1431. Air binding phenomena in rapid sand filters occur due to_________________?
A. excessive negative head
B. mud ball formation
C. higher turbidity in the effluent
D. low temperature
✅ The correct answer is option A.
Civil Engineering
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1432. 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
✅ The correct answer is option A.
1433. Salvage value is sometimes known as _____________________?
A. Scrap value
B. Going value
C. Junk value
D. Second-hand value
✅ The correct answer is option D.
1434. Double filtration is used_______________?
A. to increase the filtration slow sand filters capacity of
B. to increase the filtration rapid sand filters capacity of
C. for isolated buildings like pools, hotels etc swimming
D. all of the above
✅ The correct answer is option A.
1435. The suitable method for disinfection of swimming pool water is________________?
A. ultra violet rays treatment
B. lime treatment
C. by using potassium permanganate
D. chlorination
✅ The correct answer is option A.
1436. Which of the following compounds is widely used for algae control ?
A. sodium sulphate
B. copper sulphate
C. sodium chloride
D. calcium chloride
✅ The correct answer is option B.
1437. 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
✅ The correct answer is option B.
1438. The suitable method of forecasting popu¬lation for a young and rapidly increasing city is_________________?
A. arithmetical increase method
B. geometrical increase method
C. incremental increase method
D. graphical method
✅ The correct answer is option B.
1439. Most of the bacteria in sewage are______________?
A. parasitic
B. saprophytic
C. pathogenic
D. anaerobic
✅ The correct answer is option B.
1440. The ratio of 5 day BOD to ultimate BOD is about_______________?
A. 1/3
B. 2/3
C. 3/4
D. 1.0
✅ The correct answer is option B.