Identify the correct statements.(i) Carbon dioxide is used to extinguish fires involving oil and petrol(ii) Sand is used for extinguishing fires caused by oil.(iii) Fires caused by short-circuit should not be put off by sprinkling water on it.(iv) Water is not the best extinguisher for fires involving petrol and kerosene.(1) (i),(ii) and (iii) (2) (ii) and (iii)(3) (ii) and (iv) (4) All of these
Question
Identify the correct statements.(i) Carbon dioxide is used to extinguish fires involving oil and petrol(ii) Sand is used for extinguishing fires caused by oil.(iii) Fires caused by short-circuit should not be put off by sprinkling water on it.(iv) Water is not the best extinguisher for fires involving petrol and kerosene.(1) (i),(ii) and (iii) (2) (ii) and (iii)(3) (ii) and (iv) (4) All of these
Solution
The correct answer is (4) All of these.
Here's why:
(i) Carbon dioxide is used to extinguish fires involving oil and petrol. This is correct because carbon dioxide is a non-conductive and non-reactive gas, which makes it a good fire suppressant. It works by displacing oxygen in the air, which the fire needs to burn.
(ii) Sand is used for extinguishing fires caused by oil. This is also correct. Sand can be used to smother a fire, cutting off the fire's supply of oxygen and stopping the flames.
(iii) Fires caused by short-circuit should not be put off by sprinkling water on it. This is correct because water can conduct electricity, so using water to put out an electrical fire can be dangerous.
(iv) Water is not the best extinguisher for fires involving petrol and kerosene. This is correct because water can spread the fire by causing the fuel to scatter, making the fire worse. Foam or dry chemical extinguishers are typically used for these types of fires.
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