CBSE 8th Standard Science Coal and Petroleum Important Questions And Answers Study Material - QB365 Set C | QB365

8th Standard CBSE Syllabus & Materials

8th Standard CBSE

CBSE 8th Social Science Theme D - Factors of Production - New Model Questions Papers Study Material - QB365 Set A

8th Standard CBSE

CBSE 8th Social Science Theme C - Universal Franchise and India's Electoral System - New Model Questions Papers Study Material - QB365 Set A

NEW

8th Standard CBSE

CBSE 8th Social Science Theme B - The Rise of the Marathas - New Model Questions Papers Study Material - QB365 Set A

NEW

8th Standard CBSE

CBSE 8th Social Science Theme B - Reshaping India's Political Map - New Model Questions Papers Study Material - QB365 Set A

NEW

8th Standard CBSE

CBSE 8th Social Science Theme A - Natural Resources and Their Use - New Model Questions Papers Study Material - QB365 Set A

NEW

8th Standard CBSE

CBSE 8th Science Keeping Time with Skies - New Model Questions Papers Study Material - QB365 Set A

CBSE 8th Standard Science Coal and Petroleum Important Questions And Answers Study Material - QB365 Set C

Published on: 29/10/2025

Question Set C

CBSE 8th Standard Science Coal and Petroleum Important Questions And Answers Study Material - QB365

Download CBSE Class 8th Standard CBSE Science question papers, sample papers, important questions, and previous year solved papers in PDF format. Get free study materials, NCERT solutions, and exam preparation resources for Class 8th Standard CBSE Science

Questions + Answers key

Take MCQ Science Test

QB365 Student Learing Managemnet System

Std: 8th Standard CBSE - Science

chapter: Coal and Petroleum - Important Questions And Answers

Visit QB365-SLMS - https://www.qb365.in/slms/ Complete Questions and Answers

Questions:

Generic 3

4 x 3 = 12

Explain the process of formation of petroleum.

Differentiate between regular and diffused reflection. Does diffused reflection mean the failure of the laws of reflection?

Make a labelled diagram of a candle flame.

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

Generic 5

3 x 5 = 15

Write down the names of parts of the eye in the blank spaces shown in fig. below.

What are the three essential requirements to produce fire? How fire extinguisher is useful for controlling the fire?

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

15 x 1 = 15

Which of the following statements is correct regarding rods and cones in the human eye?

(a)

Cones are sensitive to dim light

(b)

Cones are sensitive to bright light

(c)

Rods are sensitive to bright light

(d)

Rods can sense colour

The change in converging power of an eye lensis caused by the action of

(a)

retina

(b)

optic nerve

(c)

ciliary muscles

(d)

iris

10.

We can see a non-luminous object when light

(a)

emitted by the object falls on the eye

(b)

is reflected from the object towards our eye

(c)

completely passes through the object

(d)

gets completely absorbed by the object

11.

Part of the eye which controls the entering of light is called

(a)

iris

(b)

cornea

(c)

lens

(d)

retina

12.

A person cannot see the distant objects clearly, (though) he can see the nearby object clearly. He is suffering from the defect of vision called

(a)

myopia

(b)

hypermetropia

(c)

cataract

(d)

night blindness

13.

The product(s) of combustion is/are

(a)

only oxygen

(b)

oxygen and water

(c)

carbon dioxide and water

(d)

only carbon dioxide

14.

Combustion is generally

(a)

a physical process

(b)

a chemical process

(c)

Both(a) and (b)

(d)

None of these

15.

The calorific value of a fuel is expressed in a unit called

(a)

kilojoule per litre

(b)

kilogram per millilitre

(c)

kilojoule per gram

(d)

kilojoule per kilogram

16.

Which of the following is not a combustible substance?

(a)

Camphor

(b)

Glass

(c)

Straw

(d)

Alcohol

17.

Which one of the following has the highest calorific value?

