NCERT Solutions Class 8 Science Chapter 5 Coal And Petroleum
NCERT Solutions Class 8 Science Chapter 5 Coal And Petroleum: National Council of Educational Research and Training Class 8 Science Chapter 5 Solutions – Coal And Petroleum. NCERT Solutions Class 8 Science Chapter 5 PDF Download.
NCERT Solutions Class 8 Science Chapter 5: Overview
Board |
NCERT |
Class |
8 |
Subject |
Science |
Chapter |
5 |
Chapter Name |
Coal And Petroleum |
Topic |
Exercise Solutions |
NCERT Solutions Class 8 Science Chapter 5 – Coal And Petroleum
CHAPTER: – 5
(COAL AND PETROLEUM)
Exercise: –
1)What are the advantages of using CNG and LPG as fuels?
Ans: – The advantage of using CNG and LPG is
- Easily available.
- Low cost.
- Used directly in burning.
2) Name the petroleum product used for surfacing of roads.
Ans: – Bitumen is used in road surfacing. After mixing with the other substance, it then rolled for the definite shape of the road.
3)Describe how coal is formed from dead vegetation. What is this process called?
Ans:- The vegetation which was present probably about 300million year ago deposited in the soil after the various natural calamities like earthquake or volcanic eruption and then this transfer to the coal throughout the years. This whole process is known as carbonization.
4)Fill in the blanks.
(a) Fossil fuels are _natural gas_____ , ____petroleum___ and_coal______ .
Explanations- (These all are extracted from the underground of earth)
(b) Process of separation of different constituents from petroleum is called__refining___
Explanations- (For getting the purest form)
(c) Least polluting fuel for vehicle is __CNG______.
Explanations- (As after there reaction toxicity of air doesn’t increase)
5)Tick True/False against the following statements.
(a) Fossil fuels can be made in the laboratory. (T/F)
Ans: -False.
Explanations- (As this are only extracted from the dumping of substance year after year)
(b) CNG is more polluting fuel than petrol. (T/F)
Ans: – False.
Explanations- (Petrol uses create hazarders gas in air.)
(c) Coke is almost pure form of carbon. (T/F)
Ans: – True.
Explanations- (100% carbon is present only in coke)
(d) Coal tar is a mixture of various substances. (T/F)
Ans: – True.
Explanations- (Dumping of different substance year after year)
(e) Kerosene is not a fossil fuel. (T/F).
Ans: – False.
Explanations- (It’s collected from petroleum product)
6) Explain why fossil fuels are exhaustible natural resources.
Ans: – The fuel which we mostly use in the vehicle or electricity production is store in limited number in the nature. So, if we use this without thinking about our future uses then it will be exhausted in future years.
7) Describe characteristics and uses of coke.
Ans: – It is a pure substance which extracted from the coal by heating. Generally, it is a black substance and porous which helps in manufacturer of steel. This coke also used in various metal extraction.
8) Explain the process of formation of petroleum.
Ans: – About million of years ago the vegetation of the earth decompose and store in a deeper in the soil by the different volcanic eruption and earthquake. This decomposes throughout the years because of carbonization become petroleum and natural gas.
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.
Ans: –