Environmental Engineering and Pollution Control Practice Online - Set 04 - ObjectiveBooks

Environmental Engineering and Pollution Control Practice Online - Set 04

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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