NCERT Class 12 MCQ Quiz Hub

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1. What is the number of possible crystal systems?




2. The material most commonly used to manufacture electronic solid state devices is :




3. A p-type semiconductor is:




4. The part of a transistor which is heavily doped to produce a large number of majority carriers is :




5. Crystal diode is:




6. Bonds in a semiconductor :




7. Number of electrons in the valence shell of a semiconductor is:




8. Semiconductors of both p-type and n-type are produced by:




9. With fall of temperature, the forbidden energy gap of a semiconductor




10. In a p-type semiconductor, current conduction is by:




11. The relation between number of free electrons (n) in a semiconductor and temperature (T) is given by:




12. n reverse biasing:




13. Main function of a transistor is to :




14. To obtain p-type silicon semiconductor, we need to dope pure silicon with:




15. On applying reverse bias to a junction diode, it:




16. To obtain electrons as majority charge carriers in a semiconductors the impurity mixed is:




17. In the middle of the depletion layer of a reverse biased p-n junction, the:




18. In a common base amplifier the phase difference between the input signal voltage and output voltage is :




19. Energy bands in solids are a consequence of:




20. In semi conductor which are responsible for conduction:




21. In binary system III represents:




22. On heating, resistance of semiconductors:




23. p-n junction diode can be used as:




24. In intrinsic semiconductor at room temperature, the number of electrons and holes are:




25. In full wave rectifier, input a.c. current has a frequency v. The output frequency of current is :




26. Winch of the following gate is not an universal gate?




27. Zener diode is used for:




28. In semi conductor, at room temperature :