## 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 ElectronicsPDF

Q1. What is the number of possible crystal systems?
(a) 5
(b) 7
(c) 14
(d) 16

Q2. The material most commonly used to manufacture electronic solid state devices is :
(a) copper
(b) silicon
(c) germanium
(d) aluminium

Q3. A p-type semiconductor is:
(a) negatively charged
(b) positively charged
(c) uncharged
(d) None of these

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

Q5. Crystal diode is:
(a) amplifying device
(b) fluctuating device
(c) non-linear device
(d) 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

Q8. Winch of the following gate is not an universal gate?
(a) OR
(b) NOT
(c) AND
(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

Q10. In intrinsic semiconductor at room temperature, the number of electrons and holes are:
(a) equal
(b) unequal
(c) infinite
(d) zero

Q11. p-n junction diode can be used as:
(a) amplifier
(b) oscillator
(c) detector
(d) modulator

Q12. On heating, resistance of semiconductors:
(a) decreases
(b) increases
(c) remains same
(d) first increases then 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

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

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

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.

Q17. To obtain electrons as majority charge carriers in a semiconductors the impurity mixed is:
(a) monovalent
(b) divalent
(c) trivalent
(d) pentavalent

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

Q19. Main function of a transistor is to :
(a) rectify
(b) simplify
(c) amplify
(d) all the above

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

Q22. Number of electrons in the valence shell of a semiconductor is:
(a) 1
(b) 2
(c) 3
(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

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.