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Q1. 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
Answer: (C) More and less
Q2. The type of valve which is provided to control the flow of water in the distribution system at street corners and where the pipe lines intersect is
(A) Check valve
(B) Sluice valve
(C) Safety valve
(D) Scour valve
Answer: (B) Sluice valve
Q3. Which of the following compounds is widely used for algae control?
(A) Sodium sulphate
(B) Copper sulphate
(C) Sodium chloride
(D) Calcium chloride
Answer: (B) Copper sulphate
Q4. Which of the following values of pH represents a stronger acid?
(A) 2
(B) 5
(C) 7
(D) 10
Answer: (A) 2
Q5. 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
Answer: (A) 0.25 to 0.35 mm
Q6. The design discharge for the separate sewer system shall be taken as
(A) Equal to dry weather flow (DWF)
(B) 2 × DWF
(C) 3 × DWF
(D) 6 × DWF
Answer: (D) 6 × DWF
Q7. Dissolved oxygen in streams is
(A) Maximum at noon
(B) Minimum at noon
(C) Maximum at midnight
(D) Same throughout the day
Answer: (A) Maximum at noon
Q8. The alum, when added as a coagulant in water
(A) Does not require alkalinity in water for flocculation
(B) Does not affect pH value of water
(C) Increases pH value of water
(D) Decreases pH value of water
Answer:(D) Decreases pH value of water
Q9. 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
Answer: (A) Increases
Q10. The most commonly used sewer under culverts is
(A) Circular brick sewer
(B) Circular cast iron sewer
(C) Semi-elliptical sewer
(D) Horseshoe type sewer
Answer: (A) Circular brick sewer
Q11. If the coli form bacteria is present in a sample of water, then the coli-form test to be conducted is
(i) Presumptive coli-form test
(ii) Confirmed coli-form test
(iii) Completed coli-form test
The correct answer is
(A) Only (i)
(B) Both (i) and (ii)
(C) Both (i) and (iii)
(D) All (i), (ii) and (iii)
Answer: (D) All (i), (ii) and (iii)
Q12. If the coli form bacteria is present in a sample of water, then the coli-form test to be conducted is
(i) Presumptive coli-form test
(ii) Confirmed coli-form test
(iii) Completed coli-form test
The correct answer is
(A) Only (i)
(B) Both (i) and (ii)
(C) Both (i) and (iii)
(D) All (i), (ii) and (iii)
Answer: (D) All (i), (ii) and (iii)
Q13. 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
Answer: (A) Circle method
Q14. The relative stability of a sewage sample, whose dissolved oxygen is same as the total oxygen required to satisfy BOD, is
(A) 1
(B) 100
(C) Infinite
(D) Zero
Answer: (B) 100
Q15. As compared to higher pH values, the contact period required for efficient chlorination at lower pH values is
(A) Smaller
(B) Larger
(C) Same
(D) None of the above
Answer: (A) Smaller
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