Multiple Choice Questions Wastewater Treatment - Set 09 - ObjectiveBooks

Multiple Choice Questions Wastewater Treatment - Set 09

Practice Test: Question Set - 09

1. The intensity of rain is expressed in
    (A) cm/minute
    (B) cm/hour
    (C) cm/day
    (D) None of these

2. The ratio of the diameter of a circular section and the side of a square section hydraulically equivalent, is
    (A) 1.095
    (B) 1.085
    (C) 1.075
    (D) 1.065

3. Which one of the following part of human body withstands minimum radiation?
    (A) Thyroid
    (B) Kidneys
    (C) Eyes
    (D) Ovaries/testis

4. Drop manholes are the manholes
    (A) Without entry ladders
    (B) Without manhole covers
    (C) With depths more than 3.5 m
    (D) Having drains at different levels

5. The bottom of the sewage inlet chamber of septic tanks, is provided an outward slope
    (A) 1 in 5
    (B) 1 in 10
    (C) 1 in 15
    (D) 1 in 20

6. If 2% solution of a sewage sample is incubated for 5 days at 20°C and depletion of oxygen was found to be 5 ppm, B.O.D. of the sewage is
    (A) 200 ppm
    (B) 225 ppm
    (C) 250 ppm
    (D) None of these

7. Primary treatment of sewage consists of removal of
    (A) Large suspended organic solids
    (B) Oil and grease
    (C) Sand and girt
    (D) Floating materials

8. The sewers
    (A) Must be of adequate size to avoid over flow
    (B) Must flow under gravity ½ to ¾ full
    (C) Must be laid at least 2 to 3 m deep to collect /water from the basements
    (D) All the above

9. Cement concrete sewers are only suitable if non-scouring velocity is between
    (A) 2.5 to 3.0 m/sec
    (B) 3.0 to 4.0 m/sec
    (C) 3.5 to 4.5 m/sec
    (D) 4.5 to 5.5 m/sec

10. In a fully mechanized composting plant, involves
    (A) Mechanized receipt
    (B) Mechanized segregation
    (C) Mechanized pulverizing of refuse
    (D) All of these

11. The most widely used pump for lifting sewage is
    (A) Centrifugal pump
    (B) Reciprocating pump
    (C) Pneumatic ejector
    (D) Air pressure pump

12. If ‘γwis the unit weight of water, ‘r’ the hydraulic mean depth of the sewer and ‘S’ the bed slope of the sewer, then the tractive force exerted by flowing water, is
    (A) γw r S
    (B) γw r1/2 S
    (C) γw r √S
    (D) γw r2/3 √S

13. Setting out the alignments of sewers may start from
    (A) City
    (B) Out-fall
    (C) Tail end
    (D) Any point

14. The detention time of a circular tank of diameter d and water depth H, for receiving the sewage Q per hour, is
    (A)  (0.011d + 0.785H)/Q
    (B) d (0.022d + 0.085H)/Q
    (C) d (0.785d + 0.011H)/Q
    (D) d (0.285d + 0.011H)/Q

15. Lead acetate test in sewer manhole is done to test the presence of
    (A) Methane gas
    (B) Hydrogen sulphide
    (C) Carbondioxide gas
    (D) Diesel vapours

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