NCERT Solutions For Class 8 Science Chapter 4 Combustion And Flame MCQs

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NCERT Solutions For Class 8 Science Chapter 4 Combustion And Flame Multiple Choice Questions

Question 1. Bunsen burner contains a gas X which burns with a blue flame. What is the reason behind the blue coloured flame?

  1. Complete combustion of gas X
  2. Presence of impurities in the gas
  3. Low temperature of the flame
  4. Incomplete combustion of gas X

Answer: 1. Carbon dioxide

Question 2. Unburnt carbon particles are present in the

  1. Luminous flame
  2. Non-luminous flame
  3. Dark flame
  4. Flickering flame

Answer: 1. Luminous flame

NCERT Solutions for Combustion and Flame MCQs Class 8

Question 3. Which is the hottest zone in a candle flame?

  1. Blue zone
  2. Yellow zone
  3. Dark zone
  4. Grey zone

Answer: 1. Blue zone

Question 4. What is the main product of the incomplete combustion of coal?

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

Answer: 1. Carbon dioxide

NCERT Solutions for Class 8 Science Combustion and Flame MCQs

Question 5. The calorific value of a fuel is expressed in a unit called

  1. kilojoule per litre
  2. kilojoule per milliliter
  3. kilojoule per gram
  4. kilojoule per kilogram

Answer: 4. kilojoule per kilogram

NCERT Solutions For Class 8 Science Chapter 4 Combustion And Flame MCQs

Question 6. Which one among the following is considered the cleanest fuel?

  1. Cowdung cake
  2. Petrol
  3. Kerosen
  4. Hydrogen gas

Answer: 4. Hydrogen gas

NCERT Solutions for Combustion and Flame Chapter 4 MCQs

Question 7. In villages, people use wood as fuel because

  1. It is considered to be an ideal fuel
  2. Of its easy availability and low cost
  3. It is environmentally friendly
  4. It catches fire easily

Answer: 2. Of its easy availability and low cost

NCERT Solutions For Class 8 Science Chapter 4 Combustion and Flame Review Exercise Multiple Choice Questions

Question 8. Shyam was cooking potato curry on a chulha. To his surprise, he observed that the copper vessel was getting blackened from the outside. It may

  1. Proper combustion of fuel
  2. Improperly cooked potato curry
  3. Improper combustion of the fuel
  4. Burning of a copper vessel

Answer: 3. Improper combustion of the fuel

Question 9. Which one of the following has the highest calorific value?

  1. Kerosene
  2. Biogas
  3. LPG
  4. Petrol

Answer: 3. LPG

Combustion and Flame Class 8 NCERT MCQs

Question 10. Our beautiful Taj Mahal is suffering from ‘marble cancer’. Acid rain reacts with marble and limestone to form calcium sulfate. It causes damage to big sculptures and marble constructions. Identify the gases that contribute to the formation of acid rain.

  1. Nitrogen oxides and carbon oxides
  2. Carbon dioxide and carbon monoxide
  3. Sulphur oxides and carbon oxides
  4. Nitrogen oxides and sulphur oxides

Answer: 4. Nitrogen oxides and sulphur oxides

Question 11. Which of the following cases is an example of spontaneous combustion?

  1. Lighting a gas store
  2. A car engine starting
  3. A pile of dry leaves catching fire in summer
  4. A chemical reaction in the laboratory

Answer: 3. Carbon dioxide

Combustion and Flame Class 8 MCQs and Answers

Question 12. Which type of combustion is characterised by a lack of oxygen during the burning process?

  1. Spontaneous combustion
  2. Incomplete combustion
  3. Rapid combustion
  4. Controlled combustion

Answer: 2. Incomplete combustion

Question 13. What is the minimum temperature at which a substance catches fire and burns on its own?

  1. Boiling point
  2. Melting point
  3. Ignition temperature
  4. Freezing point

Answer: 3. Ignition temperature

NCERT Chapter 4 Combustion and Flame MCQs Class 8

Question 14. Which of the following fire extinguishers is suitable for tackling electrical fires?

  1. Water fire extinguisher
  2. Foam fire extinguisher
  3. Carbon dioxide fire extinguisher
  4. Powder fire extinguisher

Answer: 3. Carbon dioxide fire extinguisher

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