Biochem - Water Treatment Flashcards
(42 cards)
1
Q
- The maximum desirable limit Bureau of Indian Standards (BIS) of lead in the drinking water is
A
- 0.05 mg/L
2
Q
- Zeolite softening process removes
A
- Both temporary and permanent hardness of water
3
Q
- Conventional tertiary treatment is
A
- Filtration
4
Q
- The maximum desirable limit (BIS) of total hardness (as CaCO33) in drinking water is
A
- 300 ppm
5
Q
- The chemical oxygen demand (COD) measures the
A
- Amount of oxygen that would be removed from the water in order to oxidize pollution
6
Q
- Hardness of water does not
A
- Have any bad effect in boiler
7
Q
- Permanent hard water may be softened by passing it through
A
- Sodium hexametaphosphate
8
Q
- Zeolite used in zeolite softening process for the treatment of hard water gets exhausted after certain time of usage but can be regenerated by flushing it with
A
- 10% sodium chloride solution
9
Q
- Temporary hardness of water is caused by the presence of
A
- Bicarbonates of calcium and magnesium
10
Q
- Secondary treatment uses ___ to consume wastes.
A
- Microorganisms
11
Q
- Application of quaternary ammonium compounds as sanitizing agents tends to
A
- Increase the percentage of gram(-)ve rods on utensils
12
Q
- Permanent hardness of water is caused by the presence of
A
- Chlorides and sulfates of calcium and magnesium
13
Q
- According to BIS, the maximum permissible limit of dissolved solids in drinking water is
A
- 500 mg/L
14
Q
- Acid used mostly for removal of milk stone
A
- Nitric acid
15
Q
- Which of the following chemical is sometime added in the process of coagulation and flocculation?
A
- Aluminum sulphate
16
Q
- Which of the following physical method is used as germicidal in modern time for the treatment of drinking water?
A
- UV radiation
17
Q
- Sanitizer used specifically for vitreous enamel are
A
- Weak alkali with sodium silicate
18
Q
- The common methods used for disinfection in wastewater treatment plants are
A
- Both (a) and (b)
19
Q
- Inhibitors are used along with sanitizer to
A
- Both (a) and (b)
20
Q
- Sanitizers used for rubber made equipment are
A
- Strong acids
21
Q
- Which of the following substances are commonly used in a filter?
A
- Both (a) and (b)
22
Q
- Biological oxidation processes usually referred as biological treatment, are the most common form of
A
- Secondary treatment
23
Q
- The maximum permissible limit (BIS) of turbidity in drinking water is
A
- 5 NTU
24
Q
- Sedimentation is a physical process used in wastewater treatment to
A
- Remove particles that are more dense than water
25
25. The ultimate source of water is
25. Rain and snow
26
26. Permanent hardness of water may be removed by the addition of
26. Soda ash
27
27. Both temporary and permanent hardness of water can be removed on boiling water with
27. Sodium carbonate
28
28. Lagoons may be characterized as
28. All of these
29
29. Temporary hardness of water may be removed by adding
29. Calcium hydroxide
30
30. The maximum desirable limit (BIS) of mercury in the drinking water is
30. 0.001 mg/L
31
31. From the following sanitizers which one comes under category of surface active agents?
31. Teepol
32
32. The purest form of naturally occurring water is
32. Rain water
33
33. Calgon is used for removal of
33. Permanent hardness of water
34
34. The water being used in dairy industry should contain not more than
34. 5 proteolytic and/or lipolytic organisms per mL
35
35. The activated sludge process consists of returning a portion of the clarifier
35. Influent water entering the reactor
36
36. The activated sludge process is sometime referred as
36. Fluid bed biological oxidation system
37
37. BOD stands for
37. Biochemical oxygen demand
38
38. When temporary hard water is boiled, one of the substances formed is
38. Carbon dioxide
39
39. Zeolite softening process removes both temporary and permanent hardness of water. In this process, the calcium and magnesium present in water are precipitated as
39. Insoluble zeolites
40
40. The methods used for biological treatment are
40. All of these
41
41. Both temporary and permanent hardness of water can be removed by
41. Distillation
42
42. Coliform bacteria in water is an indication of the presence of
42. Human feces
