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Science Class 8-Chapter 5-Coal and Petroleum- NCERT Exercise Solution (Question-Answer)

Science Class 8-Chapter 5-Coal and Petroleum- NCERT Exercise Solution ( Question-Answer) is provided below.

Exercise with Answer –

Q.1 What are the advantages of using CNG and LPG as fuels?

Answer – Advantage of using CNG and LPG as fuels are-

– They do not cause pollution.

– After burning they don’t leave ash.

They do not produce harmful gas, they burn with a smokeless flame.

Q2. Name the petroleum product used for surfacing of roads.

Anwer – Bitumen is a petroleum product used for surfacing of roads.

3. Describe how coal is formed from dead vegetation. What is the process called?

Answer- Millions of years ago dense forest got buried under the soil, rock due to natural processes like flooding, earthquake, etc.

4. Fill in the blanks.✍️

(a) Fossil fuels are ____________, ________ and _____________.

Answer -natural gas, coal and petroleum.

(b) Process of separation of different constituents from petroleum is called __________.

Answer – refining

(c) Least polluting fuel for vehicle is ______________.

Answer– CNG

Q5. Tick True/ False against the following statements.

(a) Fossil fuels can be made in the laboratory. (T/F)                      F

(b) CNG is more polluting fuel than petrol.  (T/F)                         F

(c) Coke is the almost pure form of carbon.  (T/F)                        T ✔️

(d) Coal tar is a mixture of various substances.  (T/F)                  T ✔️

(e) Kerosene is not a fossil fuel.  (T/F)                                               F

Q6. Explain why fossil fuels are exhaustible natural resources.

Answer – Fossil fuels are exhaustible natural resources because they are limited in nature and cannot be provided in the laboratory.

It takes millions of years to be formed.

Q7. Describe the characteristics and uses of coke.

Answer – Characteristic of coke-

It is a pure form of carbon(98%)

It is tough and porous.

It produces very little smoke.

Uses of coke-

It is used in the manufacture of steel and in the extraction of many metals.

It is used for producing water gas.

8. Explain the process of the formation of petroleum.

Answer – Petroleum is formed by dead aquatic animals and plants that get buried in sea millions of years ago. They got covered by a layer of sand and clay. Due to lack of air, high temperature and high pressure these dead organisms convert into petroleum and natural gas.

Q9. The following table shows the total power shortage in India from 1991-1997. Show the data in the form of a graph. Plot shortage percentage for the years on the Y-axis and the year on the X-axis.

S. No.YearShortage(%)
1

 

2

3

4

5

6

7

 1991

 

1992

1993

1994

1995

1996

1997

  7.9

 

7.8

8.3

7.4

7.1

9.2

11.5

Answer –

Finally, Science Class 8-Chapter 5-Coal and Petroleum- NCERT Exercise Solution ( Question-Answer) ended 🤞🤞🤞🤞

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