Chemistry-Combustion and Flame [NSTSE (National Science Talent Search Exam- Unified Council) Class 8]: Questions 1 - 6 of 27

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Question 1

Combustion and Flame
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Question

MCQ▾

From which of the following, synthetic petroleum is artificially produced.

Choices

Choice (4)Response
a.Coal
b.Wood
c.L. P. G
d.Petroleum

Question 2

Combustion and Flame
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Question

MCQ▾

When 1 gram of fuel is completely burned, the heat produced is termed as?

Choices

Choice (4)Response
a.Heat capacity
b.Vapour density
c.Boiling point
d.Calorific value

Question 3

Combustion and Flame
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Question

MCQ▾

Which type of reaction is combustion?

Choices

Choice (4)Response
a.Redox reaction
b.Substitution
c.Oxidation
d.Reduction

Question 4

Combustion and Flame
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Question

MCQ▾

When you take a burning wood and you poured water over that burning wood, the fire of wood goes off, because?

Choices

Choice (4)Response
a.The flame vapourises
b.Decrease in temperature of wood
c.Water molecules reacts with oxygen present in that flame.
d.Temperature of water goes-up

Question 5

Combustion and Flame
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Question

MCQ▾

Inspite of having dangerous problems with hydrogen, it is used as fuel for some applications. What are they?

Choices

Choice (4)Response
a.Car fuel
b.Oxyhydrogen flame
c.Rocket fuel
d.All a. , b. and c. are correct

Question 6

Combustion and Flame
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Question

MCQ▾

When fire is caused by burning petrol and oil, then what type of fire extinguishers must be used?

Choices

Choice (4)Response
a. type
b.Water type
c.Soda-acid type
d.Foam type