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SAI International School

Subject - Chemistry
Class - VIII

Topic – Combustion and Flame
Practice Worksheet-2

Q. No. Questions Skill Marks
1. Which of the following has the lowest ignition temperature? U 1
a. Petrol.
b. Wax.
c. Paper.
d. Wood.
2. Which of these is not a greenhouse gas? U 1

a. Carbon dioxide.
b. Nitrogen.
c. Ozone.
d. Water vapour.
3. Burning of wood cause air pollution which can lead to U 1

a. Respiratory diseases.
b. Diabetes.
c. Cataract.
d. Hair loss.
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): Greenhouse effect is important to maintain the
right temperature of the earth.
Reason (R): Greenhouse effect casues depletion in the ozone
layer.
5. Assertion (A): LPG is a good fuel. U + A 1
Reason (R): It has higher calorific value.
6. How does pouring of water extinguishes fire? U 1
7. Why respiration is called a slow combustion? U 1
8. Write down three characteristics of LPG R + A 3
9. Write about the three types of combustion. U + R 3
10. Write down the causes of greenhouse effect. Also explain R + U 5
them.

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