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Solutions for Geography, Class 7, ICSE
Distinguish between renewable and non-renewable resources.
| Sl. No. | Renewable Resources | Non-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. |
How is electricity generated in a solar power plant?
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.
Mention two advantages of hydropower. Name the state in which the Koyna hydroelectric project is built.
Two advantages of hydropower are:
The Koyna hydroelectric project is built in the state of Maharashtra.
Which is the largest coal-producing country in the world? Mention two ways in which coal can be conserved.
China is the largest coal-producing country in the world.
Two ways in which coal can be conserved are:
Write the names of two countries which drill oil from the North sea. Mention two limitations of petroleum.
United Kingdom and Germany are the two countries which drill oil from the North sea.
Two limitations of petroleum are:
The underlined word in each sentence is incorrect. Write the correct word.
Identify the energy resources that these symbols represent. Choose from the box.
| solar power, wind power, geothermal power, hydropower |
|---|
1.
2.
3.
4.
Renewable energy is called the 'energy of the future'.
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'.
Petroleum is called black gold.
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.
| Sl. No. | Column A | Column B |
|---|---|---|
| 1. | insolation | Kerala |
| 2. | nuclear energy | solar energy |
| 3. | Mullaperiyar hydroelectric project | petroleum |
| 4. | Dhanbad | non-renewable energy resource |
| 5. | black gold | coal-mining area |
| Sl. No. | Column A | Column B |
|---|---|---|
| 1. | insolation | solar energy |
| 2. | nuclear energy | non-renewable energy resource |
| 3. | Mullaperiyar hydroelectric project | Kerala |
| 4. | Dhanbad | coal-mining area |
| 5. | black gold | petroleum |
Name two types of energy and power resources.
Two types of energy and power resources are:
Non-renewable resources are also called (inexhaustible/exhaustible) resources.
Non-renewable resources are also called exhaustible resources.
The photovoltaic cells can directly convert solar energy into electricity. True or false?
True
What is a wind farm?
An area with a large number of windmills is called a wind farm.
The ............... hydroelectric project is built on the Mahanadi river.
The Hirakud hydroelectric project is built on the Mahanadi river.
This solar-thermal appliance is used to cook food.
Solar cooker
These devices are installed in areas with high wind velocity.
Windmills
Hydroelectricity is an example of this energy resource.
Renewable
This variety of coal has about 90 per cent carbon content.
Anthracite
Petroleum occurs in this type of rock.
Sedimentary rocks