II. Fill in the Blanks
Fill in the blanks with suitable word/s.
1. The substance which vapourises during burning gives _________ .
2. A good fuel should have _________ calorific value.
3. An example of slow combustion is _________.
4. _________ are substances that release energy on combustion.
5. The most common supporter of combustion is _________.
6. Magnesium burns to change into _________.
7. Wood is an example of _________ fuel.
8. _________ is an example of liquid fuel.
9. Carbon dioxide is _________ than oxygen.
10. Oxides of _________ and nitrogen causes acid rain.
11. The increase in amount of _________ gas in atmosphere results in global warming.
12. Inflammable substances have very low _________ temperature.
13. The _________ zone of a flame is the hottest.
14. During combustion, generally, _________ and _________ energies are produced.
15. LPG has a calorific value of _________ kJ/kg.
Answers
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Eplanation:
1- Flames
2- high
3- digestion
4- Fuels
5- air
6- Magnesium Oxide
7- solid
8- LPG
9- heavier
10- sulphur
11- carbon dioxide
12- ignition
13. outer
14. heat and light
15. 55000 kJ/kg
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