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

Which of the following yields more energy?

  1. Direct burning of cow dung

  2. Burning of biogas derived from cow dung

  3. Burning of manure derived from cow dung

  4. Burning of semi-decayed cow dung
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Biogas production through anaerobic digestion of cow dung is more energy-efficient and provides a cleaner fuel than direct burning, which is inefficient and releases pollutants.

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

Biogas plant is more useful than burning of dung cakes because

  1. It is non-pollutant.

  2. It yields manure as well as fuel gas.

  3. It yields important biochemicals.

  4. Both A and B.
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation
Biogas plant produces both biogas and manure from the decomposition of waste material or organic matter. Biogas has a high calorific value than cow dung cakes. Calorific value of methane is about 5.5 KJ/g while for cow dung cakes is about 3.1 KJ/g. Moreover, biogas does not produce any pollutant like cow dung cakes produce carbon dioxide on burning. Neither biogas leaves any ash or soot after burning. Hence, biogas is a non pollutant.
So, the correct answer is 'Both A and B'.
Multiple choice commercial applications management of natural resources unequal distribution of resources protecting our environment rules are for everyone

Types of bioenergy are

  1. Biomass

  2. Biofuel

  3. Biogas

  4. All of the above
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

  • Biomass is the amount of organic matter present in an organism at a given time. It is the stored form of energy in an organism.
  • Biofuel is any substance which has a biological origin and can be used as a fuel. For example, fuel wood.
  • Biogas is formed from the decomposition of organic matter and can be used as an alternative source of energy in place of fossil fuels.
The energy produced from all these sources is called bioenergy which is renewable and has no negative impact on environment.
So, the correct answer is 'All of the above'.

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

Biogas contains

  1. $50-70\%$ methane
  2. $30-40\%$ methane

  3. Traces of methane
  4. $80-95\%$ ethane
Reveal answer Fill a bubble to check yourself
A Correct answer
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%'.
Multiple choice commercial applications management of natural resources unequal distribution of resources protecting our environment rules are for everyone

Biogas mainly consists of

  1. Ethane
  2. $CO _2$
  3. $H _2$

  4. Methane
Reveal answer Fill a bubble to check yourself
D Correct answer
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'.
Multiple choice commercial applications management of natural resources unequal distribution of resources protecting our environment rules are for everyone

The land of wind mills is

  1. U.K.

  2. U.S.A.

  3. Netherland

  4. Himachal Pradesh
Reveal answer Fill a bubble to check yourself
C Correct answer
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'.