A. standard silica scale
B. standard cobalt scale
C. standard platinum scale
D. platinum cobalt scale
Related Mcqs:
- On standard silica scale, the turbidity in drinking water should be limited to_______________?
A. 10 ppm
B. 20 ppm
C. 30 ppm
D. 50 ppm - The velocity of flow does not depend on_______________?
A. grade of sewer
B. length of sewer
C. hydraulic mean depth of sewer
D. roughness of sewer - Standard BOD is measured at________________?
A. 20°C – 1day
B. 25°C- 3day
C. 20°C – 5day
D. 30°C- 5day - 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 major disadvantage of lime soda process of water softening is that_________________?
A. it is unsuitable for turbid and acidic water
B. huge amount of precipitate is formed which creates a disposal problem
C. the effluent cannot be reduced to zero hardness
D. it is unsuitable for softening the water of excessive hardness - The pathogens can be killed by_______________?
A. nitrification
B. chlorination
C. oxidation
D. none of the above - In facultative stabilization pond, the sewage is treated by________________?
A. aerobic bacteria only
B. algae only
C. dual action of aerobic bacteria and anaerobic bacteria
D. sedimentation - 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 disinfection efficiency of chlorine increases by_______________?
1) decreasing the time of contact
2) decreasing the temperature of water
3) increasing the temperature of water
The correct answer is ?
A. only (1)
B. both (1) and (2)
C. both (1) and (3)
D. only (3) - The per capital consumption of a locality is affected by_________________?
1) climatic conditions
2) quality of water
3) distribution pressure
The correct answer is?A. only (1)
B. both (1) and (2)
C. both (1) and (3)
D. all (1), (2) and (3)
