Semiconductor Materials – 1 – 1

1. Graphite is a :

(a) conductor
(b) insulator
(c) semiconductor
(d) none of these

ANSWER

EXPLANATION

2. Doping is a process of :

(a) purifying semiconductor material
(b) increasing impurity percentage
(c) removal of foreign atoms
(d) increasing the bias potential

ANSWER

EXPLANATION

3. ……………. is an example of acceptor material.

(a) gallium
(b) arsenide
(c) bismuth
(d) antimony

ANSWER

EXPLANATION

4. Recombination of electrons and holes takes place when :

(a) an electron falls into a hole
(b) a positive ion and a negative ion bond together
(c) avalanche electron becomes a conduction electron
(d) an atom is formed

ANSWER

EXPLANATION

5. The atomic number of silicon is :

(a) 14
(b) 16
(c) 18
(d) 12

ANSWER

EXPLANATION

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