Case Study Questions for Class 8 Science Chapter 6 Combustion and Flame

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Home CBSE Class 8 Science Case Study Qs Case Study Questions for Class 8 Science Chapter 6 Combustion and Flame

Case Study Questions for Class 8 Science Chapter 6 Combustion and Flame

Here we are providing case study questions for CBSE Class 8 Science Chapter 6 Combustion and Flame.

Case Study Questions

Question 1:

Read the passage carefully and attempt the questions given below.

A chemical process in which a substance reacts with oxygen to give off heat is called combustion. The substance that undergoes combustion is said to be combustible. It is also called a fuel. The fuel may be solid, liquid or gas. Sometimes, light is also given off during combustion, either as a
flame or as a glow.
The lowest temperature at which a substance catches fire is called its ignition temperature. The substances which have very low ignition temperature and can easily catch fire with a flame are called inflammable substances. Examples of inflammable substances are petrol, alcohol, Liquefied Petroleum Gas (LPG)

i) What are combustible substance?
a) Substance that undergoes combustion
b) Substance reacts with ozone
c)Substance that glows
d) All of these

ii) Fuels can be :
a) Solids only
b) Liquids only
c) Gases only
d) All of these

iii) What is ignition temperature?
a) Lowest temperature at which a substance catches fire.
b) Temperature when water boils
c) Temperature at which ice is formed
d) Temperature of LPG.

iv) Identify the inflammable substance from the following.
a) Soil
b) Water
c) Alcohol
d) Vinegar

v) What are inflammable substances?
a) Substances with low ignition temperature
b) Substances which catches fire easily with a flame
c) Only option a
d) Both a and b

Answers

i) a

ii) d

iii) a

iv) c

v) d

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