SEBA Class 8 Science Important Chapter 5 Combustion and Flame

SEBA Class 8 Science Important Chapter 5 Combustion and Flame Solutions English Medium As Per SEBA New Syllabus to each chapter is provided in the list so that you can easily browse through different chapters SEBA Class 8 General Science Additional Solutions and select need one. SCERT Important Solutions For Class 8 General Science Download PDF. Important Notes for Class 8 Science SCERT.

SEBA Class 8 Science Important Chapter 5 Combustion and Flame

Also, you can read the NCERT book online in these sections Solutions by Expert Teachers as per Central Board of Secondary Education (CBSE) Book guidelines. Assam SEBA Board Class 8 Science Additional Question Answer are part of All Subject Solutions. Here we have given SCERT Class 8 General Science Important Notes for All Chapters, You can practice these here.

Combustion and Flame

Chapter: 5

PART – I

IMPORTANT QUESTION ANSWER

A. Very Short Type Question & Answer:

1. What is combustion?

Ans: Combustion is a chemical process in which a substance reacts with oxygen to produce heat, and sometimes light.

2. What is a combustible substance?

Ans: A substance that undergoes combustion is called a combustible substance or fuel.

3. What is ignition temperature?

Ans: The lowest temperature at which a substance catches fire is called its ignition temperature.

4. Give two examples of inflammable substances.

Ans: Petrol and alcohol.

5. Name the three conditions necessary for combustion.

Ans: Fuel, oxygen (air), and heat (to reach ignition temperature).

6. What is rapid combustion?

Ans: A type of combustion where a substance burns quickly with the production of heat and light.

7. What is spontaneous combustion?

Ans: When a substance catches fire on its own without any external flame or spark, it is called spontaneous combustion.

8. Why is CO₂ used to control fire?

Ans: CO₂ is heavier than oxygen and cuts off the air supply, also reducing temperature, thus extinguishing the fire.

9. Why does a matchstick not catch fire on its own?

Ans: Because the temperature of the matchstick remains below its ignition temperature at room temperature.

10. Why does the paper cup with water not burn?

Ans: The water absorbs the heat and keeps the paper’s temperature below its ignition temperature.

B. Fill in the Blanks:

1. The process of burning a substance in oxygen is called _________.

Ans: Combustion.

2. A substance that burns in air is called a _________ substance.

Ans: Combustible.

3. The lowest temperature at which a substance catches fire is its _________.

Ans: Ignition temperature.

4. Petrol, alcohol, and LPG are examples of _________ substances.

Ans: Inflammable.

5. Combustion cannot occur without _________.

Ans: Oxygen.

C. True or False:

1. Coal burns with a flame.

Ans: False.

2. All substances have the same ignition temperature.

Ans: False.

3. Magnesium burns with a bright white flame.

Ans: True.

4. CO₂ is an effective fire extinguisher.

Ans: True.

5. Water is suitable for putting out oil fires.

Ans: False.