Tag: personal and public cleanliness

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

Study the following statements about ozone:
(a) It is essential for the breathing of living organisms.
(b) It is used to disinfect water.
(c) It absorbs ultraviolet rays.
(d) Its proportion of air is about 3%. Which of these statements are correct?

  1. (a), (b) and (c)

  2. (b) and (c)

  3. (a) and (d)

  4. All four

Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation
  • Ozone, or trioxygen, is an inorganic molecule with the chemical formula $O _3$. It is a pale blue gas with a distinctively pungent smell.
  • Oxygen is essential for the breathing of living organisms. Hence statement (a) is incorrect.
  • Ozone is a powerful oxidant, stronger than chlorine. Ozone is used to disinfect, deodorize, decolourize and decompose organic substances in water. Hence Statement (b) is correct.
  • The ozone layer or ozone shield is a region of Earth's stratosphere that absorbs most of the Sun's ultraviolet radiation. Hence statement (c) is correct.
  • The proportion of ozone in the air is 0.000004%. Hence Statement (d) Is incorrect.
  • So, the correct answer is '(b) and (c)'.
Multiple choice biology wastewater story personal and public cleanliness who will do this? basics of water pollution

Biogas is produced due to the .................. fermentation of the slurry of animals dung.

  1. Pesticides

  2. Anaerobic

  3. Coal

  4. Methane
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Biogas is produced due to the anaerobic fermentation of the slurry of animals dung.
Microbial conversion of organic matter to methane has become attractive as a method of waste treatment and resource recovery. This process is anaerobic and is carried out by action of various groups of anaerobic bacteria.
Three basic points about this process are that most of the important bacteria involved in biogas production process are anaerobes and slow growing, a greater degree of metabolic specialization is observed in these anaerobic microorganisms and that most of the free energy present in the substrate is found in the terminal product methane. Since less energy is available for the growth of organism, less microbial biomass is produced and, consequently, disposal of sludge after the digestion may not be a major problem.

Multiple choice evs who will do this? personal and public cleanliness basics of water pollution sewage treatment

An example of water-borne disease is 

  1. Scabies

  2. Influenza

  3. Trachoma

  4. Typhoid
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Typhoid is a classic example of a water-borne disease caused by the bacterium Salmonella Typhi, typically spread through contaminated water or food. Scabies is a skin infestation, influenza is respiratory, and trachoma is an eye infection.

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'