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If the item has two terminals, it may be diode, a LED, a resistor or a capacitor. Make a series circuit with a battery, reversing key, the item and the multimeter with range set in milliamperes. Then

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If pointer moves when voltage is applied in one way and does not move when reversed and there is light emission, the item is a LED.

All the above

If pointer moves when voltage is applied in one way and does not move when reversed and there is no light emission, the item is a diode.

If pointer moves when voltage is applied in one way and also when reversed, the item is a resistor.

answer is D.

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Detailed Solution

Experimental diode in reversed bias donor conduct LED works when it is in forward biased and resistor has no dependency on battery polarity.

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