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Question

Which of the following statements is not true?
  1. CO2 is the best fire extinguisher.
  2. Burning of coal and diesel releases sulphur dioxide gas.
  3. Global warming can cause acid rain.
  4. LPG has higher calorific value than biogas.

A
CO2 is the best fire extinguisher.
B
LPG has higher calorific value than biogas.
C
Burning of coal and diesel releases sulphur dioxide gas.
D
Global warming can cause acid rain.
Solution
Verified by Toppr

Global warming may cause glaciers to melt, which may lead to the rise in sea level and submerge low-lying areas but does not cause acid rain.

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Q1
Question 22
Indicate whether the following statements are true or false. Also write the false statements in their correct form.
(a) Air is necessary for combustion.
(b) Magnesium is a non-combustible metal.
(c) Carbon dioxide is an excellent fire extinguisher.
(d) Calorific value of wood is higher than that of coal
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Indicate whether the following statements are True or False. Also, write the false statements in their correct form.​
(a) Air is necessary for combustion.​
​(b) Magnesium is a non-combustible metal.
(c) Carbon dioxide is an excellent fire extinguisher.
(d) Calorific value of wood is higher than that of coal.
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Calorific value of wood is higher than that of coal.
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Which of the following is the main cause of global warming ?

(a) nitrogen dioxide

(b) sulphur dioxide

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Q5
Fuel Calorific Value (kj/g)
charcoal 33
coal 25.33
wood 17
diesel 45
kerosene 48
petrol 50
biogas 35 to 40
butane (LPG) 50
methane 55
hydrogen 150

Based on the table above, which of the following is the correct sequence in which the fuels that give out most heat to the least heat energy will be arranged?
(a) hydrogen, wood, coal, biogas, methane
(b) methane, kerosene, diesel, charcoal
(c) coal, kerosene, petrol, hydrogen
(d) hydrogen, butane, diesel, kerosene
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