1.A=a,b,p b=2,3 c=p,q,r,s a
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Answer:
16 is answer I hope this answer may help you
Step-by-step explanation:
(a) combustion (b) ignition temperature (c) inflammable substance. 3. State three conditions necessary for combustion. 4. What do you understand by the terms (a) fuel, (b) calorific value? 5. State four characteristics of a good fuel. 6. Draw a diagram showing different zones of a candle flame. Which zone contains: (a) unburnt vapour of wax (b) very hot carbon particles? 7. How has the use of CNG in motor vehicles reduced pollution in the big cities? Explai 8. Compare LPG or CNG as a fuel with coal. 9. Why is water not used in controlling electrical fires? 10. Some paper is wound around (a) a wooden cylinder (b) an aluminium cylinder. Each the cylinders is held over a bunsen flame for 10 seconds. What will you observe? Expla 11. Which zone mof flame is used by goldsmiths to make gold ornaments and why? 12. Calorific value of cowdung cakes is 7000 kJ/kg. How much cowdung cakes are required produce heat energy of 35000 kJ ? 13. 5 kg of a fuel produces 320,000" kj of heat energy on complete combustion. Calculates your answer. calorific value of fuel. 14. Is rusting of iron a combustion process? Give reasons for your answer. 15. Two students A and B heated the same mass of water on a candle flame. The stude A kept the beaker slightly above the flame of the candle and student B kept the bea In which case, the water will get heated close to the wick