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Semiconductor Materials – 1 – 8

36. In intrinsic semiconductor :

(a) The electron density is twice the hole density
(b) The electron density is thrice the hole density
(c) The electron density is square root of the hole density
(d) The electron density is same as the hole density

Answer
Answer : (d)

Explanation
No answer description available for this question. Let us discuss.

37. The Fermi-Dirac probability function specifying all states at energy E (electron volts) occupied under the thermal equilibrium is given by :

(a) f(E) = KT – ln eE-Ef
(b) f(E) = 1 + eE-Ef
(c) f(E) = 1( 1 + e(E-Ef)/ kT)
(d) f(E) = ((E)/Ef)e-KT

Answer
Answer : (c)

Explanation
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38. At absolute zero temperature, an intrinsic semiconductor behaves like a :

(a) Conductor
(b) Insulator
(c) Semiconductor
(d) Other metals

Answer
Answer : (b)

Explanation
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39. Germanium and silicon are :

(a) Trivalent
(b) Tetravalent
(c) Pentavalent
(d) Covalent

Answer
Answer : (b)

Explanation
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40. A semiconductor has a resistivity which :

(a) Is smaller than 10-2 Ω-cm
(b) Is larger than 10-2 Ω-cm
(c) Varies between 10-2 Ω-cm and 10-9 Ω-cm
(d) None of the above

Answer
Answer : (c)

Explanation
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