The diagram shows a tester consisting of a battery and LED whose open ends are dipped in a liquid. It is observed that even after some time, LED does not glow. Could it be due to the liquid being

Vinegar

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Molten salt

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Molten iron

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Pure cold water

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Solution

The correct option is D Pure cold water
Since the LED does not glow, it is evident that there is no flow of a current in the tester. Except cold water all others are good conductors of electricity. Therefore, the liquid must be cold water which does not allow the current to pass through it.

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The diagram shows a tester consisting of a battery and LED whose open ends are dipped in a liquid. It is observed that even after some time, LED does not glow. Could it be due to the liquid being

The correct option is D Pure cold waterSince the LED does not glow, it is evident that there is no flow of a current in the tester. Except cold water all others are good conductors of electricity. Therefore, the liquid must be cold water which does not allow the current to pass through it.

The correct option is D Pure cold water
Since the LED does not glow, it is evident that there is no flow of a current in the tester. Except cold water all others are good conductors of electricity. Therefore, the liquid must be cold water which does not allow the current to pass through it.