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WorksheetsQUIZ 2 ON CHAPTER 6 COMBUSTION AND FLAME
Total questions: 10
Worksheet time: 5mins
Which of the following statement is not correct about carbon dioxide acting as a fire extinguisher for electrical fires ?
(a) it is heavier than air
(b) it is lighter than air
(c) it is not combustible
(d) it does not support combustion
Fires in underground coal mines usually occur due to the :
(a) explosive combustion
(b) deliberate combustion
(c) spontaneous combustion
(d) rapid combustion
The calorific value of a fuel is 150000 kJ/kg. This fuel is most likely to be :
(a) biogas
(b) methane
(c) hydrogen gas
(d) liquefied petroleum gas
Which of the following burns without producing a flame ?
(a) camphor
(b) charcoal
(c) cooking gas
(d) kerosene
Which of the following gas does not contribute to the formation of acid rain ?
(a) nitrogen monoxide
(b) carbon monoxide
(c) sulphur dioxide
(d) nitrogen dioxide
If the clothes of a person working in the kitchen catch fire, then to extinguish the fire :
(a) sand should be thrown over the burning clothes
(b) water should be thrown over the burning clothes
(c) polyester blanket should be used to cover the burning clothes
(d) A blanket should be used to cover the burning clothes
(a) A fuel must be heated to its (a) before it starts burning.
e) The amount of heat evolved when 1 kg of a fuel is burnt completely is called its (a)
Which zone of a candle flame is the hottest ?
middle zone
outer zone
inner zone
all zones
(d) A liquid fuel used in homes is (a)
