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

What is a wind farm?

Write one-word answer:

1. This solar-thermal appliance is used to cook food.
2. These devices are installed in areas with high wind velocity.
3. Hydroelectricity is an example of this energy resource.
4. This variety of coal has about 90 per cent carbon content.
5. Petroleum occurs in this type of rock.

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.