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At a certain reverse bias voltage, zener diode allows current to flow through it and hence maintains the voltage supplied to any load. It is used for stabilisation.

1. (a) At a certain reverse bias voltage, zener diode allows current to flow through it and hence maintains the voltage supplied to any load. It is used for stabilisation.
2. (b) Zener diode does not allow current to flow through it.
3. (c) In semiconductors, the conduction band is empty and the valence band is completely filled at 0 K. No electron from valence band can cross over to conduction band at 0 K. At room temperature some electrons in the valence band jump over to the conduction band due to the small forbidden gap, i.e. 1 eV.
4. (d) None of the above.

Correct answer: (a) At a certain reverse bias voltage, zener diode allows current to flow through it and hence maintains the voltage supplied to any load. It is used for stabilisation.

Solution

The zener diode is specifically designed to allow current to flow in the reverse direction when the reverse bias voltage exceeds a certain value, called the breakdown voltage. This property makes it useful for voltage stabilization.

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