CS & IT Interview Questions for Entry-Level Jobs (2026 Updated)
Very useful for freshers, competitive exams, interviews, SSC, Banking, Railway, State exams, and IT basics.
✅ Basic Computer Science / IT Questions & Answers (Table)
|
No. |
Question |
Answer |
|---|---|---|
|
1 |
What is a computer? |
An electronic device that processes data into information |
|
2 |
What is hardware? |
Physical components of a computer |
|
3 |
What is software? |
Programs and instructions for a computer |
|
4 |
What is an operating system? |
Software that manages hardware and software |
|
5 |
Example of OS |
Windows, Linux, macOS |
|
6 |
What is a CPU? |
Central Processing Unit |
|
7 |
Parts of the CPU |
ALU, Control Unit, Registers |
|
8 |
What is RAM? |
Volatile memory is used for temporary data |
|
9 |
What is ROM? |
Non-volatile memory stores permanent data |
|
10 |
Difference between RAM & ROM |
RAM is temporary, ROM is permanent |
|
11 |
What is an input device? |
Device used to input data |
|
12 |
Example of an input device |
Keyboard, Mouse |
|
13 |
What is an output device? |
A device that shows results |
|
14 |
Example of an output device |
Monitor, Printer |
|
15 |
What is a storage device? |
Device to store data |
|
16 |
Primary memory |
RAM and ROM |
|
17 |
Secondary memory |
HDD, SSD, Pen drive |
|
18 |
What is a motherboard? |
The main circuit board of a computer |
|
19 |
What is ALU? |
Performs arithmetic and logic operations |
|
20 |
What is data? |
Raw facts |
|
21 |
What is information? |
Processed data |
|
22 |
What is binary system? |
Number system with base 2 |
|
23 |
Binary digits |
0 and 1 |
|
24 |
What is bit? |
Smallest unit of data |
|
25 |
What is byte? |
8 bits |
|
26 |
What is KB? |
1024 bytes |
|
27 |
What is MB? |
1024 KB |
|
28 |
What is GB? |
1024 MB |
|
29 |
What is TB? |
1024 GB |
|
30 |
What is software license? |
Legal permission to use software |
|
31 |
System software |
Software that runs system |
|
32 |
Application software |
Software for user tasks |
|
33 |
Example of application software |
MS Word |
|
34 |
What is utility software? |
Software for system maintenance |
|
35 |
What is a compiler? |
Converts high-level code to machine code |
|
36 |
What is an interpreter? |
Converts code line by line |
|
37 |
What is an assembler? |
Converts assembly language |
|
38 |
What is a programming language? |
Language to write programs |
|
39 |
Example of a programming language |
C, Java, Python |
|
40 |
What is an algorithm? |
Step-by-step solution |
|
41 |
What is a flowchart? |
Diagram of program logic |
|
42 |
What is debugging? |
Removing errors |
|
43 |
What is a bug? |
Error in the program |
|
44 |
What is the Internet? |
Global network of computers |
|
45 |
What is WWW? |
Collection of web pages |
|
46 |
What is a browser? |
Software to access websites |
|
47 |
Example of a browser |
Chrome, Firefox |
|
48 |
What is a URL? |
Address of a website |
|
49 |
What is email? |
Electronic mail |
|
50 |
What is an IP address? |
Unique address of the device |
|
51 |
IPv4 size |
32-bit |
|
52 |
IPv6 size |
128-bit |
|
53 |
What is LAN? |
Local Area Network |
|
54 |
What is WAN? |
Wide Area Network |
|
55 |
What is MAN? |
Metropolitan Area Network |
|
56 |
What is a modem? |
Converts digital to analog |
|
57 |
What is a router? |
Connects networks |
|
58 |
What is a firewall? |
Network security system |
|
59 |
What is a virus? |
Harmful computer program |
|
60 |
What is an antivirus? |
Software to remove viruses |
|
61 |
What is malware? |
Malicious software |
|
62 |
What is phishing? |
Online fraud |
|
63 |
What is cloud computing? |
Internet-based computing |
|
64 |
Example of cloud |
Google Drive |
|
65 |
What is a database? |
Organized data collection |
|
66 |
What is DBMS? |
Database Management System |
|
67 |
Example of DBMS |
MySQL |
|
68 |
What is SQL? |
Language to manage databases |
|
69 |
What is a table? |
Rows and columns |
|
70 |
What is a primary key? |
Unique identifier |
|
71 |
What is backup? |
Copy of data |
|
72 |
What is restore? |
Recover backed-up data |
|
73 |
What is a GUI? |
Graphical User Interface |
|
74 |
What is CLI? |
Command Line Interface |
|
75 |
What is open-source software? |
Free source code software |
|
76 |
Example of open-source |
Linux |
|
77 |
What is proprietary software? |
Paid software |
|
78 |
Example of proprietary |
MS Windows |
|
79 |
What is multitasking? |
Running multiple tasks |
|
80 |
What is multiprocessing? |
Multiple CPUs |
|
81 |
What is booting? |
Starting computer |
|
82 |
Cold boot |
Power on start |
|
83 |
Warm boot |
Restart |
|
84 |
What is cache memory? |
High-speed memory |
|
85 |
What is virtual memory? |
Uses HDD as RAM |
|
86 |
What is a PDF? |
Portable Document Format |
|
87 |
What is a spreadsheet? |
Data in rows & columns |
|
88 |
Example of a spreadsheet |
MS Excel |
|
89 |
What is presentation software? |
Slide creation |
|
