Tag: basics of water pollution

Quizzes (0) Questions (113)

Questions Related to basics of water pollution

Multiple choice biology wastewater story personal and public cleanliness who will do this? basics of water pollution

Biological control during sewage treatment is observed in 

  1. Aerating tanks

  2. Settling tanks

  3. Anaerobic sludge digesters

  4. Primary treatment
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

During secondary treatment, the sewage water is aerated and added with microorganisms like the bacteria and protozoa, these microorganisms degrade organic wastes in presence of oxygen
Multiple choice biology wastewater story personal and public cleanliness who will do this? basics of water pollution water borne disease hygiene - a key to healthy life

Sewage is mainly a

  1. liquid waste

  2. solid waste

  3. gaseous waste

  4. mixture of liquid waste and organic matter
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Sewage is defined as wastewater that contains a mixture of liquid waste from households and organic matter, such as human excreta and food scraps. It is not purely liquid or solid, but a suspension of materials in water.

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

Aeration process change the odour of wastewater.

  1. True

  2. False
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Aeration is mixing of oxygen into the water. It increases the microbial growth in the water. The microbial growth acts on the organic matter and creates flocs which settle. The degradation of organic matter leads to the change in the pH of the water and production of gases like hydrogen sulfide which creates an odour.

So, the correct answer is option B.

Multiple choice biology wastewater story personal and public cleanliness who will do this? basics of water pollution

What are characteristics of 'domestic' wastewater?

  1. Grey color, musty odour

  2. Blue color, odourless

  3. Green color, musty odour

  4. All of Above
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Domestic wastewater typically appears grey in color due to suspended and dissolved impurities from household activities and has a characteristic musty or stale odor resulting from microbial decomposition.

Multiple choice zoology environmental science personal and public cleanliness who will do this? basics of water pollution

If large quantities of domestic sewage is continuously emptied into a small stream, it leads to

  1. depletion of oxygen content in stream water

  2. depletion of nutrients in the stream water

  3. enrichment of oxygen content in stream water

  4. increase in the total amount of life in the stream water.
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

If large quantities of domestic sewage are continuously emptied into a small stream, it leads to depletion of oxygen content in stream water as microbes that develop to degrade the organic matter shall consume the oxygen and reduces its amount.

So the correct option is 'depletion of oxygen content in stream water'

Multiple choice biology hygiene - a key to healthy life water borne disease basics of water pollution sewage treatment

when children play bare-footed in pools of dirty water and flood water,they may suffer from

  1. Leptospirosis and bilharzia

  2. Malaria ,amoebic dyscentry and leptospirosis

  3. Bilharzia,infective hepatitis and diarrhoea

  4. Guineaworm infection,elephantiasis and amoebic dyscentry
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

  • Schistosomiasis, also known as snail fever and bilharzia is a disease caused by parasitic flatworms called schistosomes. The disease is spread by contact with fresh water contaminated with the parasites. The disease is especially common among children in developing countries, as they are more likely to play in contaminated water.
  • Hepatitis is an inflammation of the liver tissue. Hepatitis is majorly caused by the virus known as infective hepatitis. Infective hepatitis is mainly spread by contaminated food and water.
  • Diarrhoea is the condition of having at least three loose or liquid bowel movements each day. Diarrhoea lasts for a few days and can result in dehydration due to fluid loss. These infections are often acquired from food or water that has been contaminated by faeces, or directly from another person who is infected.
  • Hence, these diseases may occur when children play bare-footed in pools of dirty water and flood water.
So, the correct answer is 'Bilharzia, infective hepatitis and diarrhoea'.