1501. The dissolved oxygen level in natural unpolluted waters at normal temperature is found to be of the order of________________?
A. 1 mg/litre
B. 10 mg/litre
C. 100 mg/litre
D. 1000 mg/litre
✅ The correct answer is option B.
Civil Engineering
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1502. Orthotolidine test is used for determination of________________?
A. dissolved oxygen
B. residual chlorine
C. biochemical oxygen demand
D. dose of coagulant
✅ The correct answer is option B.
1503. Settling velocity increases with_______________?
A. specific gravity of solid particles
B. size of particles
C. depth of tank
D. temperature of liquid
✅ The correct answer is option C.
1504. The means of access for inspection and cleaning of sewer line is known as_______________?
A. inlet
B. manhole
C. drop manhole
D. catch basin
✅ The correct answer is option B.
1505. Scour valves are provided ______________?
A. at street corners to control the flow of water
B. at every depression and dead ends to drain out the waste water that may collect there
C. at the foot of rising main along the slope to prevent back running of water
D. at every summit of rising mains
✅ The correct answer is option B.
1506. Residual chlorine in water is determined by________________?
A. starch iodide method
B. orthotolidine method
C. both (A) and (B)
D. none of the above
✅ The correct answer is option C.
1507. The amount of residual chlorine left in public water supply for safety against pathogenic bacteria is about______________?
A. 0.01 to 0.05 ppm
B. 0.05 to 0.5 ppm
C. 0.5 to 1.0 ppm
D. 1.0 to 5.0 ppm
✅ The correct answer is option B.
1508. Sewerage system is usually designed for_________________?
A. 10 years
B. 25 years
C. 50 years
D. 75 years
✅ The correct answer is option B.
1509. 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
✅ The correct answer is option C.
1510. A sewer that receives the discharge of a number of house sewers is called________________?
A. house sewer
B. lateral sewer
C. intercepting sewer
D. submain sewer
✅ The correct answer is option B.