Tag: protecting our environment

Questions Related to protecting our environment

Which of the following countries does not depend on desalination process for getting fresh water?

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  1. Dubai

  2. Iran

  3. France

  4. Qatar

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Correct Option: C
Explanation:
France does not depend on desalination process for getting fresh water.
Desalination is a process that removes minerals from saline water. More generally, desalination refers to the removal of salts and minerals from a target substance, as in soil desalination, which is an issue for agriculture.
Due to its energy consumption, desalinating sea water is generally more costly than fresh water from rivers or groundwater, water recycling and water conservation.
Desalination is particularly relevant in dry countries such as Australia, which traditionally have relied on collecting rainfall behind dams for water.
Water pollution can be controlled in the multiple ways. It is best controlled by the dilution of water. The pollutants must be treated chemically and must be converted into the non toxic substances. The low level of radioactive wastes in the water is removed by the oxidation of ponds. There are certain chemicals which act on the organic insecticide and are used in the pesticide. There are different techniques which are very helpful in the process of thermal pollution and involve the cooling, evaporation, water cooling; cooling can be wet or dry.

The first rate pollution monitor are

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  1. molluscs

  2. butterflies

  3. honey bee

  4. plants

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Correct Option: A
Explanation:

Freshwater molluscs--snails and bivalves--have been used frequently as bioindicator organisms. With increasing needs for research on contaminant effects in freshwater ecosystems, this kind of biomonitoring is likely to develop further in the future. Molluscs can be used effectively for studies of both organic and inorganic contaminants; this review focuses on studies involving bioaccumulation and toxicity of metals. Two important advantages of snails and bivalves over most other freshwater organisms for biomonitoring research are their large size and limited mobility.

So the correct answer is molluscs.

What is meant by root zone process?

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  1. A control measure to prevent water pollution

  2. A process by which roots of plants are spread on the ground

  3. A control measure to prevent soil pollution

  4. None of these

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Correct Option: A

Sedimentation is a

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  1. Primary water treatment

  2. Secondary water treatment

  3. Tertiary water treatment

  4. Final process

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Correct Option: A

Toxicity of chemical pollutant in water increases, with increase in

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  1. Waste

  2. Water

  3. Temperature

  4. Air

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Correct Option: C
Water pollution can be decreased by treating industrial wastes to yield safe effluents.
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  1. True

  2. False

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Correct Option: A
Explanation:
Water pollution can be decreased by treating industrial wastes to yield safe effluents.
  • Recycling, Renovation, Recharge and Reuse (4R concept) of waste water:
The waste water consisting of domestic sewage industrial effluents, thermal and radioactive pollutants receive some sort of treatment before mixing into water bodies. Urban sewage and sludge, etc, may be recycled and reused to generate cheaper fuel, gas and electricity.
  • Cooling methods:
For preventing thermal pollution such methods are used like cooling waste water effluent, evaporation tower, cooling ponds, dry cooling towers, wet cooling towers etc.
  • Using chemical methods:
Several chemical methods have been devised for the treatment of industrial effluents before discharging them in water bodies.

Therefore, the correct answer is option A.

BOD stands for

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  1. Biochemical oxygen demand

  2. Chemical oxygen demand

  3. Biological optimum demand

  4. Biological oxygen demand

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Correct Option: A
Explanation:

Biochemical oxygen demand (BOD) is the amount of dissolved oxygen required by aerobic biological organisms to break down organic material present in a given water sample at certain temperature over a specific time period. It is used to measure of the amount of organic waste in water.

Therefore, the correct answer is option A.

Water pollution can be controlled by

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  1. Treating sewage or factory wastes to remove harmful organisms and compounds

  2. Using biodegradable fertilizers and pesticides

  3. Both A and B

  4. Electrostatic precipitator

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Correct Option: C
Explanation:

Water pollution is the increase in the concentration of the undesirable harmful compounds in the water resources. The water pollution can be controlled by many ways. The sewage and the factory wastes which contain the pollutants and high number of microbes can be treated before letting the water discharged into water bodies. Biodegradable form of fertilizers and pesticides can be used for the reduction of the soil and water pollution, and eutrophication. 

Thus, the correct answer is option C. 

Biological treatment of water pollution is done with the help of

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  1. Bacteria

  2. Lichens

  3. Fungi

  4. Both A and C

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Correct Option: D
Explanation:

Biological treatment of the waste water can be performed with the use of microbes. The bacteria and fungal cells are commonly used in the treatment of the water through activated sludge. Activated sludge refers to floc of microorganisms including bacterial cells and fungal filaments which are used in the process to break down organic matter into carbon dioxide, water, and other inorganic compounds and help in the clearing of the water. 

Thus, the correct answer is option D.  

Which of these methods is/are used to control water pollution?
(i) Preventing the release of factory wastes into nearby streams.
(ii) Educating society about the dangers of water pollution.
(iii) Using biological control in agricultural areas instead of using pesticides.

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  1. Only (i) and (ii)

  2. Only (ii) and (iii)

  3. Only (i) and (iii)

  4. (i), (ii) and (iii)

Show answer
Correct Option: D
Explanation:

The methods that can be used to control water pollution are:
(i) Avoiding the use of chemical substances freely.
(ii) Educating society about the dangers of water pollution.
(iii) Using biological control in agricultural areas instead of using pesticides.