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Doctors Medicines MCQs Q&A

  1. Storage
  2. Filtration
  3. Disinfection
  4. Bolling
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1 Answers

Option 1 : Storage

Concept-

Storage of water for purification:

  • Water is drawn out from the source and stored in the reservoir. The reservoir may be natural or artificial.

Storage helps in two ways:

  • Provides a reserve of water from which further pollution is excluded.
  • A considerable amount of purification occurs as a result of storing water.

Physical quality improvement:

  • By mere storage, 90% of suspended impurities settle down in 24 hours due to gravity
    Water becomes clearer physically.
  • This allows penetration of light which further improves water quality (hence reduces the load on the filter)

Chemical:

  • Certain chemical changes occur during storage.
  • The aerobic bacteria oxidize the organic matter present in the water with the aid of dissolved oxygen. This results in the reduction of free ammonia and a Rise in Nitrates.

Biological changes:

  • This is one of the greatest benefits of storage.
  • The pathogenic organisms gradually die out.
  • It has been seen that when river water is stored the total bacterial count drops by as much as 90% in 5 – 7 days
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Related Questions

In the question below is given a statement followed by two courses of actions numbered I and II. A course of action is a step or administrative decision to be taken for improvement, follow-up or further action in regard to the problem, policy, etc. On the basis of the information given in the statement to be true, then decide which of the suggested courses of action logically follow(s) for pursuing. Statement: The wastage of water is discouraged by all the nations across the globe. The water table is depleting and it is claimed that by 2050, there will be an acute shortage of water. Measures to harvest rainwater are being encouraged.  Courses of action: I. The amount of water to be used in households should be limited by all governments.  II. All domestic households should be advised to install rainwater harvesting systems and reuse of water should be promoted.?
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