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CBSE 8th Science Combustion and Flame Model Questions Papers Study Material - QB365 Set C

Published on: 21/10/2025

Question Set C

CBSE 8th Science Combustion and Flame Model Questions Papers Study Material - QB365

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Std: 8th Standard CBSE - Science

chapter: Combustion and Flame - Model Questions Papers

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Questions:

Generic 3

1 x 3 = 3

Make a labelled diagram of a candle flame.

Multiple Choice Question

5 x 1 = 5

The product(s) of combustion is/are

(a)

only oxygen

(b)

oxygen and water

(c)

carbon dioxide and water

(d)

only carbon dioxide

Combustion is generally

(a)

a physical process

(b)

a chemical process

(c)

Both(a) and (b)

(d)

None of these

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

On placing an inverted tumbler over a burning candle. the flame extinguishes after sometime. This is because of non-availability of

(a)

oxygen

(b)

water vapours

(c)

carbon dioxide

(d)

wax

The substance that does not burn with flame is

(a)

LPG

(b)

camphor

(c)

dry grass

(d)

charcoal

1 Marks

5 x 1 = 5

What is calorific value?

Define inflammable substance.

Define ignition temperature.

10.

Name two combustible substances.

11.

What is combustion?

Generic 2

1 x 2 = 2

12.

What are the characteristics of an ideal fuel?

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Answers Key:

Generic 3

1 x 3 = 3

Multiple Choice Question

5 x 1 = 5

(b)
a chemical process

(d)
kilojoule per kilogram

(a)
oxygen

(d)
charcoal

1 Marks

5 x 1 = 5

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

()
The substance that has very low ignition temperature and can easily catch fire with a flame is called inflammable substance.

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

10.

()

11.

()
A chemical process in which a substance burns in the presence of oxygen to release heat is called combustion.

Generic 2

1 x 2 = 2

12.

Characteristics of an ideal fuel:
(i) It is readily available, cheap and can easily be transported.
(ii) It burns easily, has higher calorific value and does not leave behind any undesirable substances.