Class 8 Science Chapter 4 Combustion And Flame Very Short Answer Questions
Question 1. Which type of substances produce flame? Does charcoal burn with flame?
Answer: The substances that vaporise during burning produce flame. No, charcoal does not burn with flame; it glows only.
Question 2. What are the products obtained when combustion takes place?
Answer: The products of combustion are carbon dioxide, water vapour, heat, and light.
Read And Learn More CBSE Class 8 Science Very Short Questions And Answers
Question 3. Name the substance that gives heat and light after combustion.
Answer: The substance that provides heat and light is called fuel
Question 4. If you burn a candle and a coal, what is the difference in their burning?
Answer: A Candle burns with a flame, whereas coal burns by producing light in the form of a glow.
Question 5. How is heat produced in our body?
Answer: In our body, food is broken down by reaction with oxygen. During such reactions, heat is produced. This heat keeps our body warm.
Question 6. Name two fuels that we use in our homes for cooking food.
Answer: Two fuels which we use in our homes for cooking food are LPG and kerosene oil.
Question 7. Like fuels, the Sun also provides heat and light. What is the source of heat and light in the Sun?
Answer: In the Sun, heat and light are produced by nuclear reactions.
Question 8. Out of kerosene oil or wood, which has a higher ignition temperature?
Answer: Wood has a higher ignition temperature than kerosene oil.
Question 9. In what form can CO2 be stored in cylinders?
Answer: CO2 can be stored in cylinders in liquid form.
Question 10. Do all the substances catch fire at the same temperature?
Answer: No, different substances need different temperatures to catch fire due to their different ignition temperature.