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CBSE 12th Standard Physics Subject Semiconductor Electronics Materials Devices And Simple Circuits HOT Questions 1 Mark Questions 2021

Published on: 27/05/2021

QB365 Provides the HOT Question Papers for Class 12 Physics, and also provide the detail solution for each and every HOT Questions. HOT Questions will help to get more idea about question pattern in every exams and also will help to get more marks in Exams

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Std: 12th Standard CBSE - Physics

chapter: - HOT Questions

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Questions:

Generic 2

4 x 2 = 8

The graph shown in the figure represents a plot of current versus voltage for a given semiconductor. Identify the region, if any, over which the semiconductor has a negative resistance.

What is the condition for the state of saturation of a transistor?

Why are photodiodes used preferably in reverse bias condition?

How does the energy gap of an intrinsic semiconductor vary, when doped with a trivalent impurity?

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Answers Key:

Generic 2

4 x 2 = 8

Resistance of a material can be found out by the slope of the curve V versus I. Part BC of the curve shows the negative resistance as with the increase in current, there is a decrease in voltage

The transistor is in saturation state if \(\\ I_{ b }\beta _{ a.c }\ge I_{ c } \). In this condition, during the positive half cycle of a.c. signal, the current \(I_{ b }\) increases resulting an increase in \(I_{ c },\) which is so large that \(V_{ CE }\). becomes less than \(V_{ BE }\). Due to it, the transistor goes into saturation state and no longer works as an amplifier.

In reverse bias condition of photodiode, the change in saturation reverse current is directly proportional to the change in the incident light flux or light intensity, which can be measured accurately. It is not so when photodiode is forward biased.

When an intrinsic semiconductor is doped with the impurity atoms of valency three like indium or boron, some allowed energy levels are produced, situated in the energy gap slightly above the valence band. These levels are called acceptor energy levels.