(a)

Kerosene

(b)

Biogas

(c)

LPG

(d)

Petrol

18.

Which of the following is exhaustible natural resource?

(a)

Water

(b)

Air

(c)

Sunlight

(d)

Coal

19.

When coal burns in air

(a)

carbon monoxide is formed

(b)

sulphur dioxide is formed

(c)

oxygen is formed

(d)

carbon dioxide is formed

20.

Purest form of carbon is

(a)

coal

(b)

charcoal

(c)

coke

(d)

All of these

21.

Which of the following is not a constituent of petroleum?

(a)

Paraffin wax

(b)

Lubricating oil

(c)

Petrol

(d)

Coke

22.

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

1 Marks

5 x 1 = 5

23.

What is lateral inversion?

24.

What are fossil fuels?

25.

What is calorific value?

26.

What is global warming?

27.

Define ignition temperature.

Generic 2

1 x 2 = 2

28.

Write two laws of reflection.

Visit QB365-SLMS - https://www.qb365.in/slms/

Answers Key:

Generic 3

4 x 3 = 12

Petroleum is believed to be formed from organisms living in the sea. As these organisms died, their bodies settled at the bottom of the sea and got covered with layers of sand and clay. Over millions of years, the dead organisms were transformed into petroleum oil and natural gas and other fossil fuels under the conditions of the absence of air, high temperature and high pressure. Like coal, petroleum and natural gas are also fossil fuels.
Since oil and gas are lighter than water and do not mix with it, they move upward. They are stopped by the overlying rocks which they cannot break through.

Differences between regular and diffused reflection are

Regular reflection	Diffused reflection
i) It is caused by the reflection from smooth and shiny surfaces	It is caused by reflection from unpolished and rough surfaces
ii) Reflected rays are parallel to each other	Reflected rays are not parallel to each other

No, the diffused reflection does not mean the failure of the laws of reflection.

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.

Generic 5

3 x 5 = 15

(1) Cornea
(2) Iris
(3) Eye lens
(4) Ciliary muscles
(5) Sclera
(6) Blind Spot.

Three essential requirements to produce fire are as follows:
(i) Fuel
(ii) Air and
(iii) Heat to acquire the ignition temperature. The job of fire extinguisher is to cut off the supply of air or to bring down the temperature of fuel or both. The most common fire extinguisher is water. But water works only when things like wood and paper are on fire. For fires involving electrical equipment and inflammable materials like petrol, carbon dioxide (C0₂) is the best extinguisher. CO₂ being heavier than oxygen, covers the fire like a blanket. Since, the contact between the fuel and oxygen is cut-off, so the fire can be controlled. The added advantage of CO₂ is that in most cases, it does not harm the electrical equipment.

(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

15 x 1 = 15

(b)
Cones are sensitive to bright light

10.

(b)
is reflected from the object towards our eye

11.

(b)
cornea

12.

(a)
myopia

13.

14.

(b)
a chemical process

15.

(d)
kilojoule per kilogram

16.

(d)
Alcohol

17.

18.

(d)
Coal

19.

(d)
carbon dioxide is formed

20.

21.

(d)
Coke

22.

(d)
Wildlife and minerals

1 Marks

5 x 1 = 5

23.

()
In an image formed by a mirror the left side appears on the right side and the right side appears on the left side, this is known as lateral inversion.

24.

()
Some exhaustible natural resources are formed from the dead remains of living organisms. Hence, these are all known as fossil fuels.

25.

()
The amount of heat energy produced on complete combustion of 1kg of a fuel is called its calorific value.

26.

()
The rise in temperature of the atmosphere of the earth due to increased concentration of carbon dioxide in the air is called global warming.

27.

()
The lowest temperature at which a substance catches fire is called its ignition temperature.

Generic 2

1 x 2 = 2

28.

The two laws of reflection:
(i)The incident ray, reflected ray and normal lie in the same plane.
(ii)Angle of incidence is always equal to angle of reflection.