Environmental Engineering Important Questions - Set 02 - ObjectiveBooks
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Environmental Engineering Important Questions - Set 02

Practice Test: Question Set - 02

1. If the total hardness of water is greater than its total alkalinity, the carbonate hardness will be equal to
    (A) Total alkalinity
    (B) Total hardness
    (C) Total hardness total alkalinity
    (D) Non carbonate hardness

2. For a given discharge, the efficiency of sedimentation tank can be increased by
    (A) Increasing the depth of tank
    (B) Decreasing the depth of tank
    (C) Increasing the surface area of tank
    (D) Decreasing the surface area of tank

3. Air binding phenomena in rapid sand filters occur due to
    (A) Excessive negative head
    (B) Mud ball formation
    (C) Higher turbidity in the effluent
    (D) Low temperature

4. The suitable method for disinfection of swimming pool water is
    (A) Ultra violet rays treatment
    (B) Lime treatment
    (C) By using potassium permanganate
    (D) Chlorination

5. The commonly used material for water supply pipes, which has the properties of being strong, not easily corroded and long life but is heavy and brittle, is
    (A) Steel
    (B) Cast iron
    (C) Copper
    (D) Reinforced cement concrete

6. The water carriage system of collection of waste product
    (A) Is cheaper in initial cost than dry conservancy system
    (B) Requires treatment before disposal
    (C) Creates hygienic problem
    (D) All of the above

7. The effect of increasing diameter of sewer on the self cleansing velocity is
    (A) To decrease it
    (B) To increase it
    (C) Fluctuating
    (D) Nil

8. The rate of BOD exerted at any time is
    (A) Directly proportional to BOD satisfied
    (B) Directly proportional to BOD remaining
    (C) Inversely proportional to BOD satisfied
    (D) Inversely proportional to BOD remaining

9. Generally the detention period for grit chambers is kept as
    (A) 1 minute
    (B) 5 minutes
    (C) 24 hours
    (D) 12 hours

10. Sludge volume index is defined as the ratio of
    (A) Percentage of sludge by volume to percentage of suspended solids by weight
    (B) Percentage of sludge by volume to percentage of total solids by weight
    (C) Percentage of suspended solids by weight to percentage of sludge by volume
    (D) Percentage of total solids by weight to percentage of sludge by volume

11. The biochemical treatment of sewage effluents is essentially a process of
    (A) Oxidation
    (B) Dehydration
    (C) Reduction
    (D) Alkalinization

12. Which of the following causes a decrease in per capita consumption?
    (A) Use of metering system
    (B) Good quality of water
    (C) Better standard of living of the people
    (D) Hotter climate

13. The suitable method of forecasting population for a young and rapidly increasing city is
    (A) Arithmetical increase method
    (B) Geometrical increase method
    (C) Incremental increase method
    (D) Graphical method

14. Which of the following is not a water borne disease?
    (A) Dysentery
    (B) Cholera
    (C) Typhoid
    (D) Malaria

15. Standard EDTA (ethylene diamine tetra acetic acid) solution is used to determine the
    (A) Hardness in water
    (B) Turbidity in water
    (C) Dissolved oxygen in water
    (D) Residual chlorine in water

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