Tag: basics of water pollution

Questions Related to basics of water pollution

Manholes are located at every .......... in the sewerage.

evs sources of water water as nutrient basics of water pollution nutrients and deficiency

  1. 10 to 20 m

  2. 1 to 2 km

  3. 50 to 60 m

  4. 3 km

Show answer
Correct Option: C

Domestic and municipal supplies of water constitutes percentage of total water consumption

evs sources of water water as nutrient basics of water pollution nutrients and deficiency

  1. 19%

  2. 11%

  3. 7%

  4. 1.1%

Show answer
Correct Option: D
Explanation:
  • Drinking water, also known as potable water, is water that is safe to drink or to use for food preparation.
  • The amount of drinking water required to maintain good health varies, and depends on physical activity level, age, health-related issues, and environmental conditions.
  • Domestic and municipal supplies of water constitute 1.1%  percentage of total water consumption.
  • So,the correct answer is '1.1%'.

Which of the chemical is used to freshened up the wastewater?

evs sources of water water as nutrient basics of water pollution nutrients and deficiency

  1. Boric acid

  2. Naphtelene

  3. Chlorine

  4. None of the above

Show answer
Correct Option: C

Many sewer pipelines connect to form the 

evs sources of water water as nutrient basics of water pollution nutrients and deficiency

  1. Drainage

  2. Wastewater body

  3. Sewerage

  4. All of the above

Show answer
Correct Option: C
Explanation:

Sewerage is the infrastructure that conveys sewage from many sewer pipelines. Drainage is an artificial passageway that carries the waste water from the houses. Sewer pipelines are artificial passageway used to carry the sewage and water water from the drainage system. It then carries the waste water to the municipal sewage system or sewerage.   

Thus, the correct answer is option C.

Potable water is the water which is

evs sources of water water as nutrient basics of water pollution nutrients and deficiency

  1. Obtained from a river.

  2. Obtained from a lake.

  3. Pure and fit for drinking.

  4. Used only for washing clothes.

Show answer
Correct Option: C
Explanation:

Potable water is a water which is fit for consumption by humans and other animals. It is also called as drinking water, in a reference to its intended use. Water may be naturally potable, as is the case with pristine springs, or it may need to be treated in order to be safe. In either instance, the safety of water is assessed with tests which look for potentially harmful contaminants.

Therefore, the correct answer is option C.

Maximum use of fresh water is in

evs sources of water water as nutrient basics of water pollution nutrients and deficiency

  1. Agriculture

  2. Domestic use

  3. Industry

  4. Pisciculture

Show answer
Correct Option: A
Explanation:

Maximum use of fresh water is in agriculture. About 70% of the total fresh water is used in agriculture. About 20% is used for industrial purpose. About 10% of the fresh water is used for domestic and municipal use.

Thus, the correct answer is 'Agriculture.'

Study the given differences between primary sludge and activated sludge and select the incorrect ones. 

Primary Sludge Activated sludge
(i) It is sludge formed during primary sewage treatment. It is sludge formed during secondary sewage treatment.
(ii) It possesses flocs of decomposer microbes.  It does not possess flocs of decomposer microbes.
(iii) It does not require aeration.  Formation of activated sludge requires aeration.
(iv) A lot of decomposition occurs during formation of primary sludge.  Very little decomposition occurs during formation of activated sludge. 
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  1. (i) and (ii)

  2. (ii) and (iv)

  3. only (iv)

  4. (ii) and (iii)

Show answer
Correct Option: C
Explanation:

The primar sludge is formed during primary sewage treatment, while activated sludge is a sludge during secondary sewage treatment, little decomposition occurs during primary sludge formation, while lot of decomposition occurs during activated sludge.

So, the correct option is 'only (iv)'.

Select the correct statement regarding activated sludge formed during secondary sewage treatment.

biology wastewater story basics of water pollution sewage treatment wastewater treatment - need and methods personal and public cleanliness who will do this? water borne disease hygiene - a key to healthy life

  1. A small part of it is rapidly pumped back from sedimentation to aeration tank.

  2. It absorbs pathogenic bacteria present in waste water while sinking to the bottom of the settling tank.

  3. A major part of it Is anaerobically digested.

  4. Both (a) and (c)

Show answer
Correct Option: D
Explanation:
A small part of activated sludge is pumped back  from sedimentation to aeration tank. But it dos not absorb pathogenic bacteria.
A major part of activated sludge is anaerobically digested by methanogens.
So, the correct option is 'Both (a) and (c)'

____________  is the first step of sewage treatment.

biology wastewater story basics of water pollution sewage treatment wastewater treatment - need and methods personal and public cleanliness who will do this? water borne disease hygiene - a key to healthy life

  1. Precipitation

  2. Chlorination

  3. Sedimentation

  4. Aeration

Show answer
Correct Option: C
Explanation:

Primary treatment in sewage treatment involves physical removal of particles (large and small) from the sewage through filtration and sedimentation. Initially floating debris is removed by sequential filtration. Then the grit (soil and small pebbles) are removed by sedimentation. 

Study the following statements and select the incorrect ones.


(i) Physical removal of large and small particles through filtration and sedimentation is called primary sewage treatment.
(ii) Secondary sewage treatment is mainly a mechanical process.
(iii) Activated sludge sediment in a sewage treatment plant is a rich source of aerobic bacteria.
(iv) Biogas, commonly called as gobar gas, is pure methane.

biology wastewater story basics of water pollution sewage treatment wastewater treatment - need and methods personal and public cleanliness who will do this? water borne disease hygiene - a key to healthy life

  1. A-(iii), B-(i), C-(iv), D-(ii)

  2. A-(i), B-(iii), C-(iv), D-(ii)

  3. A-(iii), B-(ii), C-(iv), D-(i)

  4. A-(iii), B-(i), C-(ii), D-(iv)

Show answer
Correct Option: B
Explanation:

Secondary treatment is also called biological treatment or microbial degradation. It is mainly a biological process. Biogas is a mixture of gases, containing predominantly methane (50-70%), $CO _2$ (30-40%) and traces of hydrogen, $H _2S$ and nitrogen.