Semiconductor Materials – 2 – 4

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

ANSWER

EXPLANATION

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

ANSWER

EXPLANATION

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

ANSWER

EXPLANATION

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

ANSWER

EXPLANATION

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

ANSWER

EXPLANATION

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