ITI (Trade-COPA) Day-4

ITI COPA (Computer Operator & Programming Assistant) – Basic Notes

Topic -Types and working of fire extinguishers. & Introduction to Computer components

1. Introduction to Fire Extinguishers

A fire extinguisher is a safety device used to control or extinguish small fires in emergency situations. It is very important in computer labs, offices, and workshops.

Fire extinguishers work by:

• Cooling the fire

• Cutting off oxygen supply

• Removing fuel

• Breaking the chemical reaction of fire

---

2. Classes of Fire

• Class A: Fires involving solid materials like paper, wood, cloth

• Class B: Fires involving flammable liquids like petrol, oil, paint

• Class C: Fires involving flammable gases

• Class D: Fires involving combustible metals

• Class E: Fires involving electrical equipment

---

3. Types of Fire Extinguishers and Their Working

1. Water Type Fire Extinguisher

• Used for: Class A fires

• Working: Cools the burning material below ignition temperature

• Not used for electrical or oil fires

2. Foam Type Fire Extinguisher

• Used for: Class A and B fires

• Working: Forms a foam layer over fire, cuts off oxygen supply

3. Dry Powder Fire Extinguisher

• Used for: Class B, C and electrical fires

• Working: Powder forms a barrier between fuel and oxygen

4. Carbon Dioxide (CO₂) Fire Extinguisher

• Used for: Electrical and Class B fires

• Working: Displaces oxygen and cools the fire

• Leaves no residue, safe for computers

5. Wet Chemical Fire Extinguisher

• Used for: Cooking oil and fat fires

• Working: Forms a soapy layer and cools the fire

---

4. General Safety Rules While Using Fire Extinguishers

• Read instructions before use

• Keep extinguisher upright

• Aim at the base of the fire

• Do not use water on electrical fires

• Maintain safe distance

---

Topic 2: Introduction to Computer Components

---

Introduction

A computer is an electronic device that accepts data, processes it, and produces output. A computer system consists of hardware and software components.

---

 Main Components of Computer

1. Input Devices

Used to enter data into the computer.

• Keyboard

• Mouse

• Scanner

• Microphone

2. Central Processing Unit (CPU)

The CPU is the brain of the computer. It performs all processing and calculations.

Main parts of CPU:

• ALU (Arithmetic Logic Unit) – performs arithmetic and logical operations

• CU (Control Unit) – controls all operations

3. Memory Unit

Stores data and instructions.

• Primary Memory: RAM, ROM

• Secondary Memory: Hard disk, Pen drive, CD/DVD

4. Output Devices

Used to display results.

• Monitor

• Printer

• Speaker

• Projector

 Importance of Computer Components

• Helps in efficient data processing

• Essential for office and industrial work

• Improves speed and accuracy

• Used in education, business, and communication

---

Multiple Choice Questions (MCQs) – CBT Exam Practice

1. Which fire extinguisher is best for electrical fires? a) Water type
   b) Foam type
   c) CO₂ type
   d) Wet chemical

2. Class A fire involves: a) Electrical equipment
   b) Flammable liquids
   c) Solid materials
   d) Gases

3. Which extinguisher leaves no residue and is safe for computers? a) Water
   b) Foam
   c) Dry powder
   d) CO₂

4. Which component is called the brain of computer? a) Monitor
   b) Keyboard
   c) CPU
   d) Printer

5. ALU is a part of: a) Input device
   b) Output device
   c) CPU
   d) Memory

6. Which fire extinguisher should NOT be used on electrical fire? a) CO₂
   b) Dry powder
   c) Water
   d) Foam

7. Which device is an input device? a) Monitor
   b) Printer
   c) Speaker
   d) Keyboard

8. RAM is an example of: a) Secondary memory
   b) Primary memory
   c) Output device
   d) Input device

9. Foam extinguisher works by: a) Increasing heat
   b) Cutting oxygen supply
   c) Producing water
   d) Creating sparks

10. Which device is used to store data permanently? a) RAM
    b) Cache
    c) Hard disk
    d) Register

---

Answer Key

1. c

2. c

3. d

4. c

5. c

6. c

7. d

8. b

9. b

10. c