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- 1. Fill in the Blank
Name the most common fire extinguisher.
- 2. Fill in the Blank
What is the unit for expressing the calorific value of a fuel?
- 3. Multiple Choice
Which of the following fuels is used for running automobiles?
(a) CNG
(b) Petrol
(c) Both (a) and (b)
(d) Wood
- 4. Multiple Choice
Magnesium burns to form
(a) calcium carbonate
(b) magnesium oxide
(c) calcium oxide
(d) magnesium sulphate
- 5. Multiple Choice
Name the chemical process in which a substance reacts with oxygen to give out heat.
(a) Reaction
(b) Junction
(c) Combustion
(d) All of these
- 6. Multiple Choice
Combustible substances are also known as
(a) inflammable
(b) flaming
(c) illuminous
(d) non-flammable
- 7. Multiple Choice
In the sun, light and heat are produced by
(a) chemical reactions
(b) nuclear reactions
(c) burning reactions
(d) bunsen burner
- 8. Multiple Choice
Lowest temperature at which a substance catches fire is known as
(a) lowest temperature
(b) burning temperature
(c) ignition temperature
(d) flaming temperature
- 9. Multiple Choice
Which of the following are required essentially for producing fire?
(a) Glass, coal, water
(b) Fuel, coal, straw
(c) Fire, wood, burner
(d) Fuel, air, heat
- 10. Multiple Choice
LPG means
(a) Liquefied Petroleum Gas
(b) Liquefied Petrol Gas
(c) Liquid Petrol Godown
(d) Liquid Petroleum Gas
- 11. Multiple Choice
‘Firework’ is an example of
(a) rapid combustion
(b) explosion
(c) spontaneous combustion
(d) slow combustion
- 12. Multiple Choice
Which of the following has Highest calorific value?
a) LPG
b) Karosene
c) CNG
d) Petrol
- 13. Multiple Choice
What is the colour of flame of LPG?
a) Green
b) Blue
C) Orange
d) Black
- 14. Fill in the Blank
The substance which vapourises during burning gives _________ .
- 15. Fill in the Blank
The _________ zone of a flame is the hottest.
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