A. 1 ppm
B. 4 ppm
C. 10 ppm
D. 40 ppm
✅ The correct answer is option B.
Civil Engineering
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1472. 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)
✅ The correct answer is option A.
1473. The minimum and maximum diameters of sewers shall preferably be_________________?
A. 15 cm and 100 cm
B. 15 cm and 300 cm
C. 30 cm and 450 cm
D. 60 cm and 300cm
✅ The correct answer is option B.
1474. Disinfection efficiency is________________?
A. reduced at higher pH value of water
B. unaffected by pH value of water
C. increased at higher pH value of water
D. highest at pH value equal to 7
✅ The correct answer is option A.
1475. The rate of BOD exerted at any time is_____________?
A. directly proportional to BOD satisfied
B. directly proportional to BOD remain-ing
C. inversely proportional to BOD satisfied
D. inversely proportional to BOD re-maining
✅ The correct answer is option B.
1476. Most suitable section of sewer in separate sewage system is________________?
A. rectangular section
B. circular section
C. standard form of egg shaped sewer
D. modified egg shaped section
✅ The correct answer is option B.
1477. Laying of sewers is usually done with the help of________________?
A. a theodolite
B. a compass
C. sight rails and boning rods
D. a plane table
✅ The correct answer is option C.
1478. The chemical most commonly used to increase speed of sedimentation of sewage is_______________?
A. sulphuric acid
B. copper sulphate
C. lime
D. sodium permanganate
✅ The correct answer is option C.
1479. The correct relation between theoretical oxygen demand (TOD), Biochemical oxygen demand (BOD) and Chemical oxygen demand (COD) is given by_______________?
A. TOD>BOD>COD
B. TOD>COD>BOD
C. BOD>COD>TOD
D. COD>BOD>TOD
✅ The correct answer is option B.
1480. 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
✅ The correct answer is option C.