Tag: biology

Questions Related to biology

In water treatment plants, the gas used to kill germs is

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. Nitrogen

  2. Chlorine

  3. Argon

  4. Krypton

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Correct Option: B

A sewage treatment process, in which a part of decomposer bacteria present in the wastes is recycled into the starting of the process is called a/an:

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. Cyclic treatment

  2. Activated sludge treatment

  3. Primary treatment

  4. Tertiary treatment

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Correct Option: B
Explanation:

Sewage pollution can be prevented by treating sewage, in sewage or effluent treatment plant, before passing into water course. The treatment comprises of primary treatment, secondary treatment and tertiary treatment.
Primary treatment consists of shredding, churning, floatation, screening and sedimentation.
In secondary treatment organic matter is decomposed through sewage fungus by passing sewage through water hyacinth pond, or trickling filter method if passing sewage through thick bed of gravel, or activated sludge method i.e., passing sewage through aerated or oxidation tanks. In activated sludge method, aeration helps in oxidation of sludge or biosolid. The aerobic bacteria can be recycled. The cleared water is now chlorinated with chlorine or perchlorate salts, ozonised or irradiated with ultraviolet light to kill pathogens.
The activated sludge process is a process for treating sewage and industrial wastewaters using air and a biological floc composed of bacteria and protozoa.
The tertiary treatment is physico-chemical treatment for removing turbidity and dissolved substances. Alum, ferric chloride and lime are used for their precipitation.
Therefore, the correct answer is option B.

Chlorine tablet is used to remove .......... from waste water.

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  1. Odour

  2. Dark colour

  3. Bacteria

  4. Both A and B

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Correct Option: D

Secondary sewage treatment is mainly a

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. Biological process

  2. Physical process

  3. Mechanical process

  4. Chemical process

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Correct Option: A
Explanation:

Sewage pollution can be prevented by treating sewage before passing into water course in sewage or effluent treatment plant.

The sewage treatment involves -
Primary treatment, secondary treatment and tertiary treatment. 
Primary treatment consists of shredding, churning, floatation, screening and sedimentation. 
In Secondary treatment the organic matter is decomposed by microorganisms and through sewage fungus by passing through water hyacinth pond, trickling filter method or activated sludge method. Aeration helps in oxidation of sludge. 
Tertiary treatment is a physico-chemical treatment for removing turbidity and dissolved substances.
So, the correct answer is 'Biological process'

Pollution can be controlled by:

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  1. Sewage treatment

  2. Manufacturing electrically operated vehicles

  3. By checking atomic blasts

  4. All of the above

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Correct Option: D
Explanation:

Checking atomic blasts will reduce radioactive pollution. Sewage pollution can be prevented by treating sewage before passing into water course, in sewage treatment plant or effluent treatment plant (ETP). Electrically operated vehicles will control automobile exhaust and improve the air quality in cities.

Which of the following filter is used for filtration of wastewater?

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  1. Sand filter

  2. Grit filter

  3. Cloth

  4. Both A and B

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Correct Option: D

Rainwater can be preserved by building small reservoirs, contour building and

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. wall

  2. roof

  3. dams

  4. house

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Correct Option: C

When harmful substances get mixed with water it becomes

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. polluted

  2. muddy

  3. pure

  4. unclean

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Correct Option: A

Sewage water carry ______ that spread diseases.

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  1. plants

  2. animals

  3. micro organisms

  4. dirt

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Correct Option: C

Which of the following is not a water borne disease?

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. Diarrhoea

  2. Typhoid

  3. Hepatitis

  4. Conjunctivitis

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Correct Option: D