of water by ultraviolet light
Cation exchanger
Coagulation
Q.25
Direct reaction of unsaturated hydrocarbons with either NO or NO₂ produces an eye irritating pollutant compound known as
Photochemical smog
Peroxy acetyl nitrate (PAN) or methyl nitrile
Benzopyrene
Poly acrylonitrile
Q.26
Which of the following is an adsorbant for removal of nitrogen oxides from gas/air?
Active carbon
Silica gel
Bog iron (iron oxide)
Pulverised limestone
Q.27
Green house effect is accentuated by
Deforestation
Rapid industrialisation
Increased transportation activity
All of the above
Q.28
Death may occur, when SO₂ concentration in atmospheric air exceeds __________ ppm.
20
100
400
200
Q.29
Inhalation of silica dust by human being causes
Asphyxiation
Shortness of breath
Tuberculosis
Both B & C
Q.30
Pick out the correct statement.
Noise from ball mills can be dealt with by fibre glass lined enclosures
Noise from vibrating chutes can be reduced by lining the metallic chute with rubber
Noise of conveyor belt system is reduced by using urethane coated cloth conveyor belts and rubber/plastic covered metallic rollers
All of the above
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