Coal and Petroleum - Class 8 Science - Chapter 3 - Notes, NCERT Solutions & Extra Questions
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Notes - Coal and Petroleum | Class 8 NCERT | Science
Comprehensive Class 8 Notes on Coal and Petroleum: Key Concepts Explained
Introduction to Natural Resources
Natural resources are materials that are obtained from nature and are utilised by humans for their basic needs. These resources can be broadly classified into two categories: inexhaustible and exhaustible.
Types of Natural Resources
Inexhaustible Natural Resources
Inexhaustible resources are available in unlimited quantities in nature and are not likely to be depleted by human activities. Examples include sunlight and air.
Exhaustible Natural Resources
Exhaustible resources are present in limited quantities and can be exhausted by human usage. Examples include...
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Notes - Flashcards - Coal and Petroleum | Class 8 NCERT | Science
Back Questions - Coal and Petroleum | NCERT | Science | Class 8
What are the advantages of using CNG and LPG as fuels?
Using CNG (Compressed Natural Gas) and LPG (Liquefied Petroleum Gas) as fuels provide several advantages:
Environmentally Friendly: Both CNG and LPG burn cleaner than other fossil fuels, producing fewer emissions and reducing environmental impact.
Cost-Effective: CNG and LPG are usually cheaper than petrol and diesel, making them a more economical option.
Efficient: These fuels are efficient and provide good mileage, making them a preferred choice for transportation.
Convenience: LPG can be used directly for heating and cooking in homes, making it a convenient fuel option. Similarly, CNG can be used directly for burning in homes and factories where it can be supplied through pipes.
Safety: CNG and LPG are safer than other fuels as they do not contaminate the environment in case of a spill, as they dissipate into the atmosphere.
Name the petroleum product used for surfacing of roads.
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Describe how coal is formed from dead vegetation. What is this process called?
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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 vehicle is _________________.
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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 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)
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Explain why fossil fuels are exhaustible natural resources.
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Describe characteristics and uses of coke
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Explain the process of formation of petroleum.
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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 |
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What are some examples of inexhaustible and exhaustible natural resources?
Some examples of inexhaustible natural resources are sunlight, air, and wind. These are available in unlimited quantities and can be used indefinitely without the fear of them being exhausted. Conversely, forests, wildlife, minerals, coal, petroleum, and natural gas are examples of exhaustible natural resources. They are finite and can be completely used up or exhausted by human activities if not managed sustainably.
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What measures should be taken to conserve our fossil fuel resources?
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Explain the difference between inexhaustible and exhaustible natural resources with examples. Describe the implications of overusing exhaustible resources.
The key difference between inexhaustible and exhaustible natural resources lies in their abundance and renewal rates. Inexhaustible natural resources, like sunlight and air, are unlimited and can't run out due to human activity. Conversely, exhaustible natural resources such as forests, wildlife, minerals, coal, and petroleum, exist in a limited quantity and can be depleted by overuse. Overusing exhaustible resources leads to scarcity and ecological imbalance. For example, burning fossil fuels contributes to air pollution and global warming. Once exhausted, these resources cannot be quickly replenished as their formation takes millions of years. Thus, sustainable usage of these resources is crucial for our environment and future generations.
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How is coal processed to provide useful products such as coke, coal tar, and coal gas? Discuss the uses of these derivatives.
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Ask Chatterbot AIExtra Questions - Coal and Petroleum | NCERT | Science | Class 8
Name a fossil fuel other than coal and petroleum.
Natural gas is an example of a fossil fuel other than coal and petroleum.
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Which of the following are made from paraffin?
A) Vaseline B) Paints C) Fertilizer D) Candles
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What makes the wheels of a steam engine move? Explain in detail. [3 MARKS]
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Which of the following commodities is imported by India on a large scale?
A Petroleum and its products
B Pearls
C Inorganic chemicals
D Coal
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