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Quiz 7
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Q.1
Which is the most efficient dust removal equipment for removal of sub-micronic dust particles from blast furnace gas?
Packed scrubber
Gravity settling chamber
Electrostatic precipitator
Hydrocyclone
Q.2
Pick out the wrong statement.
Catalytic converter is fitted in automobiles to reduce carbon monoxide concentration in exhaust emissions
Inhalation of pollutant carbon monoxide results in death by asphyxiation
Sulphur dioxide is the main pollutant emitted from the exhaust of petrol driven automobiles
Decomposition of plants containing chlorophyll is a natural source of carbon monoxide in atmosphere
Q.3
Ambient noise level can be reduced by __________ decibels by planting trees (like coconut, neem etc.) near public utility buildings (like hospitals & schools).
1-2
5-10
15-20
25-30
Q.4
Pick out the one which is not a chemical coagulant.
Aluminium sulphate
Ferrous sulphate
Hydrated lime
Chloramine
Q.5
The widest explosive limit is of __________ , thereby making it the most explosive gas.
Acetylene
Petrol vapor
Hydrogen
Carbon monoxide
Q.6
'Safe limit' called Threshold Limit Value (TLV) of carbon monoxide in atmospheric air is < 50 ppm. The main source of carbon monoxide pollutant in air is the
Industrial chimney exhaust
Automobiles exhaust
Photochemical reaction in polluted atmosphere
Burning of domestic fuel
Q.7
Tolerable limit of nitrogen oxides in air is __________ ppm.
0.1
1
5
25
Q.8
Pick out the wrong statement.
Caustic embrittlement of boiler's metallic parts is caused by high concentration of caustic soda in boiler feed water
Cooling and freezing of water kills the bacteria present in it
With increasing boiler operating pressure of steam, the maximum allowable concentration of silica in feed water goes on decreasing
Dissolved oxygen content in high pressure boiler feed water should be nil
Q.9
Exposure to SO₂ containing chimney gases results in the
Reduction in strength of leather & cloth
Acceleration of corrosion rates of metals
Increased drying & hardening time of paints
All of the above
Q.10
The type of bacteria which is active in trickling filter during biological treatment of sewage is the __________ bacteria.
Anaerobic
Saphrophytic
Aerobic
Parasitic
Q.11
Lead exhausted in the atmosphere by automobiles using leaded petrol (i.e. tetraethyl lead for improving octane number) is a lethal air pollutant which causes
Paralysis of muscles & loss of appetite
Nervous depression
Gastritis & diarrhea
All of the above
Q.12
Which of the following industries discharge mercury as a pollutant?
Chloro-alkali industry
Tanneries
Beverage plant
Phosphoric acid plant
Q.13
Inorganic impurities causing water pollution is
Fats
Carbohydrates
Salts of metals
Protein
Q.14
Infective bacteria in water is killed by the __________ process.
Sterilisation
Aeration
Disinfection
None of these
Q.15
Ozone level is generally found to be depleted in India in the month of
February
July
April
December
Q.16
Pick out the wrong statement.
Biological oxygen demand (B.O.D.) value of a sewerage sample is always lower than its chemical oxygen demand (C.O.D.) value
Environmental pollution by NOx emission is much higher by four stroke petrol engines as compared to the two stroke engines
Temperature in stratosphere rises with increasing altitude
The characteristic of a green house body is that it allows the long wavelength incoming solar radiation to come in but does not allow the short wavelength infra red radiation to escape out of the eart
Q.17
The main type of sludge gas evolved during sewage treatment in Imhoff tank is
CO₂
CH₄
CO
H₂
Q.18
There are five concentric layers within the atmosphere which is differentiated on the basis of temperature. The atmospheric layer which lies close to the earth's surface in which human being along with other organisms live is called troposphere. The rate at which air temperature in the troposphere gradually decreases with height is about __________ °C/km.
0.05
1
6.5
15
Q.19
Pollution by particulate matter emission in the atmosphere does not take place during metal
Grinding
Machining
Cutting
Polishing
Q.20
Pick out the correct statement.
Deforestation helps in controlling the green house effect
Global warming is detrimental for increase in food productivity and may cause flood and cyclone
Lightening discharges are natural source of production of SO₂ & H₂S pollutant
Sulhur dioxide causes death by asphyxiation
Q.21
Which of the following is the most severe air pollutant?
Hydrocarbons
NOx
SO₂
CO
Q.22
In troposphere (the weather domain), the temperature 't' at height 'h' above the spa level in metres is given by (where, temperature at sea level is 15°C and t is in °C.)
t = 15 - 0.0065h
t = 15 + 0.0065h
t = 0.0035h -15
t = 15 - 0.0035h
Q.23
The commonest form of iron & manganese found in ground water as pollutant is in the form of their
Carbonates
Bi-carbonates
Chlorides
Sulphides
Q.24
Bag filter design is predominantly dependent on gas temperature, as it affects the gas density & viscosity and the selection of filtering material. The pressure drop in a bag filter is
Inversely proportional to viscosity of gas
Proportional to the viscosity & density of the gas
Proportional to the pressure of the gas
Both B and C
Q.25
Fresh sewage is __________ in nature.
Acidic
Neutral
Alkaline
Highly acidic
Q.26
Threshold limit value (TLV) of CO in air is __________ ppm.
5
50
2000
5000
Q.27
Global warming may result in
Flood
Cyclone
Decrease in food productivity
All of the above
Q.28
Main pollutant present in automobile exhaust is
CO
CO₂
NO
Hydrocarbons
Q.29
Biological oxidation ponds remove organic matters present in the polluted water by
Using the activities of bacteria and other micro organisms
Aerobic oxidation
Both A & B
Neither A nor B
Q.30
High noise levels produced during operation of fans and compressors can be reduced by using
Mufflers (silencers)
Accoustical absorbent
Lagging of noisy duct
None of these
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