8th Standard CBSE Science Unit 5 Coal and Petroleum Important Question Paper | QB365

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8th Standard CBSE Science Unit 5 Coal and Petroleum Important Question Paper

Published on: 31/07/2019

Coal and Petroleum

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Std: 8th Standard CBSE - Science

chapter: - Model Question paper

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Questions:

Generic 3

5 x 3 = 15

What is natural gas? What are the advantages of using CNG?

What is refining of petroleum? Give different constituents of petroleum.

List various constituents of petroleum and their uses.

Look at the figure where petroleum and natural gas deposits are shown. Why do we find oil layer above water layer?

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

True or False

5 x 1 = 5

Kerosene is not a fossil fuel.

(a)

True

(b)

False

Coal tar is a mixture of various substances.

(a)

True

(b)

False

Coke is almost pure form of carbon

(a)

True

(b)

False

CNG is more polluting fuel than petrol.

(a)

True

(b)

False

10.

Fossil fuels can be made in the laboratory.

(a)

True

(b)

False

Generic 2

4 x 2 = 8

11.

Which petroleum product is commonly used for electric generators?

12.

What do you mean by carbonisation?

13.

Coal, petroleum and natural gas are called fossil fuels. Why?

14.

Petrochemicals are obtained from where? Give examples

Generic 5

2 x 5 = 10

15.

What do you understand by the statement that "the known reserves of these will last only few hundred years"?

16.

The material X is a fossil fuel. It is formed from the buried large land plants (vegetation) by a very slow process Y. When X is heated in the absence of air, i. e. in the process called Z, it gives three products A, B and C. A is used as a reducing agent in the extraction of metals, B is used as an industrial fuel, whereas the product C has been traditionally used for metalling the roads. It is now replaced by a petroleum product, bitumen. Now give the answer of the following questions.
(a) What is the material X?
(b) What is the physical state and colour of X?
(c) Name the processes Y and Z.
(d) What are the products A, B and C?

Multiple Choice Question

5 x 1 = 5

17.

Coal-tar contains about _______ substances:

(a)

400

(b)

300

(c)

100

(d)

200

18.

It was used for street lighting for the first time in London.

(a)

Coke

(b)

Coal-tar

(c)

Coal gas

(d)

Petrol

19.

The World's first oil well was drilled in :

(a)

USSR

(b)

USA

(c)

India

(d)

20.

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

21.

Various materials which are obtained from nature are called natural resources. Which of the following is not a natural resource?

(a)

Minerals

(b)

Water

(c)

Soil

(d)

Plastic

Fill up / 1 Marks

5 x 1 = 5

22.

Coal and petroleum are formed from the dead remains of organisms and are known as_________.

23.

The slow process of conversion of dead vegetation into coal is called__________.

24.

The substances formed from natural gas and petroleum are called_____________

25.

Petroleum is very important so, it is called______________________

26.

Sunlight is an ______________natural resource.

Match the following

5 x 1 = 5

27.

Petrol and diesel

28.

LPG

29.

Good fuels

30.

Oil refinery

31.

Coal

1 Marks

5 x 1 = 5

32.

What are the uses of diesel?

33.

Where is oil found in India?

34.

When was coal gas first used for street lighting in London?

35.

Write one use of coal.

36.

Name some useful products obtained from coal when it is processed in industry.

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Answers Key:

Generic 3

5 x 3 = 15

Natural gas is a very important fossil fuel. It is stored under high pressure as compressed natural gas (CNG).
Advantage of CNG :
(i) It is easy to transport.
(ii) It does not produce any pollution.
(iii) No residue is left after burning of CNG.
(iv) It burns completely in the air.

Refining of Petroleum: Petroleum is a dark oily liquid. It has an unpleasant odour. It is a mixture of various constituents such as petroleum gas, petrol, diesel, lubricating oil, paraffin wax etc. The process of separating the various constituents of petroleum is known as refining. Different constituents of petroleum are LPG, petrol, kerosene, diesel, lubricating oil, paraffin wax, bitumen etc.

Various constituents of petroleum and their uses:
(i) LPG: Fuel for home and industry.
(ii) Petrol: Motor fuel, aviation fuel, solvent for dry cleaning.
(iii) Kerosene: Fuel for stoves, lamps and for jet aircraft.
(iv) Diesel: Fuel for heavy motor vehicles and electric generators.
(v) Lubricating Oil: Lubrication
(vi) Paraffin wax: Ointments, candles, Vaseline etc.
(vii) Bitumen: Paints and road surfacing.

Oil is lighter than water, hence floats over it.

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.

True or False

5 x 1 = 5

(b)
False

(a)
True

(a)
True

(b)
False

10.

(b)
False

Generic 2

4 x 2 = 8

11.

Diesel is used to run electric generators.

12.

The slow process of conversion of dead vegetation into coal is called carbonisation.

13.

Coal, petroleum and natural gas are called fossil fuels because they are formed by the decomposition of the remains of pre-historic plants and animals (fossils) buried under the earth long ago.

14.

Those chemicals which are obtained from petroleum and natural gas are called petrochemicals. Some examples of petrochemicals are methyl alcohol, ethyl alcohol, acetone, benzene, hydrogen, etc.

Generic 5

2 x 5 = 10

15.

The known reserves of these will last only a few hundred years is true, as we know that coal and petroleum are fossil fuels. It requires the dead organisms millions of years to get converted into these fuels. Excessive and injudicious use of these fuels leads to shortage of these fuels and their use is also linked to global warming. It is therefore necessary that we use these fuels only when absolutely necessary.

16.

(a) Coal.
(b) It is solid and black coloured.
(c) Y is carbonisation and Z is destructive distillation.
(d) A is coke, B is coal gas while C is coal tar.

Multiple Choice Question

5 x 1 = 5

17.