QUIZ 3- SEMICONDUCTORS(PN DIODE)

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1. A diode is said to be in reverse bias when

N-end is at higher potential and P-end is at lower potential

N-end is at lower potential and P-end is at lower potential

N-end is at lower potential and P-end is at higher potential

N-end is at higher potential and P-end is at higher potential

2. This space-charge region on either side of the junction which contain only immobile ions and does not have any free charge carrier

Barrier potential

Drift

Depletion layer

Diffusion

3. Movement of majority charge carriers on either side of the juction due to difference in concentration.

Depletion layer

Drift

Barrier potential

Diffusion

4. The cut-in voltage for silicon diode is approximately

1.1 V

0.6 V

0.2 V

1.4 V

5. The depletion layer in the P-N junction region is caused by

Drift of holes

Diffusion of charge carriers

Migration of impurity ions

Drift of electrons

6. In a PN-junction diode

The current in the reverse biased condition is generally very small~μA

The current in the reverse biased condition is small but the forward biased current is independent of the bias voltage

The reverse biased current is strongly dependent on the applied bias voltage

The forward biased current is very small in comparison to reverse biased current

7. In an unbiased p-n junction, holes diffuses from the p-region to n-region because

free electrons in the n-region attract them.

they move across the junction by the potential difference.

hole concentration in p-region is more as compared to n-region.

All the above.

8. Movement of minority charge carriers on either side of a juction due to junction field.

Barrier potential

Diffusion

Drift

Depletion layer

9. In the forward bias arrangement of a PN-junction diode

The P-end is connected to the negative terminal of battery

The N-end is connected to the positive terminal of the battery

The P-end is connected to the positive terminal of the battery

The direction of current is from N-end to P-end in the diode

10. When a forward bias is applied to a p-n junction, it

raises the potential barrier.

reduces the majority carrier current to zero.

lowers the potential barrier.

None of the above.

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