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Term 1 — Chapter 4

Energy and Power Resources

Class 7 - Around the World Geography Solutions


Get Set

Question 1

Identify the energy resources that these symbols represent. Choose from the box.

solar power, wind power, geothermal power, hydropower

1.

Identify the energy resource that this symbol represents. Energy and Power Resources, Around the World Geography Solutions ICSE Class 7.

2.

Identify the energy resource that this symbol represents. Energy and Power Resources, Around the World Geography Solutions ICSE Class 7.

3.

Identify the energy resource that this symbol represents. Energy and Power Resources, Around the World Geography Solutions ICSE Class 7.

4.

Identify the energy resource that this symbol represents. Energy and Power Resources, Around the World Geography Solutions ICSE Class 7.

Answer

  1. hydropower
  2. geothermal power
  3. solar power
  4. wind power

Quick Quiz

Question 1

Name two types of energy and power resources.

Answer

Two types of energy and power resources are:

  1. Renewable
  2. Non-Renewable

Question 2

Non-renewable resources are also called (inexhaustible/exhaustible) resources.

Answer

Non-renewable resources are also called exhaustible resources.

Question 3

The photovoltaic cells can directly convert solar energy into electricity. True or false?

Answer

True

Question 4

What is a wind farm?

Answer

An area with a large number of windmills is called a wind farm.

Question 5

The ............... hydroelectric project is built on the Mahanadi river.

Answer

The Hirakud hydroelectric project is built on the Mahanadi river.

Write one-word answer

Question 1

This solar-thermal appliance is used to cook food.

Answer

Solar cooker

Question 2

These devices are installed in areas with high wind velocity.

Answer

Windmills

Question 3

Hydroelectricity is an example of this energy resource.

Answer

Renewable

Question 4

This variety of coal has about 90 per cent carbon content.

Answer

Anthracite

Question 5

Petroleum occurs in this type of rock.

Answer

Sedimentary rocks

Correct the underlined word

Question 1

The underlined word in each sentence is incorrect. Write the correct word.

  1. Biogas is an example of non-renewable energy resource.
  2. A solar panel is made of phosphorus.
  3. The Bhakra hydroelectric project is built on the Kaveri river.
  4. Geothermal electricity is generated from coal.
  5. Coal is found around the Persian Gulf.

Answer

  1. Biogas is an example of renewable energy resource.
  2. A solar panel is made of silicon.
  3. The Bhakra hydroelectric project is built on the Satluj river.
  4. Thermal electricity is generated from coal.
  5. Petroleum is found around the Persian Gulf.

Match the following

Question 1

Sl.
No.
Column AColumn B
1.insolationKerala
2.nuclear energysolar energy
3.Mullaperiyar hydroelectric projectpetroleum
4.Dhanbadnon-renewable energy resource
5.black goldcoal-mining area

Answer

Sl.
No.
Column AColumn B
1.insolationsolar energy
2.nuclear energynon-renewable energy resource
3.Mullaperiyar hydroelectric projectKerala
4.Dhanbadcoal-mining area
5.black goldpetroleum

Give reasons for the following

Question 1

Renewable energy is called the 'energy of the future'.

Answer

Due to increase in the demand for energy and fast depletion of non-renewable energy resources, the renewable energy resources are gaining importance. This energy is abundant, renewable, pollution free and eco-friendly. It can be more easily supplied to rural, urban and remote areas. Thus, it is called the 'energy of the future'.

Question 2

Petroleum is called black gold.

Answer

Petroleum has great importance in the economy. A variety of products like petrol, diesel, kerosene, wax, plastics and lubricants are obtained by refining crude mineral oil. Other byproducts include raw materials for chemical fertilizers, synthetic fibres and drugs. Thus, it is called black gold.

Answer these questions

Question 1

Distinguish between renewable and non-renewable resources.

Answer

Sl.
No.
Renewable ResourcesNon-renewable Resources
1.Renewable resources are those which have unlimited reserves, unlikely to get exhausted by human activities and can be renewed by natural process or by human efforts.Non-renewable resources are those which are found in limited quantities and are likely to get exhausted by human activities.
2.Some examples are solar power, hydropower, wind power, tidal power, geothermal power, biogas.Some examples are coal, petroleum, natural gas, nuclear energy.

Question 2

How is electricity generated in a solar power plant?

Answer

Large concave reflectors are used in solar power plants which capture a large quantity of scattered sunlight and concentrate them at a point which can attain a very high temperature. This intense heat produces steam which drives a generator to produce electricity.

Question 3

Mention two advantages of hydropower. Name the state in which the Koyna hydroelectric project is built.

Answer

Two advantages of hydropower are:

  1. It is a cheap and renewable source of energy.
  2. It does not cause environmental pollution.

The Koyna hydroelectric project is built in the state of Maharashtra.

Question 4

Which is the largest coal-producing country in the world? Mention two ways in which coal can be conserved.

Answer

China is the largest coal-producing country in the world.

Two ways in which coal can be conserved are:

  1. Use of coking coal should be restricted to metallurgical industries.
  2. Selective mining for good quality coal should be stopped.

Question 5

Write the names of two countries which drill oil from the North sea. Mention two limitations of petroleum.

Answer

United Kingdom and Germany are the two countries which drill oil from the North sea.

Two limitations of petroleum are:

  1. It is a non-renewable resource and can be exhausted due to increasing use.
  2. Burning of petroleum leads to carbon emission. Thus, it is a major source of air pollution.
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