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PSC PYQ > Environment 3 > Flashcards

Environment 3 Flashcards

1
Q

What is the turbidity limit for drinking water as per IS 10500-2010?

A

Turbidity should be between 5–10 ppm.
New– 1-5 mg/l

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2
Q

What is the acceptable range for the color of drinking water?

A

The color should be between 5–20 ppm.
New 5 ppm

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3
Q

What is the desirable temperature for drinking water?

A

10-20 degrees

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4
Q

What is the acceptable range of total solids in drinking water?

A

500-2000

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5
Q

What is the permissible pH range for drinking water?

A

6.5-8.5

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6
Q

What is the permissible alkalinity of drinking water?

A

200 mg/l

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7
Q

What is the limit of chlorides in drinking water?

A

Chlorides should be ≤250 mg/l.

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8
Q

What is the permissible level of sulphates in drinking water?

A

Sulphates should be ≤250 mg/l.

New 200

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9
Q

What is the limit for residual chlorine in drinking water?

A

Residual chlorine should be 0.2 ppm.

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10
Q

What is the maximum permissible level of nitrates in drinking water

A

45

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11
Q

What is the permissible level of fluoride in drinking water?

A

1

Less than 1 dental cavity
Greater than 1.5 mottling of teeth

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12
Q

What are the limits for copper (Cu) and manganese (Mn) in drinking water?

A

Both should be ≤0.05 mg/l.

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13
Q

What is the permissible B.O.D (Biochemical Oxygen Demand) for drinking water?

A

The B.O.D should be 0.

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14
Q

Hardness of water is caused by presence of the following in water

A

Calcium and magnesium

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15
Q

If the expected turbidity of water is more than 5000 ppm, the turbidimeter used for analysis

A

Jackson turbidy meter
Greater than 25 mg/l

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16
Q

MPN is

A

Most probable number

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17
Q

What is COD (Chemical Oxygen Demand)?

A

COD is the amount of oxygen required to oxidize both biodegradable and non-biodegradable organic matter.

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18
Q

What is BOD (Biochemical Oxygen Demand)?

A

BOD is the amount of oxygen required to oxidize biodegradable organic matter.

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19
Q

What is the primary use of BOD?

A

BOD is used to find the population equivalent and to determine the strength of industrial wastewater.

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20
Q

What disease can be caused by excessive nitrate in water?

A

Excessive nitrate can cause Methemoglobinemia (blue baby disease).

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21
Q

What gases are produced during anaerobic decomposition?

A

Anaerobic decomposition produces gaseous products such as methane () and carbon dioxide ().

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22
Q

TH>alkanity

A

Ch= alkanity
NCh=. TH - CH

23
Q

Th<alkanity

A

Ch= th
Nch = 0

24
Q

The maximum permissible residual chlorine content for public supplies

A

.1-.2 ppm

25
Q

The maximum permissible residual chlorine content for public supplies

A

.1-.2 ppm

26
Q

Methemoglobinemia is caused if water is supplied with high con

A

Nitrates

27
Q

Methemoglobinemia is caused if water is supplied with high con

A

Nitrates

28
Q

Zeolite process can lower hardness up to

A

0 ppm

29
Q

pH value of drinking water should be in range

A

6.5-8.5

30
Q

The standard unit of colour of water is that which is produced by 1 mg of In one liter of distilled water

A

Platinum cobalt

31
Q

What is the standard unit of turbidity based on?

A

The standard unit of turbidity is based on the turbidity produced by one milligram of finely divided silica in one liter of distilled water.

32
Q

What does NTU stand for, and what is it sometimes referred to as?

A

NTU stands for Nephelometric Turbidity Unit and is sometimes referred to as FTU (Formazin Turbidity Unit) because formazin polymer is used instead of silica.

33
Q

What is the classification of water with a hardness of 0–75 ppm?

A

Water with a hardness of 0–75 ppm is classified as soft water.

34
Q

How is water with a hardness of 75–150 ppm classified?

A

Water with a hardness of 75–150 ppm is classified as moderately hard water.

35
Q

What classification is given to water with a hardness of 150–300 ppm?

A

Water with a hardness of 150–300 ppm is classified as hard water.

36
Q

How is water with a hardness greater than 300 ppm classified?

A

Water with a hardness greater than 300 ppm is classified as very hard water.

37
Q

Disappearance of the pink colour of water in a well due to KMnO4, indicates that the water contains

A

Organic matter

38
Q

For removal of temporary hardness in water

A

Water is boiled

39
Q

Zeolite is

A

Hydrated Aluminosilicate

40
Q

Coagulants are used when turbidity of water more than

A

50 ppm

41
Q
  1. Intensity of colour of water which is accepted for drinking purpose is about
A

5ppm

42
Q

Potassium permanganate is used in water to make it odourless

A
43
Q

pH value of potable water should be (2014)

A

Neutral

44
Q

In public water supply projects, coagulation is to be adopted when the turbidity of water exeed

A

40 ppm

45
Q

Method used for removing permanent hardness

A

Demineralization process
Lime soda process
Zeolite process
Ion exchange process

46
Q

Standard unit of turbidity of water is that which is produced by 1 mg of

A

Fine silica sand

47
Q

Minimum dissolved oxygen present in the wa- ter in order to save aquatic life

A

4 ppm

48
Q

. BOD in potable water

A

0

49
Q

A test used for determining the biological qual ity of drinking water is

A

Coliform test

50
Q

Lime soda process is used for removing

A

Permenent hardness

51
Q

Osmoscope is used for measuring

A

Odour of water

52
Q
  1. The measure of amount of light absorbed or scattered by the suspended material in water
A

Turbidy

53
Q

The commonly used indicator for measuring iron concentration in water is

A

1,10-phenanthroline

54
Q

Biochemical oxygen demand of waste water represents

A

Concentration of biodegradable organic. Matter

PSC PYQ (5 decks)

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