PHYSICS CLASS VIII COAL & PETROLEUM

COAL & PETROLEUM

1. Complete the given analogy.

(i) Coal : Exhaustible :: : Inexhaustible

(ii) Coaltar : _ :: Coke : Manufacture of steel

(iii) Petrochemical : Plastic :: CNG : _

(iv) Carbondioxide    : Global warming :: : Nausea

2. Match the following.

(i) Natural resource         [ ] a. Carbonisation

(ii) Coal                                 [ ] b. Plastic chair

(iii) Petrochemical product [ ] c. Krishna, Godavari delta

(iv) Natural Gas                 [ ] d. Plankton

(v) Petroleum                         [ ] e. Water

3.  Multiple choice questions. Choose the correct answer.

(i) Which one of the following is less polluting fuel ?	[	]
(A) Natural gas         (B) Coal         (C) Kerosene(D) Petrol
(ii)  The main constituent of coal is …………. (A)  Carbon                (B) Oxygen   (C) Air            (D) Water	[	]
(iii)  Which one of the following material is used for making shoe polish ? (A)  Paraffin wax       (B) Petrol       (C) Diesel      (D)  Lubricating oil	[	]

 

 

4.  Fill in the blanks.

(i)                                         was used in manufacture of steel.

(ii)  The byproduct of coal used in synthetic dyes and  paints  is                           

(iii)  Coal was formed in areas where large  amounts of               _ was buried under the earth.

(iv)  _                            gas which causes climate change and global warming.

 

 

5.  Name the petroleum products used for road surfacing.

A. (i) Coal tar is a black thick liquid.

(ii)  It is obtained from petroleum.

(iii)  It is a mixture about 200 substances.

        (iv)  Coal tar is the main product used for roads surfacing.

6.  Explain the process of formation of petroleum in Earth.

A. (i) The organisms named Plankton were found in the bottom of seas and oceans and rivers.

               (ii)  Plankton have tiny droplets of oil in their bodies.

(iii)  As these organisms died, their bodies settled at the bottom and covered with sand and clay.

(iv) Due to absence of air these are transformed as petroleum or natural gas by high pressure and high temperature.

7.  “Crude oil and refined fuel when spills into the sea from tanker of ships by accident.” Discuss the consequences of this on environment.

A. If “Crude oil and refined fuel when spills into the sea from tanker of ships by accident.”

Then (i) They cause damage to Natural eco system

(ii)  They causes for the death of sea birds

(iii)  They kill marine mammals and shell fish in the seas.

(iv)  They disturb the eco systems and damage mangrove forests.

(v)  They cause damage of breeding grounds of some organisms like Tortoise.

8. “The use of CNG and LPG as fuels for automobiles helps us to minimize air pollution and maintains ecological balance.” Do you agree with this statement ? If yes explain.

 A. (i) Yes. I agree with this statement.

            (ii)  Now we are using the fossil fuels for our energy needs.

(iii)  Fossil fuels like coal, Petroleum, CNG, LPG are non renewable energy resources.

(iv) The fuels obtained from Petroleum like Petrol, Diesel are used in vehicles and in automobiles. They cause air pollution. As they are liquid fuels, produce smoke and liberate different poisonous gases like sulphur dioxide.

(v)But CNG and LPG are different from these fuels. CNG and LPG are gaseous fuels. They do not produce smoke on burning. They liberate only Carbon dioxide and water vapour. They cause less air pollution.

(vi)So usage of CNG and LPG in automobiles is good to maintain ecological balance and to reduce air pollution.

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