Semiconductr

CBSE CLASS XII PHYSICS Solids and Semiconductors One mark questions with answers Q1. resume a labelled diagram to show the tour of duty symbols of an N-P-N transistor. Ans1. [pic] Q2. What kinds of biasing are ask to the accumulator 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 certain 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 rectifying valve is make very thin [incident brawniness is not greatly absorbed] the coincidence diode is called solar cell. These are spendd 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 overturn electromotive force is increased beyond a certain repute (Zener voltage or breakdown voltag e) then large moment of covalent bonds are broken. It results into large electron-hole pairs which diffuse through the junction and thence there is a sharp rise in the reverse current. Q5. Can we put virginal 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 impure 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 magnesium and surface type. Q8. Write the condition infra which forward current flows through the junction diode. Ans8. e(?/kT) > > 1 because the junction diode allow for 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 exalted temperature, which semiconductor is...If you want to get a full essay, tell it on our website: OrderEssay.net

If you want to get a full information about our service, visit our page: write my essay