Tag: commercial applications

Questions Related to commercial applications

Which among the following is known as land of windmills?

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

  1. Netherlands

  2. Cathopia

  3. Japan

  4. USA

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Correct Option: A
Explanation:
A- Netherland has numerous windmills as it utilizes windmill not only for energy conservation but also to beautify the landscape. Windmills are further used to pump out water from lowlands and drain them back into the rivers enabling the farming of the land. 
So, the correct answer is 'Netherlands'

Wind energy is an _____ energy resource

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

  1. Inexhaustible

  2. Exhaustible

  3. Both A and B

  4. None of the above

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Correct Option: A
Explanation:

Wind energy is an inexhaustible energy resource which has been used for centuries to ran wind mills and pump water.

Geothermal energy is used to obtain electricity in

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

  1. Tamil Nadu

  2. Bihar

  3. Himachal Pradesh

  4. Rajasthan

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Correct Option: C
Explanation:

In some places, the hot water comes to the earth surface as hot spring which can be used to generate electricity. In Himachal Pradesh, electricity is generated by this method.

Which technology is used to harvest solar energy from the sun?

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  1. Artificial photosynthesis

  2. Photovoltaics

  3. Solar heating

  4. All of the above

Show answer
Correct Option: D

Biogas can be a good substitute for

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  1. Fuel gas

  2. Petroleum and oil

  3. Coal

  4. Charcoal

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Correct Option: A
Explanation:
Biogas is produced by the decomposition of organic material from plants and animals. It consists of mainly methane gas which can be used as fuel. Old feeds of organic matter of biogas process can be dried and used as soil manure or fertilizers. Thus the correct answer is A.

Which of the following yields more energy?

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

  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

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Correct Option: B

Biogas plant is more useful than burning of dung cakes because

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  1. It is non-pollutant.

  2. It yields manure as well as fuel gas.

  3. It yields important biochemicals.

  4. Both A and B.

Show answer
Correct Option: D
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'.

Types of bioenergy are

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  1. Biomass

  2. Biofuel

  3. Biogas

  4. All of the above

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Correct Option: D
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'.

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

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

  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%'.