Environmental Engineering Multiple Choice Questions and Answers - Set 05 - ObjectiveBooks

Environmental Engineering Multiple Choice Questions and Answers - Set 05

Practice Test: Question Set - 05

1. The per capital consumption of a locality is affected by
    (i) Climatic conditions
    (ii) Quality of water
    (iii) Distribution pressure
    The correct answer is
    (A) Only (i)
    (B) Both (i) and (ii)
    (C) Both (i) and (iii)

2. Select the correct relationship between porosity (N), specific yield (y) and specific retention (R)
    (A) N = y + R
    (B) y = N + R
    (C) R = N + y
    (D) R > (N + y)

3. The maximum permissible limit for fluoride in drinking water is
    (A) 0.1 mg/liter
    (B) 1.5 mg/liter
    (C) 5 mg/liter
    (D) 10 mg/liter

4. The dissolved oxygen level in natural unpolluted waters at normal temperature is found to be of the order of
    (A) 1 mg/liter
    (B) 10 mg/liter
    (C) 100 mg/liter
    (D) 1000 mg/liter

5. The amount of coagulant needed for coagulation of water increases with
    (i) Increase in turbidity of water
    (ii) Decrease in turbidity of water
    (iii) Increase in temperature of water
    (iv) Decrease in temperature of water
    The correct answer is
    (A) (i) and (ii)
    (B) (i)and(iv)
    (C) (ii) and (iii)
    (D) (ii) and (iv)

6. The rate of Alteration of pressure filters is
    (A) Less than that of slow sand filters
    (B) In between the filtration rate of slow sand filters and rapid sand filters
    (C) Greater than that of rapid sand filters
    (D) Equal to that of slow sand filters

7. The treatment of water with bleaching powder is known as
    (A) Pre-chlorination
    (B) Super chlorination
    (C) De-chlorination
    (D) Hypo-chlorination

8. Activated carbon is used for
    (A) Disinfection
    (B) Removing hardness
    (C) Removing odours
    (D) Removing corrosiveness

9. A pipe conveying sewage from plumbing system of a single building to common sewer or point of immediate disposal is called
    (A) House sewer
    (B) Lateral sewer
    (C) Main sewer
    (D) Sub-main sewer

10. The self cleansing velocity for all sewers in India is usually
    (A) Less than 1.0 m/sec
    (B) 1.0 m/sec to 1.2 m/sec
    (C) 1.5 m/sec to 2.0 m/sec
    (D) 3.0 m/sec to 3.5 m/sec

11. The type of sewer which is suitable for both combined and separate system is
    (A) Circular sewer
    (B) Egg shaped sewer
    (C) Horseshoe type sewer
    (D) Semi-elliptical sewer

12. In a BOD test, 1.0 ml of raw sewage was diluted to 100 ml and the dissolved oxygen concentration of diluted sample at the beginning was 6 ppm and it was 4 ppm at the end of 5 day incubation at 20°C. The BOD of raw sewage will be
    (A) 100 ppm
    (B) 200 ppm
    (C) 300 ppm
    (D) 400 ppm

13. Corrosion in concrete sewers is caused by
    (A) Septic conditions
    (B) Dissolved oxygen
    (C) Chlorine
    (D) Nitrogen

14. The main disadvantage of oxidation pond is that
    (A) Large area is required for construction
    (B) Maintenance and operation cost are high
    (C) BOD removal is very low
    (D) None of the above

15. Most of the bacteria in sewage are
    (A) Parasitic
    (B) Saprophytic
    (C) Pathogenic
    (D) Anaerobic

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