Practice Questions
Delhi Police Exam
Short Notes Summary - All Topics Covered
1. What is a Computer?
- A machine that processes data into information
- Characteristics: Speed, Accuracy, Automation, Storage, Connectivity
- Components: Input, Processing (CPU), Output, Storage
2. Hardware vs Software
- Hardware: Physical components (CPU, RAM, Keyboard, Monitor)
- Software: Programs that run on hardware (System Software / Application Software)
3. Input, Processing, Output, Storage (IPO) Cycle
- Input: Devices to enter data (Keyboard, Mouse)
- Processing: CPU executes instructions
- Output: Devices to display results (Monitor, Printer)
- Storage: Save data (HDD, SSD, Pen Drive)
4. Types of Computers
- Micro: Personal computers
- Mini: Small business computers
- Mainframe: Large-scale, high-performance computing
- Supercomputer: Extremely high-speed computation
5. Generation of Computers
- 1st Gen: Vacuum tubes
- 2nd Gen: Transistors
- 3rd Gen: Integrated Circuits (ICs)
- 4th Gen: Microprocessors
- 5th Gen: Artificial Intelligence / Advanced computing
6. Common Computer Terminology
- Bit = 0 or 1
- Byte = 8 bits
- KB = 1024 Bytes
- MB = 1024 KB
- GB = 1024 MB
- TB = 1024 GB
7. Peripheral Devices
- Input Devices: Keyboard, Mouse, Scanner
- Output Devices: Monitor, Printer, Speaker
- Storage Devices: HDD, SSD, Pen Drive
- Some devices are both Input/Output (e.g., Modem)
Practice Questions
An IP version 4 address is ______ long.
Options: (a) 16 bits (b) 32 bits (c) 64 bits (d) 128 bits
Year: 2022 | Shift: 1
View Answer
32 bits
What is the keyboard shortcut to perform "paste" operation in MS-Word?
Options: (a) Ctrl + X (b) Ctrl + C (c) Ctrl + V (d) Ctrl + Z
Year: 2020 | Shift: 1
View Answer
Ctrl + V
Every computer connected to the internet must have an:
Options: (a) MAC address (b) IP address (c) Domain name (d) Hostname
Year: 2020 | Shift: 1
View Answer
IP address
Which of the following is an input device?
Options: (a) Monitor (b) Keyboard (c) Printer (d) Speaker
Year: 2021 | Shift: 1
View Answer
Keyboard
Which of the following protocols is used to transfer files from one node to another over the internet?
Options: (a) HTTP (b) FTP (c) SMTP (d) POP3
Year: 2020 | Shift: 1
View Answer
FTP
1024 Byte is equal to ______.
Options: (a) 1000 Bytes (b) 512 Bytes (c) 1 KB (d) 2 KB
Year: 2020 | Shift: 1
View Answer
1 KB
Which of the following is called the 'brain' of the computer?
Options: (a) RAM (b) CPU (c) ALU (d) ROM
Year: 2021 | Shift: 1
View Answer
CPU
Vacuum tubes were used in which generation of computers?
Options: (a) First generation (b) Second generation (c) Third generation (d) Fourth generation
Year: 2021 | Shift: 1
View Answer
First generation
Which device is used to convert printed text into a digital image?
Options: (a) Printer (b) Scanner (c) Monitor (d) Keyboard
Year: 2021 | Shift: 1
View Answer
Scanner
Which of the following is an output device?
Options: (a) Mouse (b) Keyboard (c) Speaker (d) Joystick
Year: 2021 | Shift: 1
View Answer
Speaker
1 GB is equal to how many MB (in binary multiples)?
Options: (a) 1000 MB (b) 1024 MB (c) 512 MB (d) 2048 MB
Year: 2021 | Shift: 1
View Answer
1024 MB
Which of the following best describes MS-Word software?
Options: (a) Operating System (b) Utility Software (c) Word Processor (d) Programming Language
Year: 2021 | Shift: 1
View Answer
Word Processor
Quick Revision Cards
Data Measurement
1 Byte = 8 Bits
1 KB = 1024 Bytes
1 MB = 1024 KB
Computer Types
Micro - Personal
Mini - Business
Mainframe - Large Scale
Generations
1st - Vacuum Tubes
2nd - Transistors
3rd - ICs
Peripherals
Input: Keyboard, Mouse
Output: Monitor, Printer
Storage: HDD, Pen Drive
Shortcuts
Copy: Ctrl + C
Paste: Ctrl + V
Cut: Ctrl + X
Networking
IP Address - Internet ID
FTP - File Transfer
HTTP - Web Pages
You've completed Computer Knowledge Practice!
Courage Tip: Regular practice with previous year questions is key to success. Revise the quick summary cards before your exam and focus on understanding concepts rather than memorization.
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