Environmental Engineering MCQ Questions - ObjectiveBooks

Environmental Engineering MCQ Questions

Practice Test: Question Set - 10

1. Which of the following values of pH represents a stronger acid?
    (A) 2
    (B) 5
    (C) 7
    (D) 10

2. 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

3. Cleaning is done by
    (i) Scraping and removal in filters slow sand
    (ii) Back washing in slow sand filters
    (iii) Scraping and removal in filters rapid sand
    (iv) Back washing in rapid sand filters
    The correct answer is
    (A) (i) and (ii)
    (B) (ii) and (iii)
    (C) (i) and (iv)
    (D) (ii) and (iv)

4. As compared to cast iron pipes, steel pipes are
    (A) Heavier
    (B) Stronger
    (C) Costlier
    (D) Less susceptible to corrosion

5. The design discharge for the combined sewer system shall be taken as
    (A) Equal to rainfall
    (B) Rainfall + DWF
    (C) Rainfall + 2 DWF
    (D) Rainfall + 6 DWF

6. If Biochemical oxygen demand (BOD) of a town is 20000 kg/day and BOD per capita per day is 0.05 kg, then population equivalent of town is
    (A) 1000
    (B) 4000
    (C) 1,00,000
    (D) 4,00,000

7. The detention period for oxidation ponds is usually kept as
    (A) 48 hours
    (B) 24 hours
    (C) 10 to 15 days
    (D) 3 months

8. The devices which are installed for drawing water from the sources are called
    (A) Aquifers
    (B) Aquiclude
    (C) Filters
    (D) Intakes

9. Residual chlorine in water is determined by
    (A) Starch iodide method
    (B) Orthotolidine method
    (C) Both (A) and (B)
    (D) None of the above

10. The percentage of chlorine in fresh bleaching powder is about
    (A) 10 to 15
    (B) 20 to 25
    (C) 30 to 35
    (D) 40 to 50

11. Sewerage system is usually designed for
    (A) 10 years
    (B) 25 years
    (C) 50 years
    (D) 75 years

12. The characteristics of fresh and septic sewage respectively are
    (A) Acidic and alkaline
    (B) Alkaline and acidic
    (C) Both acidic
    (D) Both alkaline

13. Which of the following unit works in anaerobic conditions?
    (A) Sludge digestion tank
    (B) Sedimentation tank
    (C) Activated sludge treatment
    (D) Trickling filters

14. As compared to shallow wells, deep wells have
    (A) More depth
    (B) Less depth
    (C) More discharge
    (D) Less discharge

15. The rate of filtration in slow sand filters in million litres per day per hectare is about
    (A) 50 to 60
    (B) 100 to 150
    (C) 500 to 600
    (D) 1400 to 1500

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