Combustion and Flame [CBSE (Central Board of Secondary Education) Class-8 Science]: Questions 1 - 7 of 33
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Question 1
Question MCQ▾
Combustion is caused by the rapid union of oxygen with hydrogen or carbon in the oil or coal is called as:
Choices
Choice (4) | Response | |
---|---|---|
a. | Spontaneous combustion | |
b. | Rapid explosion | |
c. | Explosion | |
d. | None of the above |
Question 2
Question MCQ▾
A device used to stop fire is called:
Choices
Choice (4) | Response | |
---|---|---|
a. | Rapid combustion | |
b. | Sand bucket | |
c. | Ideal fuel | |
d. | Fire extinguisher |
Question 3
Question MCQ▾
Fire extinguishers used at airports and petrol pumps based on the principle of:
Choices
Choice (4) | Response | |
---|---|---|
a. | Smothering the fire | |
b. | Cooling the fire | |
c. | All of the above | |
d. | Question does not provide sufficient data or is vague |
Question 4
Question MCQ▾
The substances with low ignition temperature are called as:
Choices
Choice (4) | Response | |
---|---|---|
a. | Inflammable substance | |
b. | Fuel | |
c. | Flammable substance | |
d. | None of the above |
Question 5
Question MCQ▾
Harmful gases released during combustion are:
Choices
Choice (4) | Response | |
---|---|---|
a. | Water gas | |
b. | Carbon monoxide, carbon dioxide | |
c. | Producer gas | |
d. | Hydrogen, nitrogen, |
Question 6
Question MCQ▾
Substances used for producing heat energy are called as:
Choices
Choice (4) | Response | |
---|---|---|
a. | Flame | |
b. | Combustion | |
c. | Fire | |
d. | Fuel |
Question 7
Question MCQ▾
Combustion occurs rapidly is called as:
Choices
Choice (4) | Response | |
---|---|---|
a. | Explosion | |
b. | Rapid combustion | |
c. | Spontaneous combustion | |
d. | All of the above |