# Balbharati solutions for Physics 12th Standard HSC Maharashtra State Board chapter 16 - Semiconductor Devices [Latest edition]

## Chapter 16: Semiconductor Devices

Exercises
Exercises [Pages 363 - 364]

### Balbharati solutions for Physics 12th Standard HSC Maharashtra State Board Chapter 16 Semiconductor Devices Exercises [Pages 363 - 364]

Exercises | Q 1.1 | Page 363

Choose the correct option:

In a BJT, the largest current flow occurs ______.

• In the emitter

• In the collector

• In the base

• Through CB junction

Exercises | Q 1.2 | Page 363

Choose the correct option:

A Series resistance is connected in the Zener diode circuit to ______.

• Properly reverse bias the Zener

• Protect the Zener

• Properly forward bias the Zener

Exercises | Q 1.3 | Page 363

Choose the correct option:

A LED emits visible light when its ______.

• Junction is reverse biased

• Depletion region widens

• Holes and electrons recombine

• Junction becomes hot

Exercises | Q 1.4 | Page 363

Choose the correct option.

Solar cell operates on the principle of ______.

• Diffusion

• Recombination

• Photovoltaic action

• Carrier flow

Exercises | Q 1.5 | Page 363

Choose the correct option:

A logic gate is an electronic circuit which ______.

• Makes logical decisions

• Allows electron flow only in one direction

• Works using binary algebra

• Alternates between 0 and 1 value

Exercises | Q 2.1 | Page 363

Why is the base of a transistor made thin and is lightly doped?
Exercises | Q 2.2 | Page 364

How is a Zener diode different than an ordinary diode?

Exercises | Q 2.3 | Page 364

On which factors does the wavelength of light emitted by a LED depend?

Exercises | Q 2.4 | Page 364

Why should a photodiode be operated in reverse biased mode?

Exercises | Q 2 (v) (1) | Page 364

State the principle of solar cells.

Exercises | Q 2 (v) (2) | Page 364

State the uses of the solar cell.

Exercises | Q 3 | Page 364

Draw the circuit diagram of a half-wave rectifier. Explain its working. What is the frequency of ripple in its output?

Exercises | Q 4 | Page 364

Why do we need filters in a power supply?

Exercises | Q 5 | Page 364

Draw a neat diagram of a full-wave rectifier and explain it’s working.

Exercises | Q 6 | Page 364

Explain how a Zener diode maintains a constant voltage across a load.

Exercises | Q 7 | Page 364

Explain the forward and the reverse characteristic of a Zener diode.

Exercises | Q 8 | Page 364

Explain the working of a LED.

Exercises | Q 9 | Page 364

Explain the construction and working of the solar cell.

Exercises | Q 10 | Page 364

Explain the principle of operation of a photodiode.

Exercises | Q 2. 11. (1) | Page 364

What is a logic gate?

Exercises | Q 2. 11. (2) | Page 364

What do you mean by a truth table?

Exercises | Q 2. 11. (3) | Page 364

What do you mean by a Boolean expression?

Exercises | Q 2. 12. (1) | Page 364

What is a logic gate?

Exercises | Q 2. 12. (2) | Page 364

Write the truth table and Boolean expression for an AND gate.

Exercises | Q 2. 13. (1) | Page 364

What are the uses of logic gates?

Exercises | Q 2. 13. (2) | Page 364

Why is a NOT gate known as an inverter?

Exercises | Q 2. 14. (i) | Page 364

Write the Boolean expressions for an OR gate.

Exercises | Q 2. 14. (ii) | Page 364

Write the truth table and Boolean expression for an AND gate.

Exercises | Q 2. 14. (iii) | Page 364

Write the Boolean expressions for a NAND gate.

Exercises | Q 15 | Page 364

Why are the emitter, the base, and the collector of a BJT doped differently?

Exercises | Q 16 | Page 364

Which method of biasing is used for operating a transistor as an amplifier?

Exercises | Q 17 | Page 364

Define α and β. Derive the relation between then.

Exercises | Q 18 | Page 364

The common-base DC current gain of a transistor is 0.967. If the emitter current is 10mA. What is the value of base current?

Exercises | Q 19 | Page 364

In a common-base connection, a certain transistor has an emitter current of 10mA and a collector current of 9.8 mA. Calculate the value of the base current.

Exercises | Q 20 | Page 364

In a common-base connection, the emitter current is 6.28mA and the collector current is 6.20 mA. Determine the common-base DC current gain.

Exercises

## Balbharati solutions for Physics 12th Standard HSC Maharashtra State Board chapter 16 - Semiconductor Devices

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Concepts covered in Physics 12th Standard HSC Maharashtra State Board chapter 16 Semiconductor Devices are Semiconductor Devices, p-n Junction Diode as a Rectifier, Special Purpose Junction Diodes, Bipolar Junction Transistor (BJT), Logic Gates.

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