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17 questions · self-marked practice — reveal the answer and mark yourself.

Question 11 Mark
Why do we need to use environment friendly energy resources?
Answer
  • There are many energy resources which are environment-friendly, which are renewable and which aid in harnessing natural processes.
  • When we use environment-friendly energy sources such as solar energy, wind energy, energy from waste, etc.
  • We are contributing towards environment conservation, preservation and protection.
  • This will help in reducing the deterioration of environment due to use of non-eco friendly energy resources apart from reducing problems arising from pollution caused due to burning of fossil fuels and biomass energy, climate change, etc.
  • Environment-friendly resources will not only lead to sustainable development but also provide energy security which is the need of the hour.
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Question 21 Mark
Why are energy resources needed?
Answer
  • The demand for energy resources is increasing due to growing population, urbanisation and growing needs of man.
  • Energy resources are needed to prepare food, generate electricity, to propel vehicles and for other domestic and industrial needs.
  • We engage in various activities to fulfill our needs, for which we need energy from natural resources.
  • Our life will come to a standstill without resources like petrol, wind, natural gas, sunlight, besides other resources.
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Question 31 Mark
Which energy resources does man use the most? Why?
Answer
(i) The energy resource we use the most is oil as it has a wide array of uses. It is used as fuel which includes petrol, diesel, kerosene, jet fuel, LPG gas, etc.

(ii) It is also used in cosmetics, medicines, paints, lubricants, etc.

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Question 41 Mark
Which are the movements of ocean water that go on continuously?
Answer
Sea waves and tides are the movements of ocean water that go on continuously
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Question 51 Mark
What does generation of solar power depend on?
Answer
The generation of solar power depends on the intensity of sunrays and the duration of sunshine.
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Question 61 Mark
How is wind energy used to generate electricity?
Answer
Due to speed of the wind, the windmills turn, generating kinetic energy which in turn is further converted into electricity.
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Question 71 Mark
Which is the major problem faced by major metropolitan cities?
Answer
Waste disposal is the major problem faced by major metropolitan cities.
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Question 81 Mark
Why have some farmers raised biogas plants in their own yards?
Answer
Some farmers have raised biogas plants in their own yards to cater to their domestic needs.
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Question 91 Mark
Which are the biotic waste materials from which biogas is generated?
Answer
Biogas is generated from biotic waste material such as faeces of animals, dead leaves, shells, etc.
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Question 101 Mark
Apart from mineral oil what else is found in mineral oil wells?
Answer
In most of the mineral oil wells, apart from minerals, natural gas is also found.
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Question 111 Mark
How was coal formed?
Answer
Long ago, plant and animal remains got buried due to earth movements and they were then decomposed due to pressure and heat, leaving behind the element carbon and this is how coal was formed.
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Question 131 Mark
Write any one difference between: Substance-based energy resources and process based energy resources.
Answer
Generation of substance-based energy resources leads to pollution while that of process based energy resource is pollution free.
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Question 141 Mark
How are energy resources classified?
Answer
Energy resources can be classified in many ways such as conventional – non-conventional, biotic – abiotic, renewable – non-renewable, substance-based – process-based, etc.
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Question 151 Mark
How must we use energy resources?
Answer
  • Energy resources must be used very carefully.
  • The demand for energy is increasing all the time due to growing population, urbanisation and growing needs of man. ,
  • It is necessary to use alternative and non- conventional energy resources to meet these needs.
  • It is also necessary to use energy frugally.
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Question 161 Mark
Explain the term atomic energy.
Answer
  • Splitting of the atoms of minerals like uranium and thorium can be used for power generation.
  • In this process, using very small quantities of minerals, energy can be generated on a very large scale.
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Question 171 Mark
Energy from waste material can help solve the problem of waste disposal in cities. Explain.
Answer
  • Waste is generated daily on a very large scale in a big metropolitan cities.
  • Waste disposal is a major problem in such places.
  • This waste can be segregated to use the biotic component to generate gas which can be used to generate power.
  • In the future, this may help to solve the problem of waste disposal in cities
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