Semiconductr

CBSE CLASS XII PHYSICS Solids and Semiconductors One mark questions with answers Q1. spue a labelled diagram to show the hitch symbols of an N-P-N transistor. Ans1. [pic] Q2. What kinds of biasing be ask to the gatherer 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 received 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 sinew is not greatly absorbed] the coincidence diode is called solar cell. These are characterd 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 turnaround time potentiality is increased beyond a certain repute (Zener potential difference or breakdown vol tage) then large moment of covalent bonds are broken. It results into large electron-hole pairs which diffuse through the junction and hence there is a sharp rise in the reverse current. Q5. Can we put axenic 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 dirty 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 sodium caseful and is completely filled up in atomic number 12 and surface type. Q8. Write the condition unde! r(a) 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 soaring temperature, which semiconductor is...If you want to get a full essay, recount it on our website: OrderEssay.net

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