Semiconductor Physics – Exercise – 2

96. An atom is made up of

(a) protons.
(b) neutrons.
(c) electrons.
(d) all of the above

Answer
Answer : (d)
Explanation
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97. The maximum number of electrons in each shell of an atom is

(a) 2.
(b) 2n2 where n is the number of the shell.
(c) 4.
(d) 8.

Answer
Answer : (b)
Explanation
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98. An n-type semiconductor material

(a) is intrinsic.
(b) has trivalent impurity atoms added.
(c) has pentavalent impurity atoms added.
(d) requires no doping.

Answer
Answer : (c)
Explanation
Explanation : N-type Semiconductor : An intrinsic semiconductor material is a poor conductor. When a small amount of pentavalent impurity is added to the intrinsic material its conductivity rises sharply. This material formed after the addition of pentavalent impurity to the intrinsic semiconductor material is called N-type material. Addition of small amount of pentavalent atoms in the intrinsic material provides large number of free electrons for conduction. Let us discuss.
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99. For a forward-biased diode, the barrier potential ________ as temperature increases.

(a) decreases
(b) remains constant
(c)
(d)

Answer
Answer : (a)
Explanation
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100. The most common type of diode failure is a(n) ________.

(a) open
(b) short
(c) resistiv
(d)

Answer
Answer : (a)
Explanation
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