8th Standard CBSE Syllabus & Materials
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CBSE 8th Social Science Theme D - Factors of Production - New Model Questions Papers Study Material - QB365 Set A
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CBSE 8th Social Science Theme C - Universal Franchise and India's Electoral System - New Model Questions Papers Study Material - QB365 Set A
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CBSE 8th Social Science Theme B - The Rise of the Marathas - New Model Questions Papers Study Material - QB365 Set A
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CBSE 8th Social Science Theme B - Reshaping India's Political Map - New Model Questions Papers Study Material - QB365 Set A
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CBSE 8th Social Science Theme A - Natural Resources and Their Use - New Model Questions Papers Study Material - QB365 Set A
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CBSE 8th Science Keeping Time with Skies - New Model Questions Papers Study Material - QB365 Set A
Published on: 21/10/2025
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Questions + Answers key
Take MCQ Science Test
1.
Choose the incorrect statement from the following: A good fuel is one which:
is readily available
produces a large amount of heat
leaves behind many undesirable substances
burns easily in air at a moderate rate.
2.
Shyam was cooking potato curry on a chulha. To his surprise. he observed that the copper vessel was getting blackened from outside. It may be due to
proper combustion of fuel
improper cooking of potato curry
improper combustion of the fuel
burning of copper vessel
3.
The product(s) of combustion is/are
only oxygen
oxygen and water
carbon dioxide and water
only carbon dioxide
4.
Coal burns with
flame
only glow
Both flame and glow
None of these
5.
Combustion is generally
a physical process
a chemical process
Both(a) and (b)
None of these
6.
Which one among the following is considered as the cleanest fuel?
Cowdung cake
Petrol
Kerosen
Hydrogen gas
7.
In villages people use wood as fuel because
it is considered to be an ideal fuel
of its easy availability and low cost
it is environment friendly
it catches fire easily
8.
The calorific value of a fuel is expressed in a unit called
kilojoule per litre
kilogram per millilitre
kilojoule per gram
kilojoule per kilogram
9.
Choose the incorrect statement from the following. Forest fires are usually due to
carelessness of humans
heat of Sun
cutting of trees
lightning strike
10.
The substance expected to have the highest ignition temperature out of the following is
kerosene
petrol
coal
alcohol
1.
(b)
produces a large amount of heat
2.
(c)
improper combustion of the fuel
3.
(c)
carbon dioxide and water
4.
(b)
only glow
5.
(b)
a chemical process
6.
(d)
Hydrogen gas
7.
(b)
of its easy availability and low cost
8.
(d)
kilojoule per kilogram
9.
(c)
cutting of trees
10.
(c)
coal
8th Standard CBSE Syllabus & Materials
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