Combustion and Flame
Question
Question 1 : Acid rain is occurs due to :-
1. oxides of chlorine
2. oxides of sulphur
3. both oxides of nitrogen & oxides of sulphur
4. oxides of nitrogen
Answer
Correct Anaswer : 3
Explanation:
Acid rain occurs due to oxide of sulphur and oxide of nitrogen. Oxide of sulphur combine with water to form sulphuric acid and oxide of nitrogen form nitric acid with water.
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Question 2 : Low ignition temperature is the cause for :
1. global warming
2. easy transport
3. easy storage
4. fire hazards
Answer
Correct Anaswer : 4
Explanation:
The temperature at which substance start burning is called ignition temperature. Low ignition temperature may cause fire hazards.
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Question 3 : Most common fire extinguisher is :
1. water
2. sand
3. flame
4. soil
Answer
Correct Anaswer : 1
Explanation:
Water is most common fire extinguisher as it cut the oxygen supply and lowers the temperature. Water is not used as fire extinguisher in case of electric fire. Soil and sand is also used as fire extinguisher.
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Question 4 : Find the odd one out :
1. carbon dioxide fire extinguisher
2. soda acid fire extinguisher
3. oxygen fire extinguisher
4. foam fire extinguisher
Answer
Correct Anaswer : 3
Explanation:
There is different kind of fire extinguisher like soda acid fire extinguisher, foam fire extinguisher and carbon dioxide fire extinguisher . Oxygen is not used as fire extinguisher because it is one of the component of combustion only.
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Question 5 : When supply of air is insufficient burning of methane will produce :
1. water and carbon monoxide
2. water and carbon dioxide
3. oxygen and carbon monoxide
4. hydrogen and carbon dioxide
Answer
Correct Anaswer : 1
Explanation:
When supply of air is insufficient burning of methane will produce water and carbon monoxide. In presence of sufficient supply of air carbon dioxide is produced.
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