environmental engineering MCQs – Page 2

Practise focused environmental engineering questions with marked answers for exam preparation and subject revision.

environmental engineering Mcqs

21. Disinfection efficiency is________________?
0

A. increased at higher pH value of water

B. highest at pH value equal to 7

C. unaffected by pH value of water

D. reduced at higher pH value of water

22. Chlorine demand of water is equal to________________?
0

A. sum of applied and residual chlorine

B. residual chlorine

C. applied chlorine

D. difference of applied and residual chlorine

23. The depression of water table in a well due to pumping will be maximum_______________?
0

A. close to the well

B. re R is the radius of influence

C. at a distance R/2 from the well

D. none of the above

E. at a distance R from the well

24. A sewer that receives the discharge of a number of house sewers is called________________?
0

A. intercepting sewer

B. submain sewer

C. lateral sewer

D. house sewer

25. The type of sewer which is suitable for both combined and separate system is_____________?
0

A. circular sewer

B. horse-shoe type sewer

C. egg shaped sewer

D. semi-elliptical sewer

26. The working conditions in imhoff tanks are_______________?
0

A. aerobic in lower compartment and anaerobic in upper compartment

B. aerobic only

C. anaerobic in lower compartment and aerobic in upper compartment

D. anaerobic only

27. Most of the bacteria in sewage are______________?
0

A. saprophytic

B. parasitic

C. anaerobic

D. pathogenic

28. As compared to higher pH values, the contact period required for efficient chlorination at lower pH values is___________________?
0

A. smaller

B. same

C. none of the above

D. larger

29. Ground water is usually free from________________?
0

A. suspended impurities

B. dissolved impurities

C. both suspended and dissolved impurities

D. none of the above

30. If the total hardness of water is greater than its total alkalinity, the carbonate hardness will be equal to________________?
0

A. total hardness total alkalinity

B. total alkalinity

C. total hardness

D. non carbonate hardness

31. Generally the detention period for grit chambers is kept as_______________?
0

A. 12 hours

B. 2-4 hours

C. 1 minute

D. 5 minutes

32. Alum as a coagulant is found to be most effective when pH range of water is______________?
0

A. 2 to 4

B. 8 to 10

C. 4 to 6

D. 6 to 8

33. The pathogens can be killed by_______________?
0

A. chlorination

B. none of the above

C. nitrification

D. oxidation

34. The ratio of 5 day BOD to ultimate BOD is about_______________?
0

A. 3-Jan

B. 4-Mar

C. 1

D. 2/3

35. Corrosion in concrete sewers is caused by______________?
0

A. dissolved oxygen

B. chlorine

C. nitrogen

D. septic conditions

36. Which of the following compounds is widely used for algae control ?
0

A. sodium sulphate

B. copper sulphate

C. sodium chloride

D. calcium chloride

37. The maximum discharge of a tube-well is about_________________?
0

A. 50 litres/sec

B. 500 litres/sec

C. 1000 litres/see

D. 5 litres/sec

38. Facultative bacteria are able to work in________________?
0

A. presence of oxygen only

B. absence of oxygen only

C. presence of water

D. presence as well as in absence of oxygen

39. Assertion A: Slow sand filters are more efficient in removal of bacteria than rapid sand filters. Reason R : The sand used in slow sand filters is finer than that in rapid sand filters. Select your answer based on the coding system given below?
0

A. Both A and R are true and R is the correct explanation of A

B. Both A and R are true but R is not the correct explanation of A

C. A is true but R is false

D. A is false but R is true

40. The design discharge for the combined sewer system shall be taken as________________?
0

A. rainfall + 2 DWF

B. rainfall + 6 DWF

C. equal to rainfall

D. rainfall + DWF

Previous Next

Showing 21 to 40 of 147 mcqs