question_answer1) Where does the Fermi level lie in a conductor, insulator and semiconductor?
question_answer2) Where does the fermi-level of an intrinsic semiconductor lie?
question_answer3) Why does diamond behave like an insulator?
question_answer6) Why does the conductivity of a semiconductor increase with rise of temperature?
question_answer7) Why does a semiconductor get damaged when a heavy current flows through it?
question_answer8) Why it is difficult to make intrinsic semiconductors?
question_answer9) The conductivity of an intrinsic semi- conductor is very low. Why?
question_answer10) The forbidden energy band of silicon is \[1.1\text{eV}\]. What does it mean?
question_answer11) What is doping in semiconductor? Why is it done?
question_answer12) Why is p-type semiconductor so called?
question_answer13) Why is n-type semiconductor so called?
question_answer14) What is a hole? Which type of doping creates a hole?
question_answer17) Why is germanium preferred over silicon for making semiconductor devices?
question_answer20) Why do Ge and Si behave as semiconductors?
question_answer21) Why are metallic conductors opaque?
question_answer25) Why is a \[p-n\] junction also called a junction diode?
question_answer26) Why does a potential barrier set up across a junction diode?
question_answer30) Can two p-n junction diodes placed back to back work as a p-n-p transistor?
question_answer31) Why is the base region of a transistor made very thin and lightly doped?
question_answer34) Can we interchange emitter and collector of a transistor?
question_answer35) A transistor is a temperature sensitive device. Comment.
question_answer36) A transistor is a current operated device. Comment.
question_answer38) Why is a common emitter amplifier preferred over a common base amplifier?
question_answer39) When is a common base amplifier preferred over a common emitter amplifier?
question_answer41) Under what condition a transistor works as an open switch?
question_answer43) Why a transistor cannot be used as a rectifier?
question_answer46) In a transistor, the forward bias is always smaller than the reverse bias. Why?
question_answer49) Which one of the transistors p-n-p and n-p-n is more useful and why?
question_answer51) Why is a logic gate so called?
question_answer52) Why is a NOT gate known as an inverter?
question_answer58) Why do semiconductors obey Ohm's law for only low fields?
question_answer60) Explain the variation of resistivity with temperature in pure-semiconductors.
question_answer61) What are donor and acceptor energy levels?
question_answer62) What is difference between electron current and hole current?
question_answer71) How is forward biasing different from reverse biasing in a p-n junction?
question_answer82) What is an amplifier? Can a transistor amplifier generate power?
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Which of the following figures give the correct variation of the magnitude of output voltage as a function of the frequency? ( \[{{\upsilon }_{s}}\] does not change with frequency) 
(ii) If the output of the above AND gate is fed to a NOT gate, name the gate of the combination so formed. 
Write down the output at X for the inputs (i) \[A=0,B=0\] and (ii) \[\mathbf{A}\text{ }=\text{ }\mathbf{1},\text{ }\mathbf{B}\text{ }=\text{ }\mathbf{1}.\]
