EASY
8th CBSE
IMPORTANT
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The outermost zone of a candle flame is the:

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Important Questions on Combustion and Flame

EASY
8th CBSE
IMPORTANT
Lakhmir Singh's SCIENCE FOR CLASS 8>Chapter 6 - Combustion and Flame>Multiple Choice Questions (MCQs)>Q 74
The flame of a kerosene oil lamp (or lantern) has:
HARD
8th CBSE
IMPORTANT
Lakhmir Singh's SCIENCE FOR CLASS 8>Chapter 6 - Combustion and Flame>Multiple Choice Questions (MCQs)>Q 75
A lot of dry powder of one of the following chemicals can be released over a fire to extinguish it. This chemical is :
MEDIUM
8th CBSE
IMPORTANT
Lakhmir Singh's SCIENCE FOR CLASS 8>Chapter 6 - Combustion and Flame>Questions Based on High Order Thinking Skills (HOTS)>Q 76
An electric spark is struck between two electrodes placed near each other in a closed tank full of petrol. Will petrol catch fire? Explain your answer.
HARD
8th CBSE
IMPORTANT
Lakhmir Singh's SCIENCE FOR CLASS 8>Chapter 6 - Combustion and Flame>Questions Based on High Order Thinking Skills (HOTS)>Q 77
Give a reason for the following:
Paper by itself catches fire easily whereas a piece of paper wrapped around an aluminium pipe does not.
HARD
8th CBSE
IMPORTANT
Lakhmir Singh's SCIENCE FOR CLASS 8>Chapter 6 - Combustion and Flame>Questions Based on High Order Thinking Skills (HOTS)>Q 78
Abida and Ramesh want to heat water taken in separate beakers. Abida kept the beaker near the wick in the yellow part of the candle flame. Ramesh kept the beaker in the outermost part of the flame. Whose water will get heated in a shorter time? Why?
MEDIUM
8th CBSE
IMPORTANT
Lakhmir Singh's SCIENCE FOR CLASS 8>Chapter 6 - Combustion and Flame>Questions Based on High Order Thinking Skills (HOTS)>Q 79
When a lot of dry powder of a substance X is released over a fire, the fire gets extinguished.
Write the chemical name of the substance X.   (Sodium hydrogen carbonate / Sodium carbonate)
HARD
8th CBSE
IMPORTANT
Lakhmir Singh's SCIENCE FOR CLASS 8>Chapter 6 - Combustion and Flame>Questions Based on High Order Thinking Skills (HOTS)>Q 79
When a lot of dry powder of a substance X is released over a fire, the fire gets extinguished.
How does X extinguish the fire?
MEDIUM
8th CBSE
IMPORTANT
Lakhmir Singh's SCIENCE FOR CLASS 8>Chapter 6 - Combustion and Flame>Questions Based on High Order Thinking Skills (HOTS)>Q 79

When a lot of dry powder of a substance X is released over a fire, the fire gets extinguished.
Name another substance which behaves like X.(potassium salt)

(Potassium bicarbonate/Potassium chloride)