Top 100+ Computer GK Questions and Answers
Computer General Knowledge is a high-scoring and frequently tested section in examinations such as SSC, Railway, Banking, Defence, Police, and other government recruitment tests. A strong understanding of computer fundamentals helps candidates answer questions related to hardware, software, memory, operating systems, networking, internet services, cybersecurity, shortcuts, databases, and digital technology. This practice set contains 100+ important Computer GK questions with four options and instant explanations. Try to answer every question yourself before checking the explanation. Regular revision of these questions can improve conceptual clarity, speed, accuracy, and confidence in the Computer Awareness section.
1. CPU stands for:
CPU executes instructions, performs calculations, and coordinates the computer’s processing activities.
2. The brain of a computer is the:
The CPU is called the brain because it processes instructions and controls the computer’s operations.
3. A keyboard is a/an:
A keyboard sends letters, numbers, symbols, and commands to the computer as input.
4. A monitor is a/an:
A monitor displays the computer’s visual output, such as text, images, and video.
5. RAM stands for:
RAM temporarily stores programs and data currently in use; its contents normally disappear when power is removed.
6. Which memory is non-volatile?
ROM retains stored information without power, whereas RAM normally loses its contents when the computer is switched off.
7. ROM stands for:
ROM stores relatively permanent instructions, such as firmware, that remain available after power is removed.
8. Which is an operating system?
An operating system manages hardware resources and provides the environment in which applications run.
9. Windows was developed by:
Microsoft is the correct choice because it specifically matches the computer concept described in the question.
10. Which is an open-source operating system?
An operating system manages hardware resources and provides the environment in which applications run.
11. WWW stands for:
The World Wide Web is a system of linked web resources accessed through the internet using a browser.
12. The World Wide Web was invented by:
Tim Berners-Lee developed the World Wide Web and its foundational technologies at CERN.
13. URL stands for:
A URL identifies the location of a resource, such as a web page or file, on a network.
14. Secure web browsing commonly uses:
HTTPS protects HTTP communication with TLS encryption, helping secure data in transit.
15. HTTP stands for:
HTTP is the protocol through which clients and servers transfer web resources.
16. A device that forwards packets between networks is a:
A router examines destination addressing information and forwards packets toward the correct network.
17. NIC provides:
Network connectivity is the correct choice because it specifically matches the computer concept described in the question.
18. LAN stands for:
A LAN connects devices within a limited area, such as a home, school, or office.
19. WAN stands for:
A WAN connects networks across large geographical areas.
20. A network covering a city is usually called:
A MAN is designed to connect networks across a metropolitan or city-sized area.
21. IP stands for:
IP supplies the addressing and routing rules used to move packets between networks.
22. The protocol that assigns IP addresses automatically is:
DHCP automatically supplies network settings, including an IP address, to a device.
23. DNS is used to:
Translate domain names into IP addresses is the correct choice because it specifically matches the computer concept described in the question.
24. HTML stands for:
HTML structures web-page content using elements and tags.
25. Web-page styling is mainly done with:
CSS controls the appearance and layout of web pages, including fonts, spacing, and colors.
26. Web-page interactivity is commonly added using:
JavaScript responds to user actions and can change web-page content dynamically.
27. USB stands for:
USB is a standard interface for connecting devices and transferring data and, often, power.
28. Which storage device has no moving parts?
An SSD uses flash-memory chips and therefore has no spinning disks or moving read/write heads.
29. HDD stands for:
An HDD stores data magnetically on rotating platters and uses moving read/write heads.
30. Processor speed is commonly measured in:
Hertz measures cycles per second; gigahertz means billions of cycles per second.
31. One byte contains:
A byte is conventionally made up of eight bits.
32. The smallest unit of digital data is a:
A bit is a single binary digit that can have a value of 0 or 1.
33. A traditional binary kilobyte contains:
A byte is conventionally made up of eight bits.
34. Arithmetic and logical operations are performed by the:
The ALU performs arithmetic operations and logical comparisons inside the CPU.
35. ALU stands for:
ALU means Arithmetic Logic Unit, the CPU component responsible for arithmetic and logical operations.
36. The control component of the CPU is the:
The Control Unit directs and coordinates the execution of instructions.
37. Software that manages hardware is called:
System software is the correct choice because it specifically matches the computer concept described in the question.
38. MS Word is an example of:
MS Word is application software because it is designed for creating and editing documents.
39. GUI stands for:
A GUI lets users interact with software through visual elements such as windows, icons, and menus.
40. The common refresh key in Windows browsers is:
F5 commonly reloads or refreshes the current page in Windows browsers.
41. The shortcut for Copy is:
Ctrl + C copies selected content to the clipboard.
42. The shortcut for Paste is:
Ctrl + V inserts content from the clipboard at the current cursor or selection.
43. The shortcut for Undo is:
Ctrl + Z reverses the most recent compatible editing action.
44. The shortcut for Select All is:
Ctrl + A selects all selectable content in the active area.
45. The shortcut for Save is:
Ctrl + S saves changes to the current file.
46. The shortcut for Print is:
Ctrl + P opens the print command in many applications.
47. PDF stands for:
PDF preserves document layout so a file can appear consistently on different devices.
48. A modern Word document usually has the extension:
The .docx extension identifies a modern Microsoft Word document.
49. An Excel workbook usually has the extension:
The .xlsx extension identifies a modern Microsoft Excel workbook.
