HARD
8th CBSE
IMPORTANT
Earn 100

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?

Important Questions on Combustion and Flame

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)

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 80
What type of combustion is represented by burning of white phosphorus in air at room temperature? (Spontaneous combustion/ Non-spontaneous combustion)
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 80
What type of combustion is represented by burning of LPG in a gas stove? (Spontaneous combustion/Rapid combustion)
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 80
What type of combustion is represented by ignition of a cracker?
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 80
What type of combustion is represented by the burning of coal dust in a coal mine? (Spontaneous combustion/Non-Spontaneous combustion)