Semiconductor Materials » Exercise – 1
6. In a semiconductor, the total current is equal to :
(a) sum of electron and hole currents flow in same direction
(b) sum of electron and hole currents flow in opposite directions
(c) electron current only
(d) hole current onlySubject Name : Electronics Engineering Exam Name : IIT GATE, UPSC ESE, RRB, SSC, DMRC, NMRC, BSNL, DRDO, ISRO, BARC, NIELIT Posts Name : Assistant Engineer, Management Trainee, Junior Engineer, Technical Assistant Electronics & Communication Engineering Books
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- 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 6. In a semiconductor, the total current is equal to : (a) sum of electron and hole currents flow in same direction (b) sum of electron and hole currents flow in opposite directions (c) electron current only (d) hole current only 7. The minority holes are about ……… that of electron. (a) half (b) same (c) twice (d) thrice 8. Germanium and silicon are : (a) trivalent (b) tetravalent (c) pentavalent (d) covalent 9. The volume charge density of mobile carriers is expressed in : (a) coulombs / cubic meters (b) coulombs /…