Short Questions Science CBSE 10

9/24/2015 CBSE

Short Questions Science CBSE 10

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

(c) They are less polluting than other fossil fuels

Question: 2. Name the petroleum product used for surfacing of roads.

Answer: Bitumen

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

Answer: Refining

(c) Least polluting fuel for vehicle is ������

Answer: CNG

Question: 5. Tick True/False against the following statements :

(a) Fossil fuels can be made in the laboratory.

(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.

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: 7. Describe characteristics and uses of coke.

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: 8. Explain the process of formation of petroleum.

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.

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