Semiconductor Physics and Diodes MCQs

Question 1

In PN junction, the region containing the uncompensated acceptor and donor ions is called

Accepted Answer

Depletion region

Answer

Transition zone

Answer

Neutral region

Answer

Active region

Question 2

In a reverse biased P-N junction, the current through the junction increases abruptly at

Accepted Answer

Breakdown voltage

Answer

Zero voltage

Answer

1.2 V

Answer

0.72 V

Question 3

Maximum rectification efficiency for a half wave rectifier is

Accepted Answer

40.60%

Answer

100%

Answer

88%

Answer

50%

Question 4

The maximum rectification efficiency in case of full wave rectifier is

Accepted Answer

81.20%

Answer

100%

Answer

66.60%

Answer

40.60%

Question 5

A full wave bridge rectifier is supplied voltage at 50 Hz. The lowest ripple frequency will be

Accepted Answer

100 Hz

Answer

400 Hz

Answer

200 Hz

Answer

50 Hz

Question 6

For signal diodes the PIV rating is usually in the range

Accepted Answer

30 V to 150 V

Answer

1 V to 10 V

Answer

10 V to 30 V

Answer

150 V to 400 V

Question 7

In N-type semi-conductor

Accepted Answer

electrons are majority carriers while holes are minority carriers

Answer

electrons are minority carriers while holes are majority carriers

Answer

both electrons as well as holes are majority carriers

Answer

both electrons as well as holes are minority carriers

Question 8

A semi-conductor that is electrically neutral

Accepted Answer

has equal amount of positive and negative charges

Answer

has no majority carriers

Answer

has no minority carriers

Answer

has no free charge carriers

Question 9

In case of selenium, under the influence of varying light intensity

Accepted Answer

electrical conductivity changes

Answer

emf is generated due to chemical reaction

Answer

emf is generated due to physical reaction

Answer

the number of electrons liberated