(b) Which quality IS STIUWII y unuiQ.16. Name a few fuels used in our homes.Q.17. Name a few fuels used in trade and industry.Q.18. What fuels are used for running automobiles?Q.19. What is the difference between the burning of a candle and burningof a fuel like coal?Q.20. What is combustion?Q.21. Define a fuel?Q.22. () What are the essential condition required for combustion?(ii) What is the essential condition required for extinguishingfire?Q.23. What are inflammable substance? Give examples.Q.24. In what form is LPG stored in cylinders?Q.25. Name the most common fire extinguisher?Q.26. Water is not suitable for extinguishing fires involving electricalequipment oil and petrol. Why?Q.27. Explain how CO, is able to control fires?Q.28. What are the requisites (qualities) of a good ideal) fuel?Q.29. Suppose you are asked to boil a given quantity of water using cowdung cake, coal and LPG as fuels. Which fuel would you prefer?Give your reason.Q.30. Define calorific value of a fuel. Though hydrogen has got highestcalorific value but it is not used as a domestic fuel. Why?Q.31. Make a labeled diagram of a candle flame.Q.32. Name various types of combustion. Give example of each type?0.33. Differentiate between.(a) combustible and non combustible substances(b) Complete combustion and incomplete combustion.(According to syllabus of class8)​