Environmental Engineering Exam Questions - Set 07 - ObjectiveBooks

Environmental Engineering Exam Questions - Set 07

Practice Test: Question Set - 07

1. The detention period and overflow rate respectively for plain sedimentation as compared to sedimentation with coagulation are generally
    (A) Less and more
    (B) Less and less
    (C) More and less
    (D) More and more

2. The effective size of sand particles used in slow sand filters is
    (A) 0.25 to 0.35 mm
    (B) 0.35 to 0.60 mm
    (C) 0.60 to 1.00 mm
    (D) 1.00 to 1.80 mm

3. In chlorination, with the rise in temperature of water, death rate of bacteria
    (A) Increases
    (B) Decreases
    (C) Remains unaffected
    (D) None of the above

4. The method of analysis of distribution system in which the domestic supply is neglected and fire demand is considered is
    (A) Circle method
    (B) Equivalent pipe method
    (C) Electrical analysis method
    (D) Hardy cross method

5. The specific gravity of sewage is
    (A) Much greater than 1
    (B) Slightly less than 1
    (C) Equal to 1
    (D) Slightly greater than 1

6. Which of the following retards the self purification of stream?
    (A) Higher temperature
    (B) Sunlight
    (C) Satisfying oxygen demand
    (D) None of the above

7. Sewerage system is designed for
    (A) Maximum flow only
    (B) Minimum flow only
    (C) Average flow only
    (D) Maximum and minimum flow

8. In facultative stabilization pond, the sewage is treated by
    (A) Aerobic bacteria only
    (B) Algae only
    (C) Dual action of aerobic bacteria and anaerobic bacteria
    (D) Sedimentation

9. A pipe which is installed in the house drainage to preserve the water seal of traps is called
    (A) Vent pipe
    (B) Anti-siphonage pipe
    (C) Waste pipe
    (D) Soil pipe

10. The distribution mains are designed for
    (A) Maximum daily demand
    (B) Maximum hourly demand
    (C) Average daily demand
    (D) Maximum hourly demand on maximum day

11. The type of valve, which is provided on the suction pipe in a tube-well, is
    (A) Air relief valve
    (B) Reflux valve
    (C) Pressure relief valve
    (D) Sluice valve

12. Alkalinity in water is expressed as milligrams per litre in terms of equivalent
    (A) Calcium carbonate
    (B) Magnesium carbonate
    (C) Sodium carbonate
    (D) Calcium hydroxide

13. The length of rectangular sedimentation tank should not be more than
    (A) B
    (B) 2B
    (C) 4B
    (D) 8B
Where ‘B’ is the width of the tank

14. In water treatment, rapid gravity filters are adopted to remove
    (A) Dissolved organic substances
    (B) Dissolved solids and dissolved gases
    (C) Floating solids and dissolved inorganic solids
    (D) Bacteria and colloidal solids

15. Disinfection of water results in
    (A) Removal of turbidity
    (B) Removal of hardness
    (C) Killing of disease bacteria
    (D) Complete sterilisation

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