Practice Test: Question Set - 04
1. Which of the following fine dust removal equipments is the most efficient?
- (A) Bag filter
- (B) Scrubber
- (C) Electrostatic precipitator
- (D) Cyclone separator
2. Fresh domestic sewage is __________ in color.
- (A) Grey
- (B) Dark brown
- (C) Red
- (D) Black
3. 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 oxidizing 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/liter
- (D) All (a), (b) and (c)
4. Polyvinyl chloride containers are not suitable for storing
- (A) Foodstuffs
- (B) Woolen clothes
- (C) Metallic powder
- (D) None of these
5. Maximum permissible concentration (i.e. TLV) of DDT in public water supply system is __________ micro gram (μ g)/liter.
- (A) 22
- (B) 42
- (C) 332
- (D) 1050
6. 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
7. From pollution control point of view, the maximum permissible concentration of sulphur dioxide in atmospheric air is about __________ ppm.
- (A) 5
- (B) 50
- (C) 500
- (D) 5000
8. Carcinogenic air pollutants cause
- (A) Bone decay
- (B) Cancer
- (C) Asphyxiation (suffocation)
- (D) Anemia
9. Fresh sewage is __________ in nature.
- (A) Acidic
- (B) Neutral
- (C) Alkaline
- (D) Highly acidic
10. The destruction of water-borne pathogens is termed as disinfection of water. Which of the following is a water disinfectant?
- (A) Chlorine
- (B) Alkalis
- (C) Benzene hexachloride
- (D) Alkyl benzene sulphonate (ABS)
11. __________ is the process of killing organism in water.
- (A) Coagulation
- (B) Sterilisation
- (C) Disinfection
- (D) Sedimentation
12. The lowest layer of atmosphere is known as the
- (A) Stratosphere
- (B) Troposphere
- (C) Ionosphere
- (D) None of these
13. Salt content in sea water is about __________ percent.
- (A) 0.5
- (B) 1
- (C) 3.5
- (D) 9.05
14. Inhalation of silica dust by human being causes
- (A) Asphyxiation
- (B) Shortness of breath
- (C) Tuberculosis
- (D) Both (b) & (c)
15. High noise levels produced during operation of fans and compressors can be reduced by using
- (A) Mufflers (silencers)
- (B) Acoustic absorbent
- (C) Lagging of noisy duct
- (D) None of these
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