Coal and Petroleum - Class 8 - Science
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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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Sign up nowDescribe how coal is formed from dead vegetation. What is this process called?
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Sign up nowFill 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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Sign up nowTick 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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Sign up nowExplain why fossil fuels are exhaustible natural resources.
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Sign up nowDescribe characteristics and uses of coke
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Sign up nowExplain the process of formation of petroleum.
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Sign up nowThe 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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Sign up nowExtra 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.
Is a key ingredient in the fertilizer industry, and is imported to India.
A. Nitrogen
B. Phosphate
C. Potash
D. Hydrogen
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Sign up nowEthanol is a derivative of corn and other grains. When burned as fuel, it emits significantly lower levels of carbon monoxide, a major atmospheric pollutant, than gasoline. For that reason, environmentalists claim that ethanol is a better source of energy than gasoline. Which of the following, if true, most strongly supports the environmentalists' claim?
A. When burned as fuel, ethanol does not release any pollutants at higher levels than gasoline.
B. Ethanol is comparable in price to gasoline.
C. Available supplies of corn are sufficient to supply several years' worth of ethanol.
D. Most gasoline companies already possess the technology to produce ethanol.
E. Ethanol can be used as heating fuel.
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Sign up nowMahima was looking at one of the samples kept in the coal display. One of the samples intrigued her very much. It looked like "brownish-black organic material and almost looked like decayed wood." Could you help her identify the sample?
A) Lignite
B) Bituminous
C) Peat
D) Tar
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Sign up nowLong Questions - Coal and Petroleum | NCERT | Science | Class 8
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.
Describe the process of carbonisation and its role in the formation of coal. How has coal been used historically and in modern times?
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Sign up nowExplain how the use of fossil fuels contributes to global warming. What sustainable practices can we adopt to reduce our dependence on fossil fuels?
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Sign up nowShort Questions - Coal and Petroleum | NCERT | Science | Class 8
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.
What is the process of conversion of dead vegetation into coal called?
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Sign up nowHow is coal used in various industries?
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