# Chapter 14 – Semiconductor Electronic: Material, Devices And Simple Circuits Questions and Answers: NCERT Solutions for Class 12 Physics

Class 12 Physics NCERT book solutions for Chapter 14 - Semiconductor Electronic: Material, Devices And Simple Circuits Questions and Answers.

## 5.1. OR Gate: OR gate can be considered as an electronic equipment that is combining AA and BB for providing YY as output. Two inputs are AA and BB and output is YY in this figure. In Boolean algebra OR is shown as ++ .

### Truth Table: This can be defined as a table which is providing an output state for all possible input combinations. Logic operations of OR gate has been provided in its truth table for all possible input combinations.

 Input Output A B Y 0 0 0 0 1 1 1 0 1 1 1 1

## 5.2. AND Gate:

### Truth Table

 Input Output A B Y 0 0 0 0 1 0 1 0 0 1 1 1

## 5.3. NOT Gate:

### Boolean expression for NOT gate is Y=A¯¯¯¯Y=A¯ . Truth Table:

 Input Output A Y 0 1 1 0

## 5.4. NOR Gate:

### Truth Table:

 A B Y′Y′ Y 0 0 0 1 0 1 1 0 1 0 1 0 1 1 1 0

### Truth Table:

 Input Output A B Y 0 0 1 0 1 0 1 0 0 1 1 0

## 5.5. NAND Gate:

### A NAND gate will be having two or more inputs and only one output. A NAND gate is actually a NOT–AND gate. When a NOT gate has been connected at the output of a AND gate, we will be getting NAND gate as represented in the diagram and its truth table has been shown in table.

 A B Y′Y′ Y 0 0 0 1 0 1 0 1 1 0 0 1 1 1 1 0

### Truth Table:

 Input Output A B Y 0 0 1 0 1 1 1 0 1 1 1 0