CBSE : NCERT Solutions for Class 12 Physics Chapter 14 Semiconductor Electronics MCQ’s with Answers
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NCERT Physics MCQs for Class 12 Question and Answers Chapter 14 Semiconductor Electronics PDF
Q1. What is the number of possible crystal systems?
(a) 5
(b) 7
(c) 14
(d) 16
Answer:(b) 7
Q2. The material most commonly used to manufacture electronic solid state devices is :
(a) copper
(b) silicon
(c) germanium
(d) aluminium
Answer:(b) silicon
Q3. A p-type semiconductor is:
(a) negatively charged
(b) positively charged
(c) uncharged
(d) None of these
Answer:(c) uncharged
Q4. The part of a transistor which is heavily doped to produce a large number of majority carriers is :
(a) base
(b) emitter
(c) collector
(d) None of these
Answer:(b) emitter
Q5. Crystal diode is:
(a) amplifying device
(b) fluctuating device
(c) non-linear device
(d) linear device
Answer:(c) non-linear device
Q6. 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
Q7. Zener diode is used for:
(a) producing oscillations in a oscillator
(b) amplification
(c) stabilisation
(d) rectification
Answer:(c) stabilisation
Q8. Winch of the following gate is not an universal gate?
(a) OR
(b) NOT
(c) AND
(d) NAND
Answer:(d) NAND
Q9. In full wave rectifier, input a.c. current has a frequency v. The output frequency of current is :
(a) V/2
(b) V
(c) 2V
(d) None
Answer:(c) 2V
Q10. In intrinsic semiconductor at room temperature, the number of electrons and holes are:
(a) equal
(b) unequal
(c) infinite
(d) zero
Answer:(a) equal
Q11. p-n junction diode can be used as:
(a) amplifier
(b) oscillator
(c) detector
(d) modulator
Answer:(c) detector
Q12. On heating, resistance of semiconductors:
(a) decreases
(b) increases
(c) remains same
(d) first increases then decreases
Answer:(a) decreases
Q13. In semi conductor which are responsible for conduction:
(a) only electron
(b) electron and hole both
(c) only hole
(d) None of these
Answer:(b) electron and hole both
Q14. 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
Q15. 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
Q16.In the middle of the depletion layer of a reverse biased p-n junction, the:
(a) electric field is zero
(b) potential is maximum
(c) electric field is maximum
(d) potential zero.
Answer:(d) potential zero.
Q17. 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
Q18. 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
Q19. Main function of a transistor is to :
(a) rectify
(b) simplify
(c) amplify
(d) all the above
Answer:(c) amplify
Q20. In reverse biasing:
(a) large amount of current flows
(b) no current flows
(c) potential barrier across junction increases
(d) depletion layer resistance increases
Answer:(c) potential barrier across junction increases
Q21. 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
Q22. Number of electrons in the valence shell of a semiconductor is:
(a) 1
(b) 2
(c) 3
(d) 4
Answer:(d) 4
Q23. 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:(a) 1 Mev
Q24. In a good conductor, the energy levels in a valence band:
(a) are partially filled only.
(b) overlap with conduction band only.
(c) both (a) and (b) are correct.
(d) none of these
Answer:(c) both (a) and (b) are correct.
Q25. The Voltage gain is highest for
(a) common emitter amplifier
(b) common base amplifier
(c) common collector amplifier.
(d) Equal in all the three.
Answer:(c) common collector amplifier.
We hope that the given NCERT Physics MCQs for Class 12 Question and Answers Chapter 14 Semiconductor Electronics Free Pdf download will help you in gaining knowledge on the subject.
