Practice Section
Delhi Police Exam
Introduction to Computer Working Principle
This practice section is Delhi Police-ready, combining diagram-based questions and MCQs to strengthen your understanding of the working principle of a computer.
Exam Insight: Diagram-based questions are very common in Delhi Police exams. Focus on data flow, CPU components, and memory types.
1. Diagram-Based Questions
Draw a simple block diagram showing the flow of data in a computer
Hint: Include Input → CPU (ALU + Control Unit) → Output → Storage
View Answer
├─ ALU (Arithmetic & Logic Unit)
└─ Control Unit
→ Output Device → Storage → User
Label the components in the following diagram:
Imagine a simple diagram with CPU, RAM, Input/Output devices, Storage
View Answer
- CPU → Central Processing Unit
- ALU → Arithmetic Logic Unit inside CPU
- Control Unit → inside CPU
- RAM → Temporary Storage
- Input Devices → Keyboard, Mouse, Scanner
- Output Devices → Monitor, Printer
- Storage → HDD/SSD
Identify which unit temporarily holds data during processing
View Answer
RAM (Random Access Memory)
In the block diagram, where does arithmetic and logical operation occur?
View Answer
ALU (Arithmetic Logic Unit)
Indicate the flow of data from a user entering input on a keyboard to the output on a monitor
View Answer
Keyboard → Input Unit → CPU (ALU + Control Unit) → Output Unit (Monitor)
2. MCQs (Delhi Police PYQ-style)
Which unit of a computer is called the brain?
Options: (a) RAM (b) CPU (c) HDD (d) Keyboard
View Answer
CPU
Temporary memory used during processing is called:
Options: (a) SSD (b) RAM (c) ROM (d) Printer
View Answer
RAM
Which CPU component performs arithmetic and logic operations?
Options: (a) Control Unit (b) ALU (c) Monitor (d) RAM
View Answer
ALU
Permanent storage devices include:
Options: (a) RAM (b) SSD/HDD (c) Keyboard (d) Mouse
View Answer
SSD/HDD
Control Unit is responsible for:
Options: (a) Processing calculations (b) Controlling all operations of the computer (c) Temporary storage (d) Displaying output
View Answer
Controlling all operations of the computer
Which of the following is an input device?
Options: (a) Printer (b) Mouse (c) Monitor (d) Speaker
View Answer
Mouse
Which of the following is an output device?
Options: (a) Keyboard (b) Scanner (c) Speaker (d) Mouse
View Answer
Speaker
Data flow in a computer is:
Options: (a) Output → CPU → Input → Storage (b) Input → CPU → Output → Storage (c) CPU → RAM → Input → Output (d) RAM → CPU → Monitor → Input
View Answer
Input → CPU → Output → Storage
ALU and Control Unit together form:
Options: (a) Input Unit (b) Output Unit (c) CPU (d) Storage Unit
View Answer
CPU
Which of the following devices converts user commands into digital data?
Options: (a) Input Device (b) Output Device (c) Storage Device (d) Monitor
View Answer
Input Device
Quick Recap & Memory Tricks
Data Flow: Input → CPU → Output → Storage
CPU Components: ALU + Control Unit
ALU Function: Arithmetic & Logic operations
Control Unit: Controls all computer operations
Memory Types: RAM → Temporary, HDD/SSD → Permanent
Memory Trick: "Input enters, CPU processes, Output shows, Storage keeps"
Exam Tip: MCQs are usually one-liners derived from the diagram itself. Practice drawing the basic computer block diagram multiple times.
Practice Assignment
Task: Create a Computer Block Diagram
Draw and label the complete computer working principle diagram with all components.
Take a blank sheet of paper or open MS Word/PowerPoint
Draw the complete computer block diagram showing:
- Input Devices
- CPU (with ALU and Control Unit)
- Output Devices
- Storage Devices
- Data flow arrows
Label all components clearly
Write a brief description of data flow
Pro Tip: Practice drawing this diagram from memory multiple times. This will help you answer diagram-based questions quickly in the exam.
You've completed Computer Working Principle Practice!
Courage Tip: Understanding the basic working principle of a computer is fundamental to computer awareness. Remember the key data flow: Input → Process → Output → Storage. The CPU acts as the brain with ALU handling calculations and Control Unit managing operations. Regular practice of drawing the block diagram will make you confident in tackling diagram-based questions in Delhi Police exams.
Master Computer Fundamentals for Delhi Police Exam!
Join Courage Library for comprehensive study materials and expert guidance.
Be a Couragian!