🧠 Top 100 NIELIT O Level MCQs 2025 with Answers
Section A: IT Tools and Business Systems
1. Which device is used to process data?
a) Keyboard
b) Monitor
c) CPU ✅
d) Printer
2. What does CPU stand for?
a) Central Process Unit
b) Central Processing Unit ✅
c) Central Peripheral Unit
d) None of these
3. Which of the following is an example of an output device?
a) Keyboard
b) Monitor ✅
c) Scanner
d) Joystick
4. Which memory is non-volatile?
a) RAM
b) ROM ✅
c) Cache
d) Register
5. Which shortcut key is used to copy selected text?
a) Ctrl + X
b) Ctrl + C ✅
c) Ctrl + V
d) Ctrl + P
6. MS Word is a —
a) Operating System
c) Word Processing Software ✅
b) Spreadsheet
d) DBMS
7. Which of the following is not an input device?
a) Mouse
b) Keyboard
c) Scanner
d) Plotter ✅
8. A byte consists of —
a) 4 bits
c) 8 bits ✅
b) 16 bits
d) 32 bits
9. The smallest unit of information is —
a) Nibble
b) Word
c) Bit ✅
d) Byte
10. Which of the following is a storage device?
a) Keyboard
b) Mouse
c) Hard Disk ✅
d) Joystick
11. Which is the brain of the computer?
a) ALU
b) Control Unit
c) CPU ✅
d) Memory
12. Which type of software is MS Excel?
a) Utility software
b) System software
c) Application software ✅
d) Programming software
13. Which of these is used for printing?
a) Scanner
b) Plotter ✅
c) Mouse
d) Monitor
14. Operating system is —
a) Utility software
b) System software ✅
c) Application software
d) None
15. Shortcut key for paste operation is —
a) Ctrl + V ✅
b) Ctrl + C
c) Ctrl + X
d) Ctrl + A
16. Which one is not an operating system?
a) Windows
b) Linux
c) Oracle ✅
d) macOS
17. Which is an example of system software?
a) MS Word
b) Windows ✅
c) Tally
d) Photoshop
18. Which of the following is used for backup?
a) Mouse
b) Pen Drive ✅
c) Keyboard
d) CPU
19. Which key is used to delete a character to the right of the cursor?
a) Backspace
b) Delete ✅
c) Tab
d) Spacebar
20. The process of starting a computer is called —
a) Loading
b) Booting ✅
c) Restarting
d) Uploading
Section B: Internet Technology and Web Design
21. What does URL stand for?
a) Uniform Resource Locator ✅
b) Universal Reference Link
c) Uniform Reference Locator
d) Unified Resource List
22. HTML stands for —
a) Hyper Text Markup Language ✅
b) Hyperlinks Text Making Language
c) High Text Markup Language
d) None
23. Which tag is used for the largest heading in HTML?
a) h1 ✅
b) h2
c) h3
d) h9
24. HTTP stands for —
a) Hyper Text Transmission Protocol
b) High Transfer Text Protocol
c) Hyper Text Transfer Protocol ✅
d) Hyper Table Transfer Path
25. Which protocol is used to send emails?
a) SMTP ✅
b) FTP
c) HTTP
d) SNMP
26. The address bar of a web browser shows the —
a) URL ✅
b) Server name
c) File name
d) IP address
27. Which of the following is not a search engine?
a) Google
b) Yahoo
c) Facebook ✅
d) Bing
28. Which protocol is used for file transfer?
a) FTP ✅
b) HTTP
c) SMTP
d) POP
29. In HTML,
tag is used for —
a) Paragraph
b) Italic text
c) Line break ✅
d) Bold text
30. Which attribute is used to specify a link destination?
a) src
b) link
c) href ✅
d) alt
31. The tag is used to —
a) Insert image ✅
b) Insert video
c) Create form
d) Create table
32. <b> tag is used for —
a) Bold text ✅
b) Italic text
c) Line break
d) Title
33. <i> tag makes text —
a) Italic ✅
b) Bold
c) Underlined
d) Capitalized
34. <p>tag is used for —
a) Picture
b) List
c) Paragraph ✅
d) Header
35. <title> tag is written inside —
a) <body>
b) <html>
c) <p>
d) <head> ✅
36. Which of these is a web browser?
a) Yahoo
b) Chrome ✅
c) Google
d) Hotmail
37. Which of these is used to access websites?
a) Compiler
b) Database
c) Server
d) Browser ✅
38. IP stands for —
a) Internet Program
b) Internal Process
c) Internet Protocol ✅
d) Integrated Packet
39. The top-level domain of India is —
a) .org
b) .uk
c) .us
d) .in ✅
40. Which protocol is used for secure communication?
a) FTP
b) SMTP
c) HTTPS ✅
d) POP
Perfect 👍 — here are Questions 41 to 100 of the NIELIT O Level (Computer Course) MCQs with answers in random positions and a ✅ blue tick after each correct answer.
🧮 Section C: Programming and Problem Solving Through C
41. C language was developed by —
a) Charles Babbage
b) Bill Gates
c) Dennis Ritchie ✅
d) Ken Thompson
42. Which symbol ends a statement in C?
a) :
b) .
c) ; ✅
d) ,
43. The correct syntax of main() is —
a) void main() ✅
b) main(void)
c) int main(void)
