Semiconductor Physics and Diodes MCQs

Question 1

Reverse current in a silicon junction nearly doubles for every ___ ?C rise in temperature.

Accepted Answer

6

Answer

10

Answer

2

Answer

5

Question 2

Without a dc source, a clipper acts like a

Accepted Answer

rectifier

Answer

clamper

Answer

demodulator

Answer

chopper

Question 3

The primary function of a clamper circuit is to

Accepted Answer

introduce a dc level into an ac signal

Answer

suppress variations in signal voltage

Answer

raise positive half-cycle of the signal

Answer

lower negative half-cycle of the signal

Question 4

The resistivity of pure germanium under standard conditions is about

Accepted Answer

3 x 104 Sr2 cm

Answer

6 x 104 L2 cm

Answer

3 x 106 SI cm

Answer

6 x 10-4 LI cm

Question 5

When a pure semiconductor is heated, its 3V

Accepted Answer

goes down

Answer

goes up

Answer

remains the same

Answer

cannot say

Question 6

The strength of a semiconductor crystal resistance comes from

Accepted Answer

electron-pair bonds

Answer

forces between nuclei

Answer

forces between protons

Answer

none of the above

Question 7

When a penta valent impurity is added to a pure semiconductor, it becomes

Accepted Answer

n-type semiconductor

Answer

an insulator

Answer

an intrinsic semiconductor

Answer

p-type semiconductor

Question 8

A trivalent impurity has electrons.

Accepted Answer

3

Answer

4

Answer

5

Answer

6

Question 9

In a semiconductor, current conduction is due

Accepted Answer

to holes and free electrons

Answer

only to holes

Answer

only to free electrons

Answer

none of the above