Semiconductor Physics and Diodes MCQs

Question 1

A zener is rated 20 V, 1 A. It was observed that a change in temperature equal to 100?C resulted in a change in breakdown voltage by 100 mV. Temperature coefficient in percentage is

Accepted Answer

1% per ?C

Answer

5 x 10-7% per ?C

Answer

indeterminate from given data

Answer

none of these

Question 2

Which of the following is used as a passive component in electronic circuits?

Accepted Answer

Capacitor

Answer

Tunnel diode

Answer

Transistor

Answer

Vacuum diode

Question 3

The diameter of an atom is

Accepted Answer

10-10 metre

Answer

10-6 metre

Answer

10-15 metre

Answer

10-21 metre

Question 4

The number of protons in an atom is called its

Accepted Answer

atomic number

Answer

isotope number

Answer

atomic weight

Answer

none of the above

Question 5

Valence electrons are the

Accepted Answer

electrons present in the outermost orbit

Answer

loosely packed electrons

Answer

mobile electrons

Answer

electrons that do not carry and charge

Question 6

Addition of a small amount of antimony to germanium will result in

Accepted Answer

More free electrons than holes in the semiconductor

Answer

Formation of p-type semiconductor

Answer

Antimony concentrating on the edges of the crystal

Answer

Increased resistance

Question 7

The conduction band is

Accepted Answer

A range of energies corresponding to the energies of the free electrons

Answer

Same as forbidden energy gap

Answer

Generally located on the top of the crystal

Answer

Generally located on the bottom of the crystal

Question 8

Which of the following semiconductor is electrically positive?

Accepted Answer

None of the above

Answer

Intrinsic semiconductor

Answer

Extrinsic semi-conductor

Answer

P-type semi-conductor

Question 9

A PN-junction offers

Accepted Answer

Conducts in forward direction only

Answer

High resistance in forward as well as reverse direction

Answer

Low resistance in forward as well as reverse direction

Answer

Conducts in reverse direction only.