Free Coal and Petroleum 01 Practice Test - 8th Grade 

Question 1

Kerosene is not a fossil fuel.

A. True
B. False


Solution : B

Fossil fuels are formed when dead plants and animals undergo decomposition under high pressure and temperature for a long period of time. 

Petroleum is formed when dead sea organisms undergo decomposition at high temperature and pressure. Petrol, diesel and kerosene are products that are obtained by refining petroleum. Hence, kerosene is also a fossil fuel.

Question 2

Anthracite is the grade of coal that has the lowest carbon content.

A. True
B. False


Solution : B

Anthracite is the grade of coal that has the highest percentage of carbon followed by bituminous coal, lignite and peat. Higher the grade of a coal, lower is its ash content and thus greater combustibility.

Question 3

What are the constituents of the producer gas?

A. Carbon dioxide & oxygen
B. Carbon monoxide & oxygen
C. Carbon dioxide & nitrogen
D. Carbon monoxide & nitrogen


Solution : D

When air is passed over red hot coke, incomplete combustion takes place resulting in the formation of CO (carbon monoxide) and the mixture of carbon monoxide and nitrogen (a major component of air) is called producer gas.

Question 4

Which of the following variety of coal is a heterogeneous mixture of decomposed plant material that is accumulated in water and in the absence of air?

A. Anthracite
B. Lignite
C. Peat
D. Bituminuous


Solution : C

Coal is formed when organic material is buried under sediment and exposed to high temperature and pressure for millions of years. The formation of coal takes place in four stages: peat, lignite, bituminous and anthracite coal. Peat is a heterogeneous mixture of more or less decomposed plant material that is accumulated in water, in the absence of air (anaerobic conditions). Peat is the primitive form of coal. The carbon content is least in peat.

Question 5

Which of these is used to repel moths?


Naphthalene balls 




Coal gas


Paraffin wax


Solution : A

Naphthalene or mothball is a white solid with a pungent odour derived from the distillation of coal tar. It sublimes into a pungent toxic smell which drives away insects and moths. 

Question 6

Which of the following is used in metal extraction?

A. Coke
B. Coal tar
C. Coal gas
D. Petroleum


Solution : A

Coke is a pure form of carbon. It is used in the manufacture of steel and in extraction of various metals. It is used because it is cheap and readily available.

Question 7

Identify the products that are made from crude oil.

A. Petrol
B. Crayons
C. Coal
D. Tyres


Solution : A, B, and D

Petroleum products are materials derived from crude oil (petroleum). Refineries also produce other chemicals, some of which are used in chemical processes to produce plastics and many other useful materials including crayons, tyres, plastics, synthetic fibres, etc. 

Coal is another fossil fuel made up of dead and decaying plant matter.

Question 8

Identify the term that is used for the unprocessed oil that comes out of the ground. 

A. Petrol
B. Petroleum
C. Kerosene
D. Diesel


Solution : B

Petroleum or crude oil is a naturally occurring liquid found deep inside the Earth, which is commonly refined into various types of fuels. Components of petroleum are separated using a technique called fractional distillation. Petrol, diesel, kerosene are few of the many components of petroleum.

Question 9

The substances that are obtained from petroleum and natural gas are called ______.

A. petroproducts
B. petrochemicals
C. petrocompounds
D. petromolecules


Solution : B

Petrochemicals are the chemical compounds derived from petroleum and natural gas. Products such as gasoline, fertilisers, cosmetics, etc. are products made from or with the aid of petrochemicals.

Question 10

Natural gas is mostly made up of ______.

A. methane
B. propane
C. butane
D. ethane


Solution : A

Natural gas is made up of hydrocarbons such as methane, ethane, propane, etc. Among these, methane makes up a major percentage of natural gas; while others are present in lesser percentage.