Question:
Three lamps A, B and C as shown in the figure above are burning using oil as its source of energy. Three incense sticks, E, F and G are taken. E is dipped in oil, F is dipped in petrol and G is dipped in water and are immediately placed over the wick of A, B and C respectively. Then
Three lamps A, B and C as shown in the figure above are burning using oil as its source of energy. Three incense sticks, E, F and G are taken. E is dipped in oil, F is dipped in petrol and G is dipped in water and are immediately placed over the wick of A, B and C respectively. ThenUpdated On: Aug 21, 2026
- A will be put off, B will glow bright and C will be put off
- A will be put off, B will glow bright and C will be put off
- A, B and C will keep glowing
- C will be put off and the status of A and B be cannot determined
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The Correct Option is B
Approach Solution - 1
To solve this problem, we need to consider the effects of different substances on the combustion process of oil lamps:
- Lamp A: The incense stick E is dipped in oil and placed on Lamp A. Oil is a flammable substance that aids combustion. However, when the wick is soaked with excess oil, it doesn't allow sufficient air to mix with the fuel, thereby hindering the combustion process. Consequently, Lamp A will be put off.
- Lamp B: The incense stick F is dipped in petrol and placed on Lamp B. Petrol is highly volatile and combusts easily, enhancing the burning process and increasing brightness. Therefore, Lamp B will glow bright.
- Lamp C: The incense stick G is dipped in water and placed on Lamp C. Water is a combustion inhibitor, and it cools down the wick, disrupting the combustion process. Hence, Lamp C will be put off.
Thus, the correct conclusion is that A will be put off, B will glow bright and C will be put off.
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Approach Solution -2
Whether a flame at a wick brightens, keeps burning normally, or is smothered depends on how easily the liquid poured onto that wick can catch fire and mix with the surrounding air, that is, how volatile the liquid is.
Lamp A has incense stick E, dipped in oil, placed on its wick. Oil is the same fuel the lamp already burns and is not especially volatile, so adding more of it around the wick chokes the local air supply the flame needs rather than boosting it, putting the flame out. Lamp B has incense stick F, dipped in petrol, placed on its wick. Petrol is highly volatile, evaporating and mixing with air almost instantly, so it feeds the flame extra combustible vapour and makes it burn brighter. Lamp C has incense stick G, dipped in water, placed on its wick. Water does not burn at all and instead cools the wick and blocks oxygen from reaching it, putting the flame out.
So Lamp A is put out, Lamp B glows brighter, and Lamp C is put out.
- Option A (A off, B bright, C off): This matches the outcome worked out above exactly.
- Option B (A off, B bright, C off): This is the identical outcome, also matching what was worked out above.
- Option C (A, B and C will keep glowing): This does not match, since both A and C are put out rather than kept glowing, so this is incorrect.
- Option D (C off, A and B undetermined): This does not match either, since the state of every lamp can in fact be determined, so this is incorrect.
Lamp A is put out, Lamp B burns brighter, and Lamp C is put out, matching the described outcome.
the correct answer is Option B: A will be put off, B will glow bright and C will be put off.
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