d) all of these
44. The printf() function is used for —
a) Input
b) Looping
c) Decision making
d) Output ✅
45. The scanf() function is used for —
a) Output
b) Display
c) Input ✅
d) None
46. /* … */ is used for —
a) Single-line comments
b) Multi-line comments ✅
c) Header inclusion
d) Variable declaration
47. Which of these is not a keyword?
a) int
b) return
c) float
d) printf ✅
48. The operator && represents —
a) Logical OR
b) Bitwise AND
c) Logical AND ✅
d) Relational operator
49. The operator || represents —
a) Logical OR ✅
b) Bitwise OR
c) Conditional OR
d) None
50. % operator is used for —
a) Power
b) Division
c) Modulus ✅
d) Comparison
51. The format specifier for integer is —
a) %f
b) %d ✅
c) %s
d) %c
52. The format specifier for float is —
a) %f ✅
b) %d
c) %i
d) %s
53. Array index in C starts from —
a) 1
b) -1
c) 0 ✅
d) Any
54. A string in C ends with —
a) Space
b) Semicolon
c) Null character ✅
d) Dot
55. The keyword used for decision making is —
a) switch
b) case
c) loop
d) if ✅
56. Switch statement uses —
a) if
b) case ✅
c) goto
d) loop
57. Which operator increases value by 1?
a) ++ ✅
b) —
c) +
d) *
58. Which operator decreases value by 1?
a) — ✅
b) ++
c) –
d) /
59. Loop that executes at least once —
a) while
b) for
c) do-while ✅
d) if
60. A function that calls itself is called —
a) Static
b) Inline
c) Recursive ✅
d) Local
🔐 Section D: ICT Resources and Cyber Security
61. ICT stands for —
a) Internet and Computer Technology
b) Information and Communication Technology ✅
c) Information Code Transfer
d) International Computer Training
62. Example of system software —
a) Operating System ✅
b) MS Excel
c) Tally
d) Photoshop
63. Example of input device —
a) Printer
b) Keyboard ✅
c) Plotter
d) Projector
64. Example of output device —
a) Scanner
b) Monitor ✅
c) Keyboard
d) Mouse
65. LAN stands for —
a) Large Area Network
b) Local Area Network ✅
c) Linked Access Network
d) Logical Access Node
66. WAN stands for —
a) Wireless Area Network
b) Wide Area Network ✅
c) World Area Network
d) Web Access Network
67. A group of computers connected together is called —
a) System
b) Internet
c) Network ✅
d) Server
68. Cybercrime means —
a) Physical theft
b) Computer-related crime ✅
c) Traffic violation
d) None
69. Firewall is used to —
a) Protect network ✅
b) Increase RAM
c) Store data
d) Format drives
70. Virus stands for —
a) Virtual Internet Resource Utility System
b) Vital Information Resources Under Siege ✅
c) Virtual Internal Resource Unit System
d) None
71. Antivirus software —
a) Detects and removes viruses ✅
b) Creates viruses
c) Increases speed
