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Class 8 Science Chapter 6 Combustion And Flame Quiz 4 (25 MCQs)

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1. The non-luminous zone of the flame is the innermost zone which is used by goldsmiths for melting gold and silver.
2. Are the molecules in wood the same as ash
3. The hottest zone in the candle flame is
4. The hottest zone of a candle flame is
5. One of the following is not a combustible substance. The substance is:
6. The zone that produces yellow light in the candle flame is
7. Which one of the following is combustible?
8. Bitumen is used in
9. What is the process of burning substances in the presence of oxygen to produce heat and light?
10. The products of combustion of a hydrocarbon are:
11. Which zone represents the partial combustion in candle flame?
12. Incomplete combustion of fuel in a furnace is judged by high ..... of the flue gases.
13. When magnesium ribbon is burnt, it produces .....
14. Which of the following is not a byproduct of combustion of hydrocarbons?
15. Which of the following statements are true?1. Yellow flames are ideal for heating2. The substances which vaporise during burning gives flames3. Luminous zone contains unburnt carbon particles4. The non-luminous zone has the highest temperature
16. What is the role of oxygen in the combustion process?
17. Calculate the maximum theoretical temperature (t) attained when hydrogen is burnt in oxygen. The heat of combustion of hydrogen to water vapour is 57.8 Kcals. The specific heat of water vapour is [ 0.463 + 6.2x 10$^{-5}$t] t cals/g.
18. Which element shows spontaneous combustion
19. Like fuel the sun also provides heat and light. the process taking place in the sun is called
20. Combustion is a ..... process
21. Why do we use paper or kerosene oil to start fire in wood or coal
22. Which is the hottest part of a flame
23. Fuel can be (understand and give the answer)
24. Fuel formed under the earth's surface by the decomposition of organic matter is called
25. Good fuel is
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