Environmental Engineering Quiz Questions and Answers - Set 04 - ObjectiveBooks

Environmental Engineering Quiz Questions and Answers - Set 04

Practice Test: Question Set - 04


1. The depression of water table in a well due to pumping will be maximum
    (A) At a distance R from the well
    (B) Close to the well
    (C) At a distance R/2 from the well
    (D) None of the above
Where ‘R’ is the radius of influence

2. Ground water is usually free from
    (A) Suspended impurities
    (B) Dissolved impurities
    (C) Both suspended and dissolved impurities
    (D) None of the above

3. On standard silica scale, the turbidity in drinking water should be limited to
    (A) 10 ppm
    (B) 20 ppm
    (C) 30 ppm
    (D) 50 ppm

4. The settling velocity of a particle in a sedimentation tank increases if
    (A) Particle size is decreased
    (B) The surface area of tank is increased
    (C) The depth of tank is decreased
    (D) None of the above

5. As compared to rapid sand filters, slow sand filters give
    (i) Slower filtration rate
    (ii) Higher filtration rate
    (iii) Lesser efficiency in removal of bacteria
    (iv) Higher efficiency in removal of bacteria
    The correct answer is
    (A) (i) and (ii)
    (B) (ii) and (iii)
    (C) (i) and (iv)
    (D) (ii) and (iv)

6. Chlorine demand of water is equal to
    (A) Applied chlorine
    (B) Residual chlorine
    (C) Sum of applied and residual chlorine
    (D) Difference of applied and residual chlorine

7. In lime-soda process
    (A) Only carbonate hardness is removed
    (B) Only noncarbonated hardness is removed
    (C) Lime reduces the carbonate hardness and soda-ash removes the non-carbonate hardness
    (D) Lime reduces the non-carbonate hardness and soda-ash removes the carbonate hardness

8. Which of the following methods of analysis of water distribution system is most suitable for long and narrow pipe system?
    (A) Circle method
    (B) Equivalent pipe method
    (C) Hardy cross method
    (D) Electrical analysis method

9. Which of the following sewers is preferred for combined system of sewage?
    (A) Circular sewer
    (B) Egg shaped sewer
    (C) Rectangular sewer
    (D) None of the above

10. An egg shaped section of sewer
    (A) Is economical than circular section
    (B) Provides self cleansing velocity at low discharges
    (C) Is more stable than circular section
    (D) Is easy to construct

11. Sewage treatment units are normally designed for
    (A) 5 - 10 years
    (B) 15 - 20 years
    (C) 30 - 40 years
    (D) 40 - 50 years

12. The means of access for inspection and cleaning of sewer line is known as
    (A) Inlet
    (B) Manhole
    (C) Drop manhole
    (D) Catch basin

13. The maximum efficiency of BOD removal is achieved in
    (A) Oxidation pond
    (B) Oxidation ditch
    (C) Aerated lagoons
    (D) Trickling filters

14. For the same solid content, if the quantity of sludge with moisture content of 98% is X, then the quantity of sludge with moisture content of 96% will be
    (A) X/4
    (B) X/2
    (C) X
    (D) 2X

15. The process of lagooning is primarily a means of
    (A) Reducing the excessive flow in sewers
    (B) Disposing of sludge
    (C) Increasing the capacity of storage reservoirs
    (D) Increasing flow of sewage through imhoff tanks

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