Lakhmir singh solutions science class 8 Solutions for Chapter 5 coal and petroleum

Exercises in Chapter 5 coal and petroleum Grade 8

Exercise

Questions in Exercise

Name three useful products of coal.

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

Name the process by which plant material (or vegetation) buried deep under the earth was slowly converted into coal

Name any five substances used in everyday life that are manufactured starting from the products of coal tar.

Name the product of coal which is a thick black liquid having an unpleasant smell.

Name an important source from which naphthalene balls are obtained.

Which substance is used for metalling the roads these days in place of coal tar?

Name the most common fuel used in light motor vehicles.

Name the fuel which is used in jet aircraft engines

Name the petroleum product used to drive heavy vehicles.

Name the petroleum product which is commonly used for electric generators.

What is the full form of LPG?

Is it possible to extract petroleum from under the sea bed?

What is the full form of CNG?

Name the major component of natural gas.

Name any two places in India where natural gas is found.

Name a fossil fuel other than coal and petroleum.

Name two places in India where coal is found.

Name the petroleum product used for surfacing of roads.

Name any four places in India where petroleum is found.

Write the full form of PCRA.

State whether the following statements are true or false:

(a) Coke is almost pure of carbon.

(b) Coal tar is a mixture of various substances.

(d) CNG is more polluting than petrol.

(e) Fossil fuels can be made in the laboratory

Fill in the following blanks with suitable words:

(a) Fossil fuels are __________ and ________.

(b) Coal contains mainly ___________.

(d) The process of separation of different constituents from petroleum is ____________.

(e) The least polluting fuel for vehicle is ______________.

(f) The burning of fossil fuel causes air _____ and also causes global ______.

Explain why fossil fuels are exhaustible natural resources.

Describe how coal was formed. What is this process called?

What happens when coal is heated in the air? State the uses of coal.

State the uses of coke.

What are the constituents of coal gas? State one use of coal gas.

What are the major products (or fractions) of petroleum refining? Give one use of each petroleum product.

What are the advantages of using natural gas (or CNG) as a fuel?

State the various uses of natural gas.

What is CNG? State its one use.

Where is the natural gas found? Why is natural gas called clean fuel?

What are the advantages of using LPG as fuel?

Name any five useful substances which are manufactured from petrochemicals.

Which material is called ‘black gold’? Why?

(a) Where and when was the world’s first oil well drilled?

(b) Where and when was oil first struck in India?

State one use each of the following products of petroleum:

(a) Petroleum Gas

(b) Petrol

(d) Lubricating Oil

(e) Bitumen

What is the major cause of air pollution? Write the various tips for minimizing the wastage of petrol/diesel while driving vehicles

Why should we use fossil fuels only when absolutely necessary?

State (a) two uses of kerosene, and (b) two uses of paraffin wax.

What is meant by inexhaustible natural resources? Name two inexhaustible natural resources.

What is meant by exhaustible natural resources? Name any two exhaustible natural resources.

(a) What is petroleum? Where does petroleum occur?

(b) Describe the process of the formation of petroleum.

(a) What are petrochemicals? Name any two petrochemicals.

(b) Why are petro-chemicals so important?

Which one of the following is not a fossil fuel?

(a) Petrol

(b) Coke

(d) Coal

The major component of LPG is:

(a) Hydrogen

(b) Carbon monoxide

(d) Butane

Which is the major component of CNG?

(a) Ethane

(b) Propane

(d) Butane

The gas which occurs above the petroleum oil trapped under the rocks is called:

(a) Biogas

(b) Petroleum gas

(d) Coal gas

Which of the following is being used as a source of hydrogen gas needed to manufacture fertilizers?

(a) Biogas

(b) Natural gas

(d) Petroleum gas

(a) What are fossil fuels? Name three fossil fuels.

(b) Describe how fossil fuels were formed.

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Chapters in this book

Crop Production And Management

Microorganisms: Friends and Foe

Synthetic Fibres And Plastics

Materials: Metals and Non-Metals

Coal And Petroleum

Combustion And Flame

Conservation Of Plants And Animals

Cell Structure And Its Functions

Reproduction In Animals

Reaching The Age Of Adolescence

Force and Pressure

Friction

Sound

Chemical Effect Of Electric Current

Some Natural Phenomena

Light

Stars And The Solar System

Pollution Of Air And Water