The energy gap of silicon is 1.14 eV. Find the maximum wavelength at which silicon starts energy absorption.

2

(a)

How does the conductivity and resistivity change with rise of temperature in case of intrinsic semiconductors?

2

(a)

Why does the width of depletion layer of a \(p-n\) junction increase in reverse biasing?

2

(a)

Write the truth for the circuit shown in figure below. Name the gate that the circuit resembles.

2

(a)

There are two semiconductor materials A and B which are made by doping germanium crystal with indium and arsenic respectively. As shown in the figure, the junction of two is biased with a battery. Will the junction be forward bias and reverse bias?

2

(a)

Two car generates have a common gate which needs to open automatically when a car enters either of the garages or cars enter both. A circuit, that resembles this situation using diodes for this situation.

2

(a)

Name the semiconductor device that can be used to regulate an unregulated de power supply. With the help of I-V characteristics of this device, explain its working principle.

2

(a)

Draw the output waveform at X, using the given inputs A and B for the logic circuit shown below. Also, identify the logic operation performed by this circuit.

2

(a)

Distinguish between 'intrinsic' and 'extrinsic' semiconductors?

2

(a)

Write the main use of the
(i) photodiode
(ii) Zener diode.

2

(a)

How can you relate drift velocity and mobility of an electron?

2

(a)

For faster action which transistor is used and why?

2

(a)

Express by a truth table the output Y for all possible inputs A and B in the circuit shown below 

2

(a)

Write the truth table for the following logic circuit shown in the figure below.

2

(a)