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D2 > Biochem - Water Treatment > Flashcards

Biochem - Water Treatment Flashcards

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

D2 (22 decks)

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