90 |
Example of presentation software |
PowerPoint |
|
91 |
What is IoT? |
Internet of Things |
|
92 |
What is AI? |
Artificial Intelligence |
|
93 |
What is machine learning? |
Learning from data |
|
94 |
What is encryption? |
Data security method |
|
95 |
What is decryption? |
Convert encrypted data |
|
96 |
What is CAPTCHA? |
Human verification |
|
97 |
What is Bluetooth? |
Short-range wireless tech |
|
98 |
What is Wi-Fi? |
Wireless networking |
|
99 |
What is HTML? |
Web page markup language |
|
100 |
What is CSS? |
Web page styling |
|
101 |
What is JavaScript? |
Web scripting language |
|
102 |
What is e-commerce? |
Online buying & selling |
|
103 |
What is a digital payment? |
Online transaction |
|
104 |
What is OTP? |
One-Time Password |
|
105 |
What is BIOS? |
Basic Input Output System |
Below is a carefully selected set of Interview-Focused CS / IT Questions with Short, Crisp Answers, exactly the kind freshers + entry-level candidates are asked in IT, software, support, and technical interviews.CS & IT Interview Questions for Entry-Level Jobs (2026 Updated)
✅ Interview-Focused Computer Science Questions (with Answers)
|
No. |
Interview Question |
Smart Answer |
|---|---|---|
|
1 |
What is a computer? |
A machine that takes input, processes it, and produces output |
|
2 |
What is the role of an operating system? |
It manages hardware and provides a platform for applications |
|
3 |
What is the difference between hardware and software? |
Hardware is physical; software is logical |
|
4 |
What is RAM? |
Temporary memory used during program execution |
|
5 |
Why is RAM volatile? |
Data is lost when the power is off |
|
6 |
What is ROM? |
Permanent memory storing startup instructions |
|
7 |
What happens when you power on a computer? |
The booting process starts, and the OS loads |
|
8 |
What is booting? |
Process of starting a computer |
|
9 |
Cold boot vs warm boot? |
Cold boot = power on, Warm boot = restart |
|
10 |
What is CPU? |
Brain of the computer |
|
11 |
Parts of the CPU? |
ALU, Control Unit, Registers |
|
12 |
What is ALU? |
Performs arithmetic and logical operations |
|
13 |
What is cache memory? |
High-speed memory between CPU and RAM |
|
14 |
What is data? |
Raw facts |
|
15 |
What is information? |
Processed, meaningful data |
|
16 |
What is software? |
A set of instructions |
|
17 |
Types of software? |
System software and Application software |
|
18 |
Example of system software? |
Windows, Linux |
|
19 |
Example of application software? |
MS Word, Excel |
|
20 |
What is a programming language? |
Language used to write programs |
|
21 |
Difference between a compiler and an interpreter? |
The compiler converts the whole code, interpreter line by line |
|
22 |
What is an algorithm? |
Step-by-step solution to a problem |
|
23 |
What is a flowchart? |
Diagrammatic representation of logic |
|
24 |
What is debugging? |
Finding and fixing errors |
|
25 |
What is a bug? |
Error in a program |
|
26 |
What is a database? |
An organized collection of data |
|
27 |
What is DBMS? |
Software to manage databases |
|
28 |
Example of DBMS? |
MySQL |
|
29 |
What is SQL? |
Language to manage databases |
|
30 |
What is a primary key? |
Uniquely identifies a record |
|
31 |
What is a network? |
Connected computers sharing resources |
|
32 |
What is LAN? |
Network within a small area |
|
33 |
What is WAN? |
Network covering a large area |
|
34 |
What is IP address? |
Unique address of a device |
|
35 |
IPv4 vs IPv6? |
IPv4 is 32-bit, IPv6 is 128-bit |
|
36 |
What is the Internet? |
Global network of computers |
|
37 |
What is WWW? |
Collection of web pages |
|
38 |
What is a browser? |
Software to access websites |
|
39 |
Example of a browser? |
Chrome |
|
40 |
What is a URL? |
Web address |
|
41 |
What is email? |
Electronic mail |
|
42 |
What is cloud computing? |
Using services over the internet |
|
43 |
Example of a cloud service? |
Google Drive |
|
44 |
What is malware? |
Malicious software |
|
45 |
What is a virus? |
A program that damages systems |
|
46 |
What is an antivirus? |
Software to detect and remove viruses |
|
47 |
What is a firewall? |
Network security system |
|
48 |
What is phishing? |
Online fraud to steal information |
|
49 |
What is backup? |
Copy of data for safety |
|
50 |
What is restore? |
Recovering backed-up data |
|
51 |
What is a GUI? |
Graphical interface with icons |
|
52 |
What is CLI? |
Command-based interface |
|
53 |
What is open-source software? |
Free software with source code |
|
54 |
Example of open-source? |
Linux |
|
55 |
What is proprietary software? |
Paid software |
|
56 |
What is multitasking? |
Running multiple programs |
|
57 |
What is virtual memory? |
Using a disk as RAM |
|
58 |
What is IoT? |
Internet-connected smart devices |
|
59 |
What is AI? |
Machines simulating human intelligence |
|
60 |
What is machine learning? |
Systems learning from data |
