Which of the following statements is correct for the identification of a diode using a multimeter?
Answer & explanation
Correct answer: option 2
The correct answer is Option (2) → The multimeter displays current in one direction only
A p-n junction diode has a low resistance in forward bias and a very high resistance in reverse bias. When the multimeter leads are connected across it one way and then reversed, current is shown in one direction only, which identifies the component as a diode.
Option (2) The multimeter displays current in one direction only — Correct. Current flows when the diode is forward biased and practically none when the leads are reversed.
NCERT (2026-27):
p-n Junction Diode Under Reverse Bias – “… The above discussion shows that the p-n junction diode primerly allows the flow of current only in one direction (forward bias). The forward bias resistance is low as compared to the reverse bias resistance. This property is used for rectification of ac voltages as discussed in the next section.”