66. The acceptor atoms in a P-type semiconductor at normal temperature :
(a) Carry a positive charge
(b) Carry a negative charge
(c) Are neutral
(d) Are ions
67. In a semiconductor crystal, if the current flows due to breakage of crystal bonds, then the semiconductor is called :
(a) Acceptor
(b) Donor
(c) Intrinsic semiconductor
(d) Extrinsic semiconductor
68. Drift current in germanium is caused by :
(a) Concentration gradient of charge carriers
(b) Thermal agitation of crystal lattice
(c) Incidence of light energy
(d) Applied electric field
69. In a given semiconductor, Fermi level E is proportional to (n = total number of free electrons per unit volume).
(a) n
(b) n1/2
(c) n2/3
(d) n4/3
70. Resistivity of semiconductor depends on :
(a) The length of the specimen
(b) Cross-sectional area of the specimen
(c) Volume of the specimen
(d) Atomic nature of the semiconductor
Related Posts
Semiconductor Materials » Exercise - 287. In a semiconductor, the energy gap between valence and conduction bands is about ........ (a) 15 eV (b) 100 eV (c) 50 eV (d) 1 eV- Semiconductor Materials » Exercise - 289. In a semiconductor, the energy gap between valence and conduction bands is about ........ (a) 15 eV (b) 100 eV (c) 50 eV (d) 1 eV
- Semiconductor Materials » Exercise - 283. In germanium an electron in the conduction band : (a) Has same energy as an electron in valence band (b) Has less energy as compared to an electron in valence band (c) Has greater energy as compared to an electron in valence band (d) Has zero charge
- Semiconductor Materials » Exercise - 4174. In Intrinsic semi conductor the valence and conduction bands - (a) Overlap with each other (b) Are separated by an energy gap of about 1 eV (c) Are separated by an energy gap of about 10 eV (d) Are separated by an energy gap about 0.001 eV
- 55555555559. When an electron jumps from the valence shell to the conduction band, it leaves a gap. What is this gap called? (a) energy gap (b) hole (c) electron-hole pair (d) recombination