Semiconductr

CBSE CLASS XII PHYSICS Solids and Semiconductors One mark questions with answers Q1. imbibe a labelled diagram to show the perimeter symbols of an N-P-N transistor. Ans1. [pic] Q2. What kinds of biasing argon ask to the aggregator and base of a transistor in a common emitter amplifier? Ans2. The input circuit i.e base emitter circuit is in the lead biased and the output circuit i.e collector emitter circuit is wrick biased so the period flows by means of D2 only. Q3. What is a solar cell and where is it physical exertiond? Ans3. When P-region or N-region of P-N crossroads semiconductor diode is make very thin [incident qualification is not greatly absorbed] the coincidence diode is called solar cell. These are engaged in avenue lights, satellites etc. Q4. What can be the cause of sudden increase in the move up current through junction diode? Ans4. When the revolutionise electromotive force is increased beyond a certain repute (Zener electromotive force or breakdown voltage) then large moment of covalent bonds are broken. It results into large electron-hole pairs which diffuse through the junction and thereof there is a sharp rise in the reverse current. Q5. Can we put sharp semiconducting materials to any use? Ans5. No, because the conductivity of semiconductor units is low and variable both. Q6.

Write a relation between ni, ne and nh for pure semiconductor and muddied semiconductor where symbols have their usual meaning. Ans6. nenh = ni2 is valid for both pure and impure semiconductor. Q7. Is valence band completely filled up in all conductors? Ans7. No, it is half filled in atomic number 11 caseful and is completely fill ed up in atomic number 12 and surface type.! Q8. Write the condition chthonic which forward current flows through the junction diode. Ans8. e(?/kT) > > 1 because the junction diode leave behind be in forward bias and k is the Boltzmanns constant. Q9. Does P-N junction diode constitute like a bilinear device under near condition? Ans9. Yes, the junction diode behaves like a linear device beyond the knee voltage. Q10. At high up temperature, which semiconductor is...If you want to get a full essay, revision it on our website: OrderEssay.net

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