Read the given passage and fill in the blanks by selecting an appropriate option.
The process of conversion of wood into coal is called i There are three main varieties of coal that vary in their carbon content. $ii$ has up to $96$ per cent of carbon, $iii$ has about $65$ per cent carbon while iv has about $38$ per cent carbon.

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Important Questions on Coal and Petroleum

MEDIUM

8th Foundation

IMPORTANT

NSO Science Olympiad Workbook Grade 8>Chapter 5 - Coal and Petroleum>EXERCISES>Q 7

In the fractionating column, various fractions are obtained at various heights of the column. As the vapours reach a height where the temperature is equal to or just below the boiling point of that fraction, it will _____.

MEDIUM

8th Foundation

IMPORTANT

NSO Science Olympiad Workbook Grade 8>Chapter 5 - Coal and Petroleum>EXERCISES>Q 8

Select the incorrect statements among the following:
(i) Bitumen is used for metalling the roads.
(ii) Some inexhaustible natural resources like coal, petroleum and natural gas formed from the dead remains of living organisms are known as fossil fuels.
(iii) Many useful substances are obtained from coal (commercial importance), so it is also called 'Black gold'.
(iv) Natural gas is used as a starting material for the manufacture of a number of chemicals and fertilisers.

MEDIUM

8th Foundation

IMPORTANT

NSO Science Olympiad Workbook Grade 8>Chapter 5 - Coal and Petroleum>EXERCISES>Q 9

Which of the following represents the correct decreasing order of boiling points of the given liquids.

MEDIUM

8th Foundation

IMPORTANT

NSO Science Olympiad Workbook Grade 8>Chapter 5 - Coal and Petroleum>EXERCISES>Q 10

Different components of petroleum are separated by fractional distillation. What is the correct sequence of fractions obtained in the fractionating column from top to bottom?

MEDIUM

8th Foundation

IMPORTANT

NSO Science Olympiad Workbook Grade 8>Chapter 5 - Coal and Petroleum>EXERCISES>Q 11

Coal tar can be used as a starting material for manufacturing:
(i) Drugs
(ii) Photographic materials
(iii) Cookwares
(iv) Explosives

HARD

8th Foundation

IMPORTANT

NSO Science Olympiad Workbook Grade 8>Chapter 5 - Coal and Petroleum>EXERCISES>Q 12

Read the following statements carefully.
X : It is a fossil fuel used in thermal power plants to produce electricity.
Y : It is a porous, black and almost pure form of carbon.
Z: It is a mixture of about