Page 1 - HA 3

SAI International School

Subject - Chemistry
Class - VIII

Topic – Combustion and Flame

Q. No. Questions Skill Marks
1. Which one of the following is a combustible substance? U 1
a. Iron nail.
b. Glass.
c. Stone piece.
d. Wood.
2. The substance expected to have the highest ignition U 1
temperature out of the following is
a. Kerosene.
b. Petrol.
c. Coal.
d. Alcohol.
3. The calorific value of a fuel is expressed in a unit called . 1
a. Kilojoule per litre.
b. Kilogram per mililitre.
c. Kilojoule per gram.
d. Kilojoule per kilogram.
4. Choose the correct option from the following: U + A 1
(a) If both Assertion and Reason are correct and Reason is the
correct explanation of Assertion.
(b) If both Assertion and Reason are correct, but Reason is not
the correct explanation of Assertion.
(c) If Assertion is correct but Reason is incorrect.
(d) If Assertion is incorrect but Reason is correct.
(e) If Assertion & Reason both are incorrect.
Assertion (A): Kerosene oil does not catch fire on its own at
room temperature.
Reason (R): A combustible material cannot catch fire as long
as its temperature is lower than its ignition temperature.
5. Assertion (A): Phosphorus burns in air at room temperature. U + A 1
Reason (R): It is an example of spontaneous combustion.
6. How carbon dioxide can control fire? U 1
7. It is difficult to burn a heap of green leaves but dry leaves catch U 1
fire easily. Explain.
8. Ram and Shyam were studying about combustion and flame. R + A 3
The teacher asked them, what would be the conditions
necessary for combustion to take place? Help Ram and Shyam
in getting the answer.
9. i. Which zone of a flame does a goldsmith use for melting U + R 2 + 1 =
gold and silver and why? 3
ii. What is combustion?