Answer Key + Explanations
Delhi Police Exam
This comprehensive answer key with detailed explanations helps you understand the reasoning behind each correct answer. Use this for self-assessment and concept reinforcement after attempting mock tests.
Answer Key with Short Explanations
CPU → Central Processing Unit
Explanation: Known as the "brain" of the computer, it executes instructions.
Mainframe → Used for large-scale computations
Explanation: Mainframes are powerful, high-capacity computers for enterprises.
Second Generation → Transistors used
Explanation: Transistors replaced vacuum tubes, making computers faster and smaller.
OCR → Optical Character Recognition
Explanation: Converts handwritten or printed text into digital form.
Printer → Output device
Explanation: Produces a hard copy of digital data.
RAM → Volatile memory
Explanation: Temporary storage; data is lost when power is off.
AVERAGE → Excel function
Explanation: Calculates the mean of selected numeric cells.
Insert Tab → Page numbers in Word
Explanation: The Insert tab is used to add objects, headers, footers, and page numbers.
Ctrl + B → Bold text in Word
Explanation: Shortcut key to apply bold formatting.
Worm → Malware
Explanation: Self-replicating program that spreads over networks.
HTTPS → Secure data transmission
Explanation: Encrypts communication between browser and server.
Windows → Multitasking OS
Explanation: Allows multiple programs to run simultaneously.
Conditional Formatting → Excel
Explanation: Highlights cells based on specified criteria.
SSD → Storage device
Explanation: Solid State Drive used for permanent storage of data.
Firewall → Protects network
Explanation: Monitors and controls incoming/outgoing network traffic.
DNS → Converts domain names to IP
Explanation: Domain Name System translates human-readable names to machine-readable IPs.
VxWorks → Real-time OS
Explanation: RTOS used in embedded systems and mission-critical devices.
MICR → Input device for banking
Explanation: Magnetic Ink Character Recognition reads cheque details.
COUNTIF → Excel function
Explanation: Counts cells that meet a specified condition.
Pie Chart → Percentage distribution
Explanation: Graphical representation of parts-to-whole relationships.
PDF → Portable Document Format
Explanation: File format that preserves document layout across devices.
Ctrl + Z → Undo action
Explanation: Shortcut key to revert the last action.
Android → Mobile OS
Explanation: Operating system designed for smartphones and tablets.
RAM → Volatile memory
Explanation: Temporary storage that loses content when power is off.
HTTPS → Secure web browsing
Explanation: Ensures encrypted communication over the internet.
Keyboard → Input device
Explanation: Used to enter text and commands into a computer.
Speaker → Output device
Explanation: Converts digital signals into audible sound.
ROM → Permanent storage
Explanation: Stores essential instructions; data not lost when power is off.
Trojan → Type of malware
Explanation: Appears as legitimate software but performs malicious actions.
Firewall → Network protection
Explanation: Prevents unauthorized access to or from a private network.
Excel SUM Function → Adds numbers
Explanation: Adds numbers in selected cells.
Excel AVERAGE Function → Computes mean
Explanation: Computes mean of a range.
COUNTIF Function → Counts conditionally
Explanation: Counts cells meeting condition.
Conditional Formatting → Highlights cells
Explanation: Highlights cells based on criteria.
Pie Chart → Percentage form
Explanation: Shows data in percentage form.
Line Chart → Trends over time
Explanation: Shows trends over time.
Bar Chart → Compares categories
Explanation: Compares values of different categories.
Ctrl + C → Copy data
Explanation: Copy selected data.
Ctrl + V → Paste data
Explanation: Paste copied data.
Ctrl + X → Cut data
Explanation: Cut selected data.
MICR → Reads bank cheques
Explanation: Reads bank cheques.
OCR → Converts printed text
Explanation: Converts printed text to digital.
HDD → Hard Disk Drive
Explanation: Hard Disk Drive, storage device.
SSD → Solid State Drive
Explanation: Solid State Drive, storage device.
USB → Universal Serial Bus
Explanation: Universal Serial Bus, external storage or device interface.
LAN → Local Area Network
Explanation: Local Area Network.
WAN → Wide Area Network
Explanation: Wide Area Network.
HTTP → HyperText Transfer Protocol
Explanation: HyperText Transfer Protocol.
HTML → HyperText Markup Language
Explanation: HyperText Markup Language, for creating web pages.
HTTPS → Secure HTTP
Explanation: Secure version of HTTP.
Quick Reference Tables
Excel Functions
Keyboard Shortcuts
Essential Acronyms
Hardware
Networking
Web & Security
Quick Exam Tricks & Recap
Key Focus Areas:
- Memorize common acronyms (CPU, RAM, ROM, BIOS, LAN, WAN)
- Understand difference between input/output devices
- Practice Excel formulas & functions (SUM, AVERAGE, IF, COUNTIF)
- Remember Word shortcuts: Ctrl+C, Ctrl+V, Ctrl+B
Exam Strategy:
- Cybersecurity basics: Firewalls, antivirus, secure browsing
- OS types & generations: Batch, multitasking, real-time
- Charts & Graphs in Excel: Bar, Pie, Line
- Focus on short, exam-level definitions
Pro Tip: Delhi Police exams often test the same concepts repeatedly. Master these key areas for high scores.
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