Match the columns A B (a) Biogas (i) A liquid fraction from the refining of petroleum (b) Natural gas (ii) The lowest-boiling fraction in petroleum refining (c) Petroleum gas (iii) Accumulated in petroleum wells (d) Kerosene (iv) Anaerobic fermentation of cattle dung

Biogas is produced using the process of anaerobic fermentation, which is fermentation in the absence of air, of cattle dung and domestic sewage. From this fermentation, a mixture of methane, carbon dioxide, hydrogen and hydrogen sulphide is obtained, of which methane is the main constituent. Natural gas is accumulated in the petroleum well in the soil bed. Natural gas is mostly methane, which burns completely, producing carbon dioxide and water vapour. Petroleum gas is the lowest-boiling fraction in petroleum refining. It is used domestic fuel like LPG. Boiling range of it is below 40 ° C . A liquid fraction from the refining of petroleum is kerosene. It is used as domestic fuel. Boiling range of it is 170 - 250 ° C . A B (a) Biogas (i) Anaerobic fermentation of cattle dung (b) Natural gas (ii) Accumulated in petroleum wells (c) Petroleum gas (iii) The lowest-boiling fraction in petroleum refining (d) Kerosene (iv) A liquid fraction from the refining of petroleum

E M B I B E

Basic Science for Class 8>Chapter 7 - Combustion and Fuels>Exercises

Amarnath Mishra, Geeta Mehta, Rajesh Mohan and, Deepti Lehri Solutions for Chapter: Combustion and Fuels, Exercise 1: Exercises

Author:Amarnath Mishra, Geeta Mehta, Rajesh Mohan & Deepti Lehri

Amarnath Mishra Science Solutions for Exercise - Amarnath Mishra, Geeta Mehta, Rajesh Mohan and, Deepti Lehri Solutions for Chapter: Combustion and Fuels, Exercise 1: Exercises

Attempt the practice questions on Chapter 7: Combustion and Fuels, Exercise 1: Exercises with hints and solutions to strengthen your understanding. Basic Science for Class 8 solutions are prepared by Experienced Embibe Experts.

Questions from Amarnath Mishra, Geeta Mehta, Rajesh Mohan and, Deepti Lehri Solutions for Chapter: Combustion and Fuels, Exercise 1: Exercises with Hints & Solutions

EASY

8th CBSE

IMPORTANT

Basic Science for Class 8>Chapter 7 - Combustion and Fuels>Exercises>Q D

A log of wood attains the ignition temperature _____ than wood shavings do. (Faster/ Slower)

MEDIUM

8th CBSE

IMPORTANT

Basic Science for Class 8>Chapter 7 - Combustion and Fuels>Exercises>Q D

In the liquid state, hydrogen is used as a fuel in _____. (train / satellite / bus / spacecraft)

EASY

8th CBSE

IMPORTANT

Basic Science for Class 8>Chapter 7 - Combustion and Fuels>Exercises>Q D

Gaseous fuels are _____ than solid and liquid fuels. (better/worse)

MEDIUM

8th CBSE

IMPORTANT

Basic Science for Class 8>Chapter 7 - Combustion and Fuels>Exercises>Q E

Which among the following fuels has the highest calorific value?

MEDIUM

8th CBSE

IMPORTANT

Basic Science for Class 8>Chapter 7 - Combustion and Fuels>Exercises>Q E

Which of the following is not derived from a fossil fuel?

MEDIUM

8th CBSE

IMPORTANT

Basic Science for Class 8>Chapter 7 - Combustion and Fuels>Exercises>Q E

The main constituent of coal is

MEDIUM

8th CBSE

IMPORTANT

Basic Science for Class 8>Chapter 7 - Combustion and Fuels>Exercises>Q E

Among other things, a good fuel should have a

HARD

8th CBSE

IMPORTANT

Basic Science for Class 8>Chapter 7 - Combustion and Fuels>Exercises>Q F

Match the columns

	$A$		$B$
(a)	Biogas	(i)	A liquid fraction from the refining of petroleum
(b)	Natural gas	(ii)	The lowest-boiling fraction in petroleum refining
(c)	Petroleum gas	(iii)	Accumulated in petroleum wells
(d)	Kerosene	(iv)	Anaerobic fermentation of cattle dung

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