CBSE Class 8 Science Chapter 4 Combustion And Flame MCQs

CBSE Class 8 Science Chapter 4 Combustion And Flame Review Exercise Multiple Choice Questions

Question 1. Combustion is a process that

1. Releases Light And Heat
2. Absorbs Light And Heat
3. Produces Only Heat
4. Produces Only Light

Answer: 1. Releases Light And Heat

Question 2. Combustion is generally

1. A Physical Process
2. A Chemical Process
3. Both 1 And 2
4. None Of These

Answer: 2. A Chemical Process

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Question 3. The product(s) of combustion is or are

1. Only Oxygen
2. Oxygen And Water
3. Carbon Dioxide And Water
4. Only Carbon Dioxide

Answer: 3. Carbon Dioxide And Water

Question 4. Magnesium ribbon, on burning in air, produces

1. Magnesium Oxide, Water, And Light
2. Magnesium Oxide And Heat
3. Magnesium Oxide, Heat, And Light
4. Magnesium Oxide, Water, And Heat

Answer: 3. Magnesium Oxide, Heat, And Light

Question 5. Coal burns with

1. Flame
2. Only Glow
3. Both Flame And Glow
4. None Of These

Answer: 2. Only Glow

Question 6. The substance that does not burn with flame is

1. LPG
2. Camphor
3. Dry Grass
4. Charcoal

Answer: 4. Charcoal

Question 7. Which of these materials is combustible?

1. Steel
2. Wood
3. Glass
4. Marble

Answer: 2. Wood

Question 8. Which of the following is not a combustible substance?

1. Camphor
2. Glass
3. Straw
4. Alcohol

Answer: 2. Glass

Question 9. A substance that reacts with oxygen, giving heat, is called a combustible substance. Which one of the following is a combustible substance?

1. Iron nail
2. Glass
3. Stone piece
4. Wood

Answer: 4. Wood

Question 10. If a person’s clothes catch fire, the best way to extinguish the fire is to

1. Throw water on the clothes
2. Use a fire extinguisher
3. Cover the person with a woolen blanket
4. Cover the person with a polythene sheet

Answer: 3. Cover the person with a woolen blanket

Question 11. The substance expected to have the highest Ignition temperature out of the following is

1. Kerosene
2. Petrol
3. Coal
4. Alcohol

Answer: 3. Coal

Class 8 Science Chapter 4 Combustion And Flame

Question 12. Water was poured over a large oil fire to extinguish it. What would happen and why?

1. The fire will be put off since water extinguishes fires
2. The fire will spread since oil floats on water
3. The fire will be put off since water dissolves oil
4. The fire will spread since water contains hydrogen, which is a combustible gas

Answer: 2. The fire will spread since oil floats on water

Question 13. In a fire extinguisher, which substance is commonly used for cutting off the oxygen supply to the fire?

1. Water
2. Sand
3. Carbon dioxide
4. Gasoline

Answer: 3. Carbon dioxide

Question 14. On placing an inverted tumbler over a burning candle, the flame extinguishes after some time. This is because of the non-availability of

1. Oxygen
2. Water vapour
3. Carbon dioxide
4. Wax

Answer: 1. Carbon dioxide

Question 15. When a lighted candle placed partly in a trough of water is covered by an inverted glass, water rushes up as shown, and the flame extinguishes. If the above hypothesis is true, what will happen after the candle blows out in the new experimental setup?

1. The mouse will die or show signs of suffocation
2. The mouse will become more active
3. The glass will break, and the mouse will escape
4. There will be no change in the mouse’s behaviour

Answer: 1. The mouse will die or show signs of suffocation