Tag: management of natural resources

Questions Related to management of natural resources

Biogas mainly consists of

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  1. Ethane

  2. $CO _2$

  3. $H _2$

  4. Methane

Show answer
Correct Option: D
Explanation:
Biogas is a form of energy produced from anaerobic decomposition of waste material and organic matter. It is a renewable source of energy and a good alternative in place of fossil fuels which are depleting with time. Biogas is produced by methanogenic bacteria which breakdown organic matter in the absence of oxygen. They produce biogas which is a mixture of gases like methane (CH4), carbon dioxide (CO2) and hydrogen (H2) in different composition as follows:
  • Methane 50- 75%
  • Carbon dioxide 25- 35%
  • Hydrogen 0 -1%
Hence, most of the fraction is of methane.
So, the correct answer is 'Methane'.

The main energy containing components of biogas is

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  1. Methane

  2. Hydrogen

  3. Hydrogen sulphide

  4. Carbon dioxide

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Correct Option: A

Calorific value of biogas is

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  1. $1-2MJ/m^3$

  2. $23-28MJ/m^3$

  3. $11-15MJ/m^3$

  4. $100-120MJ/m^3$

Show answer
Correct Option: B

The land of wind mills is

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  1. U.K.

  2. U.S.A.

  3. Netherland

  4. Himachal Pradesh

Show answer
Correct Option: C
Explanation:
Netherlands (also known as Holland) is known as the land of windmills. Windmills in Netherlands had many historic purposes like they were used to pump water on the land so that farming could be done on it. The wheels of windmills were also used to drain the wetlands and most importantly, windmills are used to generate wind energy.
So, the correct answer is 'Netherland'.

Aquatic plant used in biogas generation is

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  1. Eichhornia

  2. Typha

  3. Potamogeton

  4. Vallisneria

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Correct Option: A

Percentage of methane present in biogas is

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  1. 75%

  2. 60%

  3. 50%

  4. 43 - 45%

Show answer
Correct Option: B
Explanation:

Biogas refers to a mixture of different gases produced by the breakdown of organic matter in the absence of oxygen. Biogas can be produced from raw materials such as agricultural waste, manure, municipal waste, plant material, sewage, green waste or food waste. Biogas is a renewable energy source. In biogas approximately 60% of methane is present.
So, the correct answer is '60%'

Source of energy which does not evolve CO$ _2$ is

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  1. Coal

  2. Oil

  3. Organic compounds

  4. Nuclear energy

Show answer
Correct Option: D
Explanation:

coal, oil & organic compounds contain carbon as the main constituent thus they can evolve carbon dioxide, while nuclear energy will release no carbon dioxide.

So, the correct answer is 'Nuclear energy'

The incorrect statement regarding biogas is

commercial applications management of natural resources unequal distribution of resources protecting our environment rules are for everyone

  1. It predominantly contains methane

  2. Production involves anaerobic digestion of organic wastes

  3. Dung can be used for generation of biogas

  4. It does not contain hydrogen sulphide

Show answer
Correct Option: D
Explanation:

Biogas is a type of fuel. It is a mixture of different gases produced when organic matter breaks down in the absence of oxygen. The organic wastes release many gases primarily methane and carbon-dioxide. It is produced by anaerobic fermentation. It is counted as eco-friendly gas.

So, the correct option is 'It does not contain hydrogen sulphide'.

A biogas plant works to its maximum capacity when

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  1. Conditions are aerobic and sewage is supplied

  2. Conditions are anaerobic and temperature $40^oC$

  3. Conditions are aerobic and temperature $40^oC$

  4. Conditions are anaerobic and sewage is supplied

Show answer
Correct Option: B
Explanation:

Biogas refers to a mixture of different gases produced by the breakdown of organic matter in the absence of oxygen. Biogas is produced by anaerobic digestion with methanogen or anaerobic organisms, which digest material inside a closed system or fermentation of biodegradable materials. There are two key processes: mesophilic and thermophilic digestion which is dependent on temperature. Research in biogas production indicates that the optimal temperature for mesophilic bacteria is around 37°C and around 55°C for thermophilic bacteria.


So, the correct answer is 'Conditions are anaerobic and temperature 40C'.

Electricity is a natural resource.

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  1. True

  2. False

  3. Nither

  4. Either

Show answer
Correct Option: C
Explanation:

 Electricity in its natural form is from lightening. Various natural resources like wind (wind mills), water (turbines), fossil fuels are used to produce electricity. Therefore, electricity is a product obtained using natural resource and its since natural form cannot be easily harnessed  so cannot be nither classified as a natural resource nor a man made product.

So, the correct answer is 'Nither'