ENVIRONMENTAL POLLUTION & CONTROL MCQS 16

ENVIRONMENTAL POLLUTION & CONTROL  MCQS 16

1. The common pollutant generated in chlor-alkali industry and battery manufacture is
(A) Mercury
(B) Brine
(C) Phosphate
(D) None of these
Answer: Option A

2. Nitrogen oxides (NOx) is not produced in the __________ industry.
(A) Nitric acid making
(B) Nitrogenous fertiliser
(C) Detergent
(D) Any of these
Answer: Option C

3. Permissible safe limit (TLV) of __________ toxic gas is 100-1000 parts per million (ppm).
(A) Highly
(B) Moderately
(C) Extremely
(D) Very extremely
Answer: Option B
4. What are the methods of treatment & disposal of radioactive wastes?
(A) Evaporation & chemical precipitation
(B) Biological methods & adsorption in ion exchange materials
(C) Fixing into a solid mass with cement and sinking deep in the sea
(D) All (A), (B) & (C)
Answer: Option D

5. Deaeration of high pressure boiler feed water is done to reduce
(A) Foaming from boilers
(B) Its dissolved oxygen content
(C) Its silica content
(D) Caustic embrittlement
Answer: Option B

6. Main pollutants released from petroleum refineries is
(A) CO, SO2 & H2S
(B) CO2, NO & SO3
(C) CO2, H2S & NO2
(D) SO3, NO2 & CO2
Answer: Option A

7. Which of the following radioactive wastes emits all α, β & γ rays and hence is the most hazardous of all radioactive emitters?
(A) I-131
(B) Sr-90
(C) Au-198
(D) Ra-226
Answer: Option D

8. In sewage treatment, its sedimentation is speeded up by commonly adding
(A) Hydrochloric acid
(B) Lime
(C) Copper sulphate
(D) Sodium sulphate
Answer: Option B

9. Pick out the correct statement.
(A) Noise from ball mills can be dealt with by fibre glass lined enclosures
(B) Noise from vibrating chutes can be reduced by lining the metallic chute with rubber
(C) Noise of conveyor belt system is reduced by using urethane coated cloth conveyor belts and rubber/plastic covered metallic rollers
(D) All (A), (B) & (C)
Answer: Option D

10. Thermal pollution of water increases its toxicity and oxidation of oxygen demanding waste besides favouring bacterial growth. A rise in water temperature by 10°C, doubles the toxic effects of __________ present in it.
(A) Coal ash
(B) Potassium cyanide
(C) Ortho-xylene
(D) None of these
Answer: Option B