Semiconductor Materials » Exercise – 1
1. Graphite is a :
(a) conductor
(b) insulator
(c) semiconductor
(d) none of these
2. Doping is a process of :
(a) purifying semiconductor material
(b) increasing impurity percentage
(c) removal of foreign atoms
(d) increasing the bias potential
3. ……………. is an example of acceptor material.
(a) gallium
(b) arsenide
(c) bismuth
(d) antimony
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
5. The atomic number of silicon is :
(a) 14
(b) 16
(c) 18
(d) 12
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