NCERT Solutions For Class 8 Science Chapter 5-Coal and Petroleum Solutions Pdf Download
NCERT Solutions For Class 8 Science Chapter 5 Coal and Petroleum Solutions deals with natural resources, Classification of Natural Resources. These Class 8 Science Ch 5 solutions will help you in scoring good marks as they cover important concepts in different patterns like MCQs and short answer questions, worksheets and more. NCERT Solutions For Class 8th Science Ch 5 helps students in many ways. Class 8 Science Chapter 5 Question and Answer are designed by our subject expert team.
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NCERT Solutions Class 8 Science Chapter 5 Overview
Coal and Petroleum Class 8 Solutions cover the topics of Coal, Coal gas, coal tar, coke, Fossil fuels, natural gas and petroleum for a detailed study you can check the Class 8 science chapter 5 Notes.
NCERT class 8 science chapter 5 questions and answers
Q 1. What are the advantages of using CNG and LPG as fuels?
Answer:
The advantages of using CNG and LPG as fuels are as follows
- CNG and LPG burn easily.
- CNG is used for power generation.
- CNG and LPG give a lot of heat energy when burnt.
- CNG and LPG can be transported easily through pipelines.
- CNG is used as a fuel for transport vehicles because it is less polluting. It is a cleaner fuel.
- CNG is used directly for burning in homes and factories where it can be supplied through pipes.
Q 2. Name the petroleum product used for surfacing roads.
Answer:
Bitumen is a petroleum product which is used for the surfacing of roads.
Q 3. Describe how coal is formed from dead vegetation. What is this process called?
Answer:
Millions of years ago, forests got buried under the soil due to natural disasters like earthquakes. Due to the deposition of soil over the forest, they got compressed at very high temperatures and high pressure. They slowly got converted into coal under these extreme conditions. The whole process of the formation of coal from dead vegetation is known as carbonization.
Carbonization:- The slow process of conversion of dead vegetation into coal is called carbonisation.
Q 4. Fill in the blanks.
(a) Fossil fuels are ____________, ____________, and ____________ .
(b) Process of separation of different constituents from petroleum is called _____________.
(c) Least polluting fuel for a vehicle is ______________.
Answer:
(a) Fossil fuels Coal, Petroleum, and natural gas.
(b) Process of separation of different constituents from petroleum is called refining.
(c) Least polluting fuel for a vehicle is Compressed Natural Gas (CNG).
Q 5. Tick True/False against the following statements.
(a) Fossil fuels can be made in the laboratory. (T/F)
(b) CNG is more polluting fuel than petrol. (T/F)
(c) Coke is the almost pure form of carbon. (T/F)
(d) Coal tar is a mixture of various substances. (T/F)
(e) Kerosene is not a fossil fuel. (T/F)
Answer:
a) False
b) False
c) True
d) True
e) False
Q 6. Explain why fossil fuels are exhaustible natural resources.
Answer:
fossil fuels required millions of years to form. fossil fuels formed from Dead vegetation and animals buried deep inside the earth under high temperatures and pressure. due to certain conditions, they cannot form in the laboratory and fossils are limited. The use of fossil fuels at a rapid rate by human activities so fossil fuels are exhaustible natural resources.
Exhaustible Natural Resources:- The amount of these resources in nature is limited. They can be exhausted by human activities. Examples of these resources are forests, wildlife, minerals, coal, petroleum, natural gas etc.
Q 7. Describe the characteristics and uses of coke.
Answer:
Characteristics:
- Coke is a tough, porous and black substance.
- Coke is an almost pure and amorphous form of carbon.
- Coke is harder and denser than charcoal.
- Coke is obtained by heating soft coal in the absence or little supply of air.
- Coke is used in the manufacture of steel and in the extraction of many metals.
Uses:
Coke is used in the manufacture of steel and in the extraction of many metals (as a reducing agent).
Q 8. Explain the process of the formation of petroleum.
Answer:
Petroleum was formed from organisms living in the sea. As these organisms died, their bodies settled at the bottom of the sea and got covered with layers of sand and clay. Over millions of years, the absence of air, high temperature and high pressure transformed the dead organisms into petroleum and natural gas.
Q 9. 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. | Year | Shortage (%) |
| 1. | 1991 | 7.9 |
| 2. | 1992 | 7.8 |
| 3. | 1993 | 8.3 |
| 4. | 1994 | 7.4 |
| 5. | 1995 | 7.1 |
| 6. | 1996 | 9.2 |
| 7. | 1997 | 11.5 |
Answer:- Total power shortage in India from 1993–1999 is given in the below graph.
Class 8 Science Chapter 5 Key Words Solutions
NCERT Solutions For Class 8 Science Chapter 5 Key Words Definition
Coal: Coal is a fossil fuel, formed by the decay of vegetation which existed millions of years ago.
Coal Gas: Coal gas is obtained as a by-product during the processing of coal to form coke, and is used as a fuel.
Coal Tar: It is a black thick liquid with an unpleasant smell obtained by the processing of coal.
Coke: It is a tough, porous and black substance obtained by the processing of coal.
Fossil Fuel: Dead remains of living organisms buried over millions of years, like coal, petroleum and natural gas are fossil fuels.
Natural Gas: Natural Gas is a very important fossil fuel. It is a cleaner fuel.
Petroleum: It is a dark oily liquid with an unpleasant odour. It is a source of petrol and diesel.
Petroleum Refinery: Petroleum refinery is a place where the process of separating the various constituents of petroleum is carried out.
Class 8 Science Chapter 5 Extra Question
NCERT Solutions For Class 8 Science Chapter 5 Extra Question
Class 8 Science Chapter 5 MCQ
NCERT Solutions For Class 8 Science Chapter 5 MCQ
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