Identify the energy resources that these symbols represent. Choose from the box.
|solar power, wind power, geothermal power, hydropower|
- geothermal power
- solar power
- wind power
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?
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.
Write one-word answer
This solar-thermal appliance is used to cook food.
These devices are installed in areas with high wind velocity.
Hydroelectricity is an example of this energy resource.
This variety of coal has about 90 per cent carbon content.
Petroleum occurs in this type of rock.
Correct the underlined word
The underlined word in each sentence is incorrect. Write the correct word.
- Biogas is an example of non-renewable energy resource.
- A solar panel is made of phosphorus.
- The Bhakra hydroelectric project is built on the Kaveri river.
- Geothermal electricity is generated from coal.
- Coal is found around the Persian Gulf.
- Biogas is an example of renewable energy resource.
- A solar panel is made of silicon.
- The Bhakra hydroelectric project is built on the Satluj river.
- Thermal electricity is generated from coal.
- Petroleum is found around the Persian Gulf.
Match the following
|Column A||Column B|
|2.||nuclear energy||solar energy|
|3.||Mullaperiyar hydroelectric project||petroleum|
|4.||Dhanbad||non-renewable energy resource|
|5.||black gold||coal-mining area|
|Column A||Column B|
|2.||nuclear energy||non-renewable energy resource|
|3.||Mullaperiyar hydroelectric project||Kerala|
Give reasons for the following
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.
Answer these questions
Distinguish between renewable and non-renewable resources.
|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:
- It is a cheap and renewable source of energy.
- It does not cause environmental pollution.
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:
- Use of coking coal should be restricted to metallurgical industries.
- Selective mining for good quality coal should be stopped.
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:
- It is a non-renewable resource and can be exhausted due to increasing use.
- Burning of petroleum leads to carbon emission. Thus, it is a major source of air pollution.