Environmental Engineering for Chemical Engineering MCQ - Set 16 - ObjectiveBooks
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Environmental Engineering for Chemical Engineering MCQ - Set 16

Practice Test: Question Set - 16


1. Pick out the wrong statement.
    (A) Caustic embrittlement of boiler's metallic parts is caused by high concentration of caustic soda in boiler feed water
    (B) Cooling and freezing of water kills the bacteria present in it
    (C) With increasing boiler operating pressure of steam, the maximum allowable concentration of silica in feed water goes on decreasing
    (D) Dissolved oxygen content in high pressure boiler feed water should be nil

2. The type of bacteria which is active in trickling filter during biological treatment of sewage is the __________ bacteria.
    (A) Anaerobic
    (B) Saprophytic
    (C) Aerobic
    (D) Parasitic

3. Foul odour and bad taste of water is removed by treating with
    (A) Alum
    (B) Bleaching powder
    (C) Activated carbon
    (D) Copper sulphate

4. Particulates (< 1μm size) remaining suspended in air indefinitely and transported by wind currents are called
    (A) Fumes
    (B) Mists
    (C) Smoke
    (D) Aerosols

5. World environment day is observed every year on the 5th of
    (A) June
    (B) December
    (C) July
    (D) September

6. Waste/polluted water discharged from electroplating, blast furnace and coal mining industries contain mainly __________ substances.
    (A) Radioactive
    (B) Organic
    (C) Inorganic
    (D) None of these

7. Smoke is produced due to
    (A) Insufficient supply of combustion air and insufficient time for combustion
    (B) Poor quality of fuel and improper mixing of fuel & combustion air
    (C) Poor design & overloading of furnace
    (D) All (a), (b) and (c)

8. Septic tanks are used for the __________ of the deposited solids.
    (A) Separation
    (B) Anaerobic decomposition
    (C) Aerobic decomposition
    (D) None of these

9. Maximum allowable noise exposure limits for a man working for 8 hours a day in a noisy chemical plant is about __________ decibels.
    (A) 20
    (B) 60
    (C) 90
    (D) 120

10. Which of the following is the most detrimental for water used in high pressure boiler?
    (A) Silica
    (B) Turbidity
    (C) Phenol
    (D) Dissolved oxygen

11. Automobile exhaust is passed through two compartments catalytic converter employing platinum as catalyst for
    (A) Conversion of CO into CO2 in the second compartment
    (B) Conversion of NOx into N2 and NH3 in the first compartment
    (C) Oxidation of unburnt hydrocarbon fuel in the second compartment
    (D) All (a), (b) and (c)

12. Atmospheric pollution caused by the exhaust gas of supersonic transport air-crafts is mostly in the atmospheric region called
    (A) Thermosphere
    (B) Stratosphere
    (C) Troposphere
    (D) Mesosphere

13. The widest explosive limit is of __________, thereby making it the most explosive gas.
    (A) Acetylene
    (B) Petrol vapor
    (C) Hydrogen
    (D) Carbon monoxide

14. __________ is removed from water by lime-soda process.
    (A) Foul smell and taste
    (B) Iron and manganese
    (C) Temporary hardness
    (D) Permanent hardness

15. Presence of volatile compounds like gasoline, oil, alcohol, ether etc. in municipal sewers may cause
    (A) Explosion
    (B) Non biodegradable foam
    (C) Undesirable plant growth
    (D) Corrosion

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