Question

2. (a) What are the qualities of an ideal source of energy?
(b) What are fossil fuels? What are the disadvantages of fossil fuels?

Answer 1

A)
1. cheap in cost
2. Easily available
3. produces less or no smoke
4. have high colorific value
5. easy to carry and store

B)
Fossil fuels release carbon dioxide when they burn, which adds to the greenhouse effect and increases global warming. Of the three fossil fuels, for a given amount of energy released, coal produces the most carbon dioxide and natural gas produces the least.


And its advantages are :
1. Fossil fuels are a finite resource. 
2. Fossil fuels are often cheap because of subsidies. 
3. Fossil fuels combust to create an acidic environment. 
4. Fossil fuels can damage the environment through human error. 
5. Fossil fuels aren’t a technology. 

Answer 2

a)A good source of energy should have the following qualities:

(a) It should be easily available.

(b) It should have high calorific value.

(c) It should be easy to store and transport

(d) It should be economical

(e) It should not cause environmental pollution.

b) A natural fuel formed deep under the earth from the prehistoric remains of plants and animals is called fossil fuel.

There are following disadvantage of fossil fuels:

(a) Burning of fossil fuels causes’ pollution.

(b) Oxides of Sulpher and nitrogen produced on burning of fossil fuel causes acid rain.

(c) Carbon dioxide causes greenhouse effect.

(d) Fossil fuels are non-renewable sources of energy.