## SEMICONDUCTOR DEVICES–CLASS 12 PHYSICS QUESTION BANK

1. Draw a circuit diagram of OR gate. 2. What is a logic gate? 3. What types of charge-carriers are there in a n-type semi conductor? 4. Give the logical symbol of an AND gate. Mark the inputs and outputs. 5. Draw the logic symbol for a NAND gate. 6. Which biasing will make the…… Continue reading SEMICONDUCTOR DEVICES–CLASS 12 PHYSICS QUESTION BANK

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## Solution to HC Verma Problem

“Referring to HC Verma Part 2, chapter 29, Electric field and potential, Q 69 I think that Force is inversely proportional to square of the distance between the charged particles, so acceleration is not constant and hence v*v  =  u*u  + 2*a*s   is not valid in this case. […]

## Transistor as a Switch

(This is one of the Expected Question for AISSCE Physics 2011) Explain the action of transistor as a switch. To answer this question (with proper understanding) you should have an idea of the three regions in the VI characteristics of a transistor. viz; Cutoff region, Active region and the saturation region. When the input bias of a…… Continue reading Transistor as a Switch

## Law of mass action

When an intrinsic semiconductor is doped with pentavalent impurity, the number of free lectrons increases. Will it result in any change in the number of holes already present? The answer is YES. When the semiconductor is doped with pentavalent impurity, the ne increases and will result in a decrease in nh according to the relation.…… Continue reading Law of mass action

## The difference between electricity and electronics

Electricity is the branch of Physics (?) which deals with the flow of electrons and its effect. The electric bulb, electric iron etc are electric devices as they are based on the direct effects like heating effect of current. Electronics is the branch of Physics (?) which deals with the control of the flow of…… Continue reading The difference between electricity and electronics

## Doping

Doping is the deliberate addition of desirable impurities to an intrinsic semicounductor to modify its conducting propertires. The impurity atoms added are called dopants and the semi conductor so formed is called extrinsic semiconductor. Depending on the type of impurities added, extrinsic semiconduictors are divided into two : n -type and p-type. Note: The extrememly…… Continue reading Doping