Question: 1. What are the advantages of using CNG and LPG as fuels?
Answer: Following are the advantages of using CNG and LPG as fuels:
(a) They are more efficient
(b) They can be easily transported; either in cylinders or through pipelines
Question: 2. Name the petroleum product used for surfacing of roads.
(c) They are less polluting than other fossil fuels
3. Describe how coal is formed from dead vegetation. What is this process
Answer: - Dead remains of plants got buried under the earth millions of
years ago. Due to intense heat and pressure inside the earth they got
converted into coal. The process of conversion of dead remains of plants
into coal is called carbonization.
Question: 4. Fill in the blanks :
(a) Fossil fuels are____________ and ________________
Answer: - Coal, Petroleum and Natural gas
(b) Process of separation of different constituents from petroleum is called� ________________.
(c) Least polluting fuel for vehicle is� ________________
Question: 5. Tick True/False against the following statements :
(a) Fossil fuels can be made in the laboratory.(F)
(b) CNG is more polluting fuel than petrol. (F)
(c) Coke is almost pure form of carbon. (T)
(d) Coal tar is a mixture of various substances.
(e) Kerosene is not a fossil fuel. (F)Question: 6. Explain why fossil fuels are exhaustible natural resources.
Question: 7. Describe characteristics and uses of coke.
Answer: It takes millions of years for the formation of fossil fuels. The
rate at which we are using them is very fast compared to the rate of their
formation. Due to this, fossil fuels are exhaustible in nature.
Question: 8. Explain the process of formation of petroleum.
Answer: Coke is a type of coal. It is a tough, porous and black substance.
It is almost pure form of carbon. Coke burns much cleaner than coal and
provides more energy for comparable mass. It is used in manufacture of steel
and in extraction of many minerals.
Question: 9. The following Table shows the total power shortage in India from
Answer: The organisms which lived in the sea got buried at the bottom of
oceans. Over a period of time, their dead bodies were covered with
sediments. Intense pressure and heat under the earth���s layers transformed
these organisms into petroleum.
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.