Tag: protecting our environment

Questions Related to protecting our environment

Biogas predominantly comprises

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  1. $CH _4, N _2$ and $H _2$

  2. $CH _4$ and CO

  3. $CH _4$ and $CO _2$

  4. $CH _4$ and $NO _3$

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Correct Option: C

Biogas contains

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  1. $50-70\%$ methane

  2. $30-40\%$ methane

  3. Traces of methane

  4. $80-95\%$ ethane

Show answer
Correct Option: A
Explanation:
Biogas is a form of energy produced from anaerobic decomposition of waste material and organic matter. Biogas 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%
Apart from these gases, other gases like hydrogen sulphide and nitrogen are present in a small amount.
So, the correct answer is '50 - 70%'.

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

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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

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  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'.