ENVIRONMENTAL POLLUTION & CONTROL MCQS 24

ENVIRONMENTAL POLLUTION & CONTROL  MCQS 24

1. 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
Answer: Option C

2. 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)
Answer: Option D

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

4. 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
Answer: Option C

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

6. 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)
Answer: Option D

7. 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
Answer: Option B

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

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

10. 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
Answer: Option A