d) Manages storage
72. ISP stands for —
a) Internet Service Provider ✅
b) Internet Support Program
c) Internal Server Page
d) Information Sharing Protocol
73. Which device connects a computer to the Internet?
a) Printer
b) Modem ✅
c) Switch
d) Mouse
74. The unit of data transmission speed is —
a) Hz
b) rpm
c) bps ✅
d) dpi
75. The smallest unit of memory —
a) Bit ✅
b) Byte
c) KB
d) MB
76. 1 KB = —
a) 1000 Bytes
b) 512 Bytes
c) 1024 Bytes ✅
d) 2048 Bytes
77. Which one is an open-source OS?
a) Windows
b) Linux ✅
c) macOS
d) Solaris
78. Which one is volatile memory?
a) Hard disk
b) ROM
c) Cache
d) RAM ✅
79. Which one is non-volatile memory?
a) ROM ✅
b) RAM
c) Cache
d) Register
80. Which device displays information?
a) Keyboard
b) Mouse
c) Scanner
d) Monitor ✅
🗂️ Section E: Database & Office Tools
81. DBMS stands for —
a) Database Management System ✅
b) Data Backup Memory System
c) Digital Base Management System
d) Database Main Storage
82. Which key is primary in a table?
a) Unique identifier ✅
b) Duplicate field
c) Null field
d) None
83. In MS Excel, a formula starts with —
a) = ✅
b) +
c) –
d) *
84. The intersection of a row and column is called —
a) Field
b) Table
c) Cell ✅
d) Record
85. MS PowerPoint is used for —
a) Presentation ✅
b) Database
c) Typing
d) Drawing
86. Shortcut key to save a file —
a) Ctrl + C
b) Ctrl + P
c) Ctrl + S ✅
d) Ctrl + D
87. In Excel, rows are labeled as —
a) Numbers ✅
b) Letters
c) Words
d) None
88. Columns are labeled as —
a) Letters ✅
b) Numbers
c) Words
d) None
89. Chart in Excel is used to —
a) Display data graphically ✅
b) Calculate totals
c) Format cells
d) None
90. Shortcut key to print a document —
a) Ctrl + S
b) Ctrl + P ✅
c) Ctrl + C
d) Ctrl + X
🌐 Section F: Networking and Internet
91. Full form of URL —
a) Uniform Resource Locator ✅
b) Unique Routing Line
c) Universal Reference Locator
d) Uniform Routing List
92. Internet was first developed by —
a) CERN
b) ARPANET ✅
c) Microsoft
d) NASA
93. Which of the following is a domain name extension?
a) @gmail
b) .com ✅
c) www
d) http
94. Which is a web browser?
a) Gmail
b) Mozilla Firefox ✅
c) Yahoo Mail
d) Hotmail
95. Email protocol for receiving mails —
a) POP3 ✅
b) SMTP
c) FTP
d) HTTP
96. Email protocol for sending mails —
a) POP3
b) SMTP ✅
c) IMAP
d) DNS
97. Which software detects and removes malware?
a) Antivirus ✅
b) Compiler
c) Editor
d) Emulator
98. Which port is used for HTTP?
a) 25
b) 110
c) 80 ✅
d) 21
99. Which device connects two networks?
a) Hub
b) Switch
c) Router ✅
d) Modem
100. Which organization developed Internet Protocol (IP)?
a) DARPA ✅
b) NASA
c) IBM
d) Google