ENVIRONMENTAL POLLUTION & CONTROL MCQS 26

ENVIRONMENTAL POLLUTION & CONTROL  MCQS 26

1. Which of the following is the most major constituents of air pollutants?
(A) Oxides of Sulphur
(B) Oxides of nitrogen
(C) Carbon monoxide
(D) Hydrogen sulphide
Answer: Option A
2. Noise level heard inside a bus in busy city traffic or inside a sub-way train corresponds to
about __________ decibels.
(A) 75
(B) 95
(C) 120
(D) 140
Answer: Option B

3. Tri-sodium phosphate is used in boiler water treatment to reduce
(A) Turbidity
(B) Caustic embrittlement
(C) Suspended silica
(D) Dissolved oxygen
Answer: Option B

4. A gas is termed as non-toxic, if its maximum permissible concentration (TLV) ranges from
__________ ppm.
(A) 1000 to 2000
(B) 3000 to 6000
(C) 6000 to 9000
(D) 10000 to 100000
Answer: Option D

5. Moist atmospheric air at high temperature (e.g., in summer) having high concentration of sulphur dioxide causes
(A) Fading of dyes on textiles
(B) Corrosion, tarnishing & soiling of metals
(C) Reduced strength of textiles
(D) All (A), (B) and (C)
Answer: Option D

6. 'Pneumoconiosis' is a disease caused by the inhalation of __________ dust.
(A) Coal
(B) Uranium ore 
(C) Iron ore
(D) Lime
Answer: Option A

7. Which of the following acts as a natural source of air pollution?
(A) Forest fire
(B) Deforestation
(C) Volcanic eruption
(D) None of these
Answer: Option C
8. COD of raw municipal sewage may be in the range of about __________ mg/litre.
(A) 1-2
(B) 5-10
(C) 90-120
(D) 1500-2500
Answer: Option C

9. Exposure to small amount of __________ results in high blood pressure & heart disease in human beings.
(A) Hydrogen sulphide
(B) Mercury
(C) Cadmium
(D) Asbestos
Answer: Option C

10. Maximum permissible limit of industrial noise as recommended by World Health Organisation (WHO) is __________ decibels.
(A) 35
(B) 75
(C) 95
(D) 105
Answer: Option B