Semiconductor Physics and Diodes MCQs

Question 1

A forward biased pn junction has a resistance of the

Accepted Answer

order of fl

Answer

order of kfl

Answer

order of MU

Answer

none of the above

Question 2

The battery connections required to forward bias a pn junction are

Accepted Answer

+ve terminal to p and ?ye terminal to n

Answer

?ye terminal to p and +ve terminal to n

Answer

?ye terminal to p and ?ye terminal to n

Answer

none of the above

Question 3

The barrier voltage at a pn junction for germanium is about

Accepted Answer

0.3 V

Answer

3.5 V

Answer

3 V

Answer

zero

Question 4

A reverse biased pn junction has

Accepted Answer

almost no current

Answer

very narrow depletion layer

Answer

very low resistance

Answer

large current flow

Question 5

A reverse biased pn junction has resistance of the

Accepted Answer

order of MU

Answer

order of

Answer

order of Ica

Answer

none of the above

Question 6

The leakage current in a pn junction is of the order of

Accepted Answer

tA

Answer

A

Answer

mA

Answer

kA

Question 7

In an intrinsic semicoductor, the number of free electrons

Accepted Answer

equals the number of holes

Answer

is greater than the number of holes

Answer

is less than the number of holes

Answer

none of the above

Question 8

At room temperature, an intrinsic semiconductor has

Accepted Answer

a few free electrons and holes

Answer

many holes only

Answer

many free electrons only

Answer

no holes or fre electrons

Question 9

The impurity commonly used for realizing the base region of a silicon n-p-n transistor is

Accepted Answer

Boron

Answer

Gallium

Answer

Indium

Answer

Phosphorus