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Semiconductor Electronics: Materials, Devices And Simple Circuits Class 12 MCQs Questions with Answers
Number of electrons in the valence shell of a semiconductor is
(a) 1
(b) 2
(c) 3
(d) 4
Answer: (d) 4
With fall of temperature, the forbidden energy gap of a semiconductor
(a) increases
(b) decreases
(c) sometimes increases and sometimes decreases
(d) remains unchanged
Answer: (d) remains unchanged
The relation between number of free electrons (n) in a semiconductor and temperature (T) is given by:
(a) n ∝ T
(b) n ∝ T²
(c) n ∝ T1/2
(d) n ∝ T3/2
Answer: (d) n ∝ T3/2
On applying reverse bias to a junction diode, it
(a) lowers the potential barrier
(b) raise the potential barrier
(c) increases the majority carrier current
(d) increases the minority carrier current
Answer: (b) raise the potential barrier
To obtain electrons as majority charge carriers in a semiconductors the impurity mixed is
(a) monovalent
(b) divalent
(c) trivalent
(d) pentavalent
Answer: (b) divalent
In a common base amplifier the phase difference between the input signal voltage and output voltage is
(a) π/2
(b) 0
(c) π/4
(d) π
Answer: (b) 0
In binary system III represents
(a) 1
(b) 3
(c) 7
(d) 100
Answer: (c) 7
In a semiconductor, the forbidden energy gap between the valence band and the conduction band is of the order of
(a) 1 Mev
(b) 1 ev
(c) 0.1 Mev
(d) 5ev
Answer: (b) 1 ev
In an n-p-n transistor circuit the collector current is 18 mA. If 90% of the electrons emitted reach the collector, than the emitter current is:
(a) 1.6 mA
(b) 16.4 mA
(c) 18 mA
(d) 20 mA
Answer: (c) 18 mA
The part of the transistor which is heavily doped to produce a large number of majority carriers is
(a) emitter
(b) base
(c) collector
(d) none
Answer: (a) emitter
An oscillator is an amplifier with
(a) a large gain
(b) Negative feedback
(c) positive feedback
(d) no feedback
Answer: (c) positive feedback
How many AND gates are required to form, NAND gate?
(a) 0
(b) 1
(c) 2
(d) 4
Answer: (b) 1
Semiconductors of both p-type and n-type are produced by
(a) ionic solids
(b) covalent solids
(c) metallic solids
(d) molecular solids
Answer: (b) covalent solids
In a p-type semiconductor, current conduction is by
(a) atoms
(b) holes
(c) electrons
(d) protons
Answer: (b) holes
On applying reverse bias to a junction diode, it
(a) lowers the potential barrier
(b) raise the potential barrier
(c) increases the majority carrier current
(d) increases the minority carrier current
Answer: (b) raise the potential barrier
p-n junction diode can be used as
(a) amplifier
(b) oscillator
(c) detector
(d) modulator
Answer: (c) detector
In semi conductor, at room temperature
(a) the valence bond is partially empty and the conduction band is partially filled
(b) the valence band is completely filled and the conduction band is partially filled
(c) the valence band is completely filled
(d) the conduction band is completely empty
Answer: (a) the valence bond is partially empty and the conduction band is partially filled
Energy bands in solids are a consequence of
(a) Ohm’s Law
(b) Pauli’s exclusion principle
(c) Bohr’s theory
(d) Heisenberg’s uncertainty principle
Answer: (b) Pauli’s exclusion principle
Which of following statements is not true?
(a) Resistance of an intrinsic semiconductor decreases with increase in temperature
(b) Doping pure Si with trivalent impurities gives p-type semiconductor
(c) The majority carriers in n-type semiconductor are holes
(d) A p-n junction can act as semiconductor diode
Answer: (c) The majority carriers in n-type semiconductor are holes
In principle, Boolean algebra is based on
(a) simple numbers
(b) binary numbers
(c) logic
(d) truth
Answer: (c) logic
What is the number of possible crystal systems?
(a) 5
(b) 7
(c) 14
(d) 16
Answer: (b) 7
A p-type semiconductor is
(a) negatively charged
(b) positively charged
(c) uncharged
(d) None of these
Answer: (c) uncharged
Crystal diode is
(a) amplifying device
(b) fluctuating device
(c) non-linear device
(d) linear device
Answer: (c) non-linear device
Which of the following gate is not an universal gate?
(a) OR
(b) NOT
(c) AND
(d) NAND
Answer: (d) NAND
In intrinsic semiconductor at room temperature, the number of electrons and holes are
(a) equal
(b) unequal
(c) infinite
(d) zero
Answer: (a) equal
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