Question

The downside with fossil fuels is that they are limited and cannot be formed within a

human’s lifetime. Moreover, we are not completely aware of the level of heat and pressure they

were exposed to. The first commercial oil well came into existence only in the eighteenth century. But since then, we humans have exploited the energy-rich fuels. It has turned the

fortunes of nations within a short span of time. Today eighty percent of our energy needs are met

by fossil fuels only. Though we continue to discover more resources, they are limited, and we

cannot be dependent on them forever. Another major drawback of fossil fuels is the release of

carbon dioxide upon their combustion. This carbon dioxide is the main contributing factor to

global warming. Therefore, we need to look for alternative sources of energy in order to combat

global warming and reduce our dependence on fossil fuels.



a. Give 2 examples of alternative sources of energy.

b. Define non-renewable sources of energy.

c. Name the gas evolved during:

i. complete combustion of fuel ii. incomplete combustion of fuel.

d. We should reduce the use of fossil fuels. Give reason.​

Answer 1

Answer:

1) Nuclear Power, Natural Gas 2)Non- renewable energy comes from sources that will run out or will not be replenished for thousands or even millions of years.3) 1. complete combustion takes place, when carbon dioxide is produced.

2. incomplete combustion takes place, when there is not enough oxygen

4) Fossil fuel energy affects the environment and health due to the emissions and impact of mining practices.

Explanation:

I hope it helps you

Answer 2

Answer:

a. Solar energy and wind energy are examples of alternative sources of energy.

b. Energy sources which cannot be replaced or replenished in a short amount of time are called non-renewable sources of energy.

c.

i. Carbon Dioxide (CO2) is evolved during complete combustion of fuel.

ii. Carbon Monoxide (CO) is evolved during incomplete combustion fuel.

d. Fossil fuels cause global warming as they release carbon dioxide on burning. They cause a lot of pollution and affect the environment and health of many people. Fossil fuel are also limited sources, hence their use should be reduced.