ENVIRONMENTAL POLLUTION & CONTROL MCQS 05

ENVIRONMENTAL POLLUTION & CONTROL  MCQS 05

 

1. Which of the following is not a weightless pollutant?
(A) SPM
(B) Thermal pollution
(C) Radioactive rays
(D) Noise pollution
Answer: Option A
 
2. Noise level inside a jet airliner in normal flight is about __________ decibels.
(A) 80
(B) 100
(C) 125
(D) 150
Answer: Option B
 
3. Noise level in a quiet private business office is about __________ decibels.
(A) 25 (B) 50 (C) 70 (D) 85
Answer: Option B
 
4. Aerosols present in atmospheric air may be
(A) Positively charged 
(B) Negatively charged
(C) Neutral
(D) Combination of all (A), (B) & (C)
Answer: Option D
 
5. Which of the following fine dust removal equipments is the most efficient?
(A) Bag filter
(B) Scrubber
(C) Electrostatic precipitator
(D) Cyclone separator
Answer: Option C
 
6. Fresh domestic sewage is __________ in color.
(A) Grey
(B) Dark brown
(C) Red
(D) Black
Answer: Option A
 
7. Pick out the correct statement.
(A) Chemical oxygen demand (COD) is a measure of chemically oxidisable organic matter present in water
(B) COD is determined by oxidising the organic matter present in water with potassium dichromate in cone, sulphuric acid solution at boiling temperature for specified time
(C) COD is related to BOD of a given waste in water but the relationship varies for different wastes. Typically COD of potable water may be 1-2 mg/litre
(D) All (A), (B) and (C)
Answer: Option D
 
8. Polyvinyl chloride containers are not suitable for storing
(A) Foodstuffs
(B) Woolen clothes
(C) Metallic powder
(D) None of these
Answer: Option A
 
9. Maximum permissible concentration (i.e. TLV) of DDT in public water supply system is __________ micro gram (μ g)/litre.
(A) 22
(B) 42
(C) 332
(D) 1050
Answer: Option B
 
10. The resistance of water to the passage of light through it is a measure of the
(A) Turbidity
(B) Color
(C) Hardness
(D) Dissolved gases
Answer: Option A