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Coal And Petroleum - Important Questions Model Paper In 8th Science

Published on: 30/07/2018

Some of the important questions are prepared from this chapter Coal and Petroleum.
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chapter: - Model Question paper

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Questions:

Generic 3

5 x 3 = 15

Where do we get coal from and how is it formed?

You are provided with a mixture of petroleum and water. Can you suggest a method to separate the two?

What are the disadvantages of using fossil fuels?

Write the difference between coke and coal

What are the advantages of using CNG and LPG as fuels?

Fill up / 1 Marks

5 x 1 = 5

The substances formed from natural gas and petroleum are called_____________

_______________is used in vaseline

Coal tar is a black, thick_____________ with an _______________smell.

Coal is one of the _____________used to cook food

10.

Process of separation of different constituents from petroleum is called ____________________

True or False

5 x 1 = 5

11.

Coke is harder and denser than charcoal

(a)

False

(b)

True

12.

First oil well was drilled in USA.

(a)

False

(b)

True

13.

Under high temperature and pressure, dead plants get slowly converted to coal.

(a)

False

(b)

True

14.

Kerosene is not a fossil fuel.

(a)

True

(b)

False

15.

CNG is more polluting fuel than petrol.

(a)

True

(b)

False

Generic 2

5 x 2 = 10

16.

How CNG is a good fuel than petrol and diesel in vehicles?

17.

Which petroleum product is commonly used for electric generators?

18.

Petroleum is called black gold. Why?

19.

Why are gaseous fuels preferred to solid fuels in chemical industries?

20.

Which product of coal is used as a reducing agent in the extraction of metals?

Generic 5

2 x 5 = 10

21.

The substance A is a fossil fuel. It occurs deep below the earth's crust in certain areas. Another fossil fuel B is found above the substance A. When A is subjected to a process C, a number of different products (fractions) are collected at different temperature ranges which have different uses. A special grade of product D obtained in this process is used as aviation fuel in jet aeroplanes. The product D is also used in stoves, lamps, etc
Now give the answer of the following questions.
(a) What are the substances, A and B?
(b) Write the physical states of substances A and B.
(c) What is the process C called?
(d) Name the product D.

22.

Why petrol is exhaustible natural resource whereas sunlight is not? Explain.

Multiple Choice Question

5 x 1 = 5

23.

The product(s) obtained by destructive distillation of coal is/are

(a)

coal tar

(b)

coke

(c)

coal gas

(d)

All of these

24.

Which of the following is not a constituent of petroleum?

(a)

Paraffin wax

(b)

Lubricating oil

(c)

Petrol

(d)

Coke

25.

Which substance is formed by the carbonisation of dead vegetation?

(a)

Coal

(b)

Coke

(c)

Coal gas

(d)

Coal tar

26.

Exhaustible natural resources are

(a)

unlimited in quantity

(b)

not dependent on nature

(c)

limited in quantity

(d)

not exhausted by human activities

27.

Which of the following is a pair of exhaustible natural resources?

(a)

Coal and soil

(b)

Air and sunlight

(c)

Water and petroleum

(d)

Wildlife and minerals

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Answers Key:

Generic 3

5 x 3 = 15

About 300 million years ago, the earth had dense forests in low lying wetland areas. Due to natural processes like flooding, these forests got buried under the soil and deposited as fossil. Due to high temperature and pressure, dead plants got slowly converted into coal.

Decantation can be used to separate a mixture of petroleum and water. The mixture is allowed to stand. Carefully, lighter layer can be poured and separated without disturbing the heavier one.

Disadvantages of using fossil fuels are
(i) It causes air pollution.
(ii) It causes global warming because they produce greenhouse gas, i.e. carbon dioxide on burning
(iii) The by-products of burning fuels cause acid rain which pollute water resources

Difference between coke and coal are as follows:

Coke	Coal
It is almost pure form of carbon	It mainly contains mainly carbon.
It is an amorphous form of carbon	It is a non-crystalline form of carbon
It is obtained by heating coal in the absence of air.	It is obtained by the decay of vegetation which existed millions of year ago.

The advantages of using CNG and LPG as fuels are as follows :
(i) CNG and LPG are clean fuels.
(ii) They do not produce pollution.
(iii) They are easily available.
(iv) They can be used directly for burning.
(v) They are easy to transport.
(vi) Their cost is low.

Fill up / 1 Marks

5 x 1 = 5

()
petrochemicals

()
Paraffinwax

()
liquid, unpleasant

()
fuels

10.

()
refining

True or False

5 x 1 = 5

11.

(a)
False

12.

(a)
False

13.

(a)
False

14.

(b)
False

15.

(b)
False

Generic 2

5 x 2 = 10

16.

CNG is a good alternative to petrol and diesel in vehicles because it is a clean fuel and does not cause air pollution. It is filled in cylinders.

17.

Diesel is used to run electric generators.

18.

Petroleum is called black gold due to its great commercial importance.

19.

Gaseous fuels are preferred because they burn completely liberating large amount of heat leaving behind no ash.

20.

Coke

Generic 5

2 x 5 = 10

21.

(a) A is petroleum and B is natural gas.
(b) A is thick liquid while B is gas.
(c) C is called fractional distillation
(d) D is kerosene.

22.

The natural resources which are present in a limited quantity in nature and can be exhausted (used up) by human activities are called exhaustible natural resources, e.g. coal, petroleum, natural gas, minerals, forests, wildlife, etc.
It requires millions of years for the conversion of the dead organisms into petroleum, from which petrol is separated. So, once the present stock of it gets exhausted, no new supplies of it will be available to us in the near future, whereas sunlight is present in an unlimited quantity in nature, so it is inexhaustible natural resource. It is not likely to be exhausted by human activities.

Multiple Choice Question

5 x 1 = 5

23.