50. A PowerPoint presentation usually has the extension:
The .pptx extension identifies a modern Microsoft PowerPoint presentation.
51. A computer virus is:
A computer virus is malicious code that can replicate by attaching itself to files or programs.
52. Two-factor authentication improves:
Two-factor authentication adds a second verification method, such as a code, beyond a password.
53. Phishing attempts to steal:
Phishing uses deceptive messages or websites to trick people into revealing sensitive information.
54. Malware means:
Malware is a broad term for harmful software, including viruses, worms, trojans, and spyware.
55. Software used to detect viruses is:
A computer virus is malicious code that can replicate by attaching itself to files or programs.
56. A firewall is used to:
A firewall filters incoming or outgoing network traffic according to security rules.
57. Cloud computing delivers services through:
Cloud computing provides resources such as storage and processing over a network, usually the internet.
58. Google Drive is an example of:
Google Drive stores files on remote servers and permits online access, synchronization, and sharing.
59. AI stands for:
AI involves systems that perform tasks associated with abilities such as learning, reasoning, or pattern recognition.
60. IoT stands for:
IoT refers to physical devices with sensors and connectivity that collect and exchange data.
61. A database is:
A database organizes related information so it can be stored, searched, updated, and retrieved efficiently.
62. DBMS stands for:
A DBMS is software for creating, organizing, querying, updating, and controlling access to databases.
63. The common language for relational databases is:
SQL is used to retrieve and manipulate data in relational databases.
64. SQL stands for:
SQL means Structured Query Language, used to work with relational database data and structures.
65. The key that deletes left of the cursor is:
Backspace normally removes the character immediately to the left of the cursor.
66. The key that usually deletes right of the cursor is:
Delete normally removes the character immediately to the right of the cursor or a selected item.
67. The key that moves to the next form field is:
Tab commonly moves keyboard focus to the next field or control in a form.
68. The key used for continuous uppercase typing is:
Caps Lock toggles continuous uppercase typing for alphabetic characters.
69. A scanner converts paper documents into:
A scanner converts printed text or images into digital data.
70. A printer produces:
A printer converts digital content into physical output, called a hard copy.
71. A microphone is an:
A microphone captures sound and converts it into signals that a computer can process.
72. Speakers are:
Speakers convert audio signals into sound waves.
73. A webcam is used for:
A webcam captures video for calls, recording, and other applications.
74. BIOS stands for:
BIOS is firmware that initializes hardware and starts the boot process on traditional PCs.
75. Booting means:
Booting is the startup process in which the computer initializes and loads the operating system.
76. A backup is:
A backup is a separate copy of data kept for recovery after loss or damage.
77. Compression means:
Compression represents data more efficiently to reduce its storage or transmission size.
78. Which is an image extension?
The .jpg extension commonly identifies a JPEG image file.
79. Which is an audio extension?
The .mp3 extension identifies a compressed digital audio file in MP3 format.
80. Which is a video extension?
The .mp4 extension identifies a multimedia container commonly used for video and audio.
81. An algorithm is:
An algorithm is a finite, ordered sequence of steps for solving a problem or completing a task.
82. A compiler:
A compiler translates source code into another form, such as machine code or an intermediate representation.
83. An interpreter generally processes code:
An interpreter executes or translates program instructions during runtime, often incrementally.
84. Which is a programming language?
Python is a high-level programming language used in automation, web development, and data analysis.
85. E-commerce means:
E-commerce means conducting buying, selling, or related commercial activity through electronic networks.
86. A digital payment is:
A digital payment transfers money electronically through methods such as cards or banking applications.
87. OTP stands for:
An OTP is a temporary code intended for one authentication or transaction attempt.
88. CAPTCHA helps distinguish:
CAPTCHA challenges help distinguish human users from automated programs.
89. Spam email is:
Spam is unwanted or unsolicited email, often sent in bulk.
90. A search engine helps users:
A search engine retrieves or indexes online information and presents results for a query.
91. Mozilla Firefox is a:
Web browser is the correct choice because it specifically matches the computer concept described in the question.
92. Bluetooth is mainly used for:
Bluetooth enables short-range wireless communication between compatible devices.
93. Wi-Fi is a technology for:
Wi-Fi allows devices to connect to a local network wirelessly, usually through an access point.
94. GPS stands for:
GPS uses satellite signals to help determine location, movement, and time.
95. Encryption means:
Encryption converts readable plaintext into coded ciphertext to protect information from unauthorized access.
96. Decryption means:
Decryption converts ciphertext back into readable plaintext using the appropriate key or method.
97. A strong password should generally use:
A strong password is long and unique, making it harder to guess or crack.
98. The first computer generation used:
First-generation computers used vacuum tubes, which made them large and power-hungry.
99. The second computer generation used:
Second-generation computers used transistors, which were smaller and more reliable than vacuum tubes.
100. The third computer generation used:
Third-generation computers used integrated circuits containing multiple electronic components.
Conclusion
Computer GK is best prepared through a combination of concept revision and regular practice. After completing these 100 questions, revise the topics where you made mistakes and maintain a short notebook of important full forms, keyboard shortcuts, networking terms, memory types, file extensions, and cybersecurity concepts. For competitive examinations, do not rely only on memorisation. Understand the practical role of devices, operating systems, protocols, software, and online-security tools. Consistent practice, focused revision, and error analysis will help you strengthen your Computer Awareness preparation.