Grade : VIII
Geography Chapter: 6
Power Resources
Question And Answers
SHORT ANSWER QUESTIONS
SHORT ANSWER QUESTIONS
Que :
Answer :
- Conventional sources of energy are those which have been in use for a long time.
- A few examples of conventional sources of energy are firewood, coal, petroleum, natural gas and hydel power.
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Answer :
- Fossil fuels are formed from the remains of plants and animals that have remained buried under the earth for millions of years.
- These fossils get converted into fuel due to heat and pressure.
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Answer :
- A solar panel is a device that is used to convert solar energy into electrical energy.
- The solar panel is made up of a number of solar cells that absorb solar energy and convert it into electricity.
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Answer :
- Petroleum is often called black gold as it is scarce and very valuable.
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- The gravitational pull of the moon and the sun, and the rotation of the earth result in ocean tides.
LONG ANSWER QUESTIONS
LONG ANSWER QUESTIONS
Que :
Answer :
- The commonly used sources of energy in India are firewood, coal, petroleum, natural gas and hydroelectricity.
- These sources are called conventional sources of energy because they have been in use for a long time.
- In fact, firewood is a widely used source of energy in India, which is used as fuel for cooking food.
- As much as fifty per cent of the energy in villages comes from firewood.
- On the other hand, coal is used extensively to generate electricity.
- Petrol, diesel and CNG are fuels that are commonly used in automobiles.
Que : ?
Answer :
- People have been using hot springs and geysers for bathing, cooking and heating, for centuries.
- Today, geothermal energy is being used for broader applications, like generating electricity.
- Geothermal plants are inexpensive to set up and their scale of operation can be altered according to the size of projects.
- However, geothermal plants are generally located far away from cities and, hence, it can be expensive to transport energy through long distances.
Que : ?
Answer :
- Nuclear energy is a non-conventional source of energy.
- It is stored in the nuclei of radioactive elements like uranium and thorium.
- Nuclear energy is produced when the nucleus of an atom is split.
- This phenomenon is known as nuclear fission.
- During nuclear fission, a tremendous amount of heat and light energy is released.
- In a nuclear power plant, there are nuclear reactors in which nuclear fission takes place in a controlled manner.
- The heat generated during this fission is used to produce electricity.
- Although nuclear energy can be used to produce a large amount of energy, it’s not so easy to control nuclear reactions.
- A lot of radioactive waste is generated during nuclear fission, which can be very dangerous for the environment.
- Moreover, nuclear reactors are expensive to set up.