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PSC PYQ > Environment 2 > Flashcards

Environment 2 Flashcards

1
Q

Which of the following chemicals is used for coagulation?

A

Aluminium sulphate

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2
Q

Alum is

A

Cougulant

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3
Q

In water supply scheme for what purpose the aeration is carried out? (2005,2015,2017) A.

A

To remove taste and odour

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4
Q

To disinfect the swimming pool water, which 9 one is used?

A

Chlorine

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5
Q

. In the case of surface water if pH ranges from 6 to 8, then which is the most suitable coagulant

A

Alum

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6
Q

Air binding in rapid sand filter is encountered

A

There is execcive negative head

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7
Q

Which one of the following forms of chlorine has no disinfecting property?

A

Trichloromin

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8
Q

Ph<4.4

A

Trichloromin

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9
Q

4.4-5.4

A

Dichloromine

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10
Q

Ph 5.4-8.4

A

Both mono dichloromine

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11
Q

Ph>8.4

A

Monichloromine

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12
Q

Oil and grease can be removed by (2010

A

Floatation tanks

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13
Q

Plain chlorination is done after

A

Filtration

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14
Q

The first stage in water treatment is (2010)

A

Sedimentation

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15
Q

The bacterial efficiency of a rapid sand filter

A

90%

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16
Q

Which of the following test reveals the amount of residual chlorine in treated water? (2010

A

• Orthotolidine test

• D.P.D test

Chlorotex test

Starch iodide test

17
Q

Cleaning of slow sand filters is done by

A

Scraping of top layer of 15-30 mm thickness

18
Q

Which of the following will result in appear- ance of residual chlorine in water? (2012

A

Break point chlorination

19
Q

The method of deaning the rapid sand filters

A

Agitation and back washing

20
Q

The strength of chlorine in fresh bleaching powder is

A

30-35%

21
Q

Sedimentation with coagulation is done to

A

To remove fine colloidal particles

22
Q

Which law is applicable for sedimentation of discrete particles in plain sedimentation

A

Stokes law

23
Q

The application of chlorine beyond the stages of break point is known as

A

Super chlorination

24
Q

Which one of the following filters should be recommended for protected rural water sup- ply project

A

Slow sand filter

25
Q

What is defined as the difference between the amount of chlorine added to water and the amount of chlorine remaining at the end of a specified contact period

A

Chlorine demand

26
Q

The settling of particles in sedimentation tank depends upon

A

Both length and breadth

27
Q

The suitable method of distribution for a city with haphazard growth pattern (2016

A

Tree system

28
Q

The amount of residual chlorine left in the public water supply for safety against patho- genic bacteria is

A

0.05-0.5 ppm

29
Q

Which treatment process is carried out after filtration of water?

A

Disinfectantion

30
Q

Maximum detention period of a clarifier used

A

2-3 hr

31
Q

Detention period of Grit chamber is kept as

A

1 minutes

32
Q

In water treatment, rapid gravity filters are adopted to remove

A

Bacteria and colloidal solids

PSC PYQ (5 decks)

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