MEDIUM
8th CBSE
IMPORTANT
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Acid rain contains _____.

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Important Questions on Combustion, Flame and Fuels

EASY
8th CBSE
IMPORTANT
Expanded Universal Science>Chapter 6 - Combustion, Flame and Fuels>ASSESSMENT ZONE>Q B
_____ are obtained from natural fuels by various physical and chemical processes.
MEDIUM
8th CBSE
IMPORTANT
Expanded Universal Science>Chapter 6 - Combustion, Flame and Fuels>ASSESSMENT ZONE>Q B
_____ of the fuel is the heat liberated when one gram of fuel burns completely in oxygen.
EASY
8th CBSE
IMPORTANT
Expanded Universal Science>Chapter 6 - Combustion, Flame and Fuels>ASSESSMENT ZONE>Q B
_____ is a region where combustion of fuel takes place. (Flame/ Vacuum)
MEDIUM
8th CBSE
IMPORTANT
Expanded Universal Science>Chapter 6 - Combustion, Flame and Fuels>ASSESSMENT ZONE>Q B
If the amount of oxygen present is limited, it results in the _____ combustion of fuel. (incomplete/complete)
MEDIUM
8th CBSE
IMPORTANT
Expanded Universal Science>Chapter 6 - Combustion, Flame and Fuels>ASSESSMENT ZONE>Q B
Ideal fuel has _____ calorific value. (low/ high)
MEDIUM
8th CBSE
IMPORTANT
Expanded Universal Science>Chapter 6 - Combustion, Flame and Fuels>ASSESSMENT ZONE>Q B
Water is not suitable for fire caused due to _____. (fireworks / electrical short circuit)
MEDIUM
8th CBSE
IMPORTANT
Expanded Universal Science>Chapter 6 - Combustion, Flame and Fuels>ASSESSMENT ZONE>Q B
_____ (Explosive / Rapid / spontaneous) combustion occurs when a substance unexpectedly bursts into flame and can cause a serious fire.
EASY
8th CBSE
IMPORTANT
Expanded Universal Science>Chapter 6 - Combustion, Flame and Fuels>ASSESSMENT ZONE>Q C
Complete combustion takes place in the presence of air.