Q1PYQ · 2023-S2 Q11 · 2025-B Q33
The hexadecimal number F4 is equivalent to which binary number?
- (A) 11111001
- (B) 11110100
- (C) 11111100
- (D) 11111010
Answer: (B) 11110100. F = 1111, 4 = 0100.
Bihar STET Computer Science Previous Year Questions with Answers (2019–2025)
756 real questions from the Bihar STET Computer Science papers of 2019, 2020, 2023, 2024 and 2025, sorted unit by unit. Each PYQ shows the paper and question number, the correct option and an explanation. Where the official key was wrong, the corrected answer is given with the reason.
| Unit / section | PYQs | |
|---|---|---|
| Unit 1 · Digital Logic | 33 (2023, 2024, 2025) | Open |
| Unit 2 · Computer Organization & Architecture | 27 (2023, 2024, 2025) | Open |
| Unit 3 · Programming & Data Structures | 29 (2025) | Open |
| Unit 4 · Algorithms | 27 (2023, 2025) | Open |
| Unit 5 · Operating System | 27 (2023, 2025) | Open |
| Unit 6 · Database Management System | 43 (2023, 2024, 2025) | Open |
| Unit 7 · Computer Network | 48 (2019, 2025) | Open |
| Unit 8 · Software Engineering | 25 (2023, 2025) | Open |
| Unit 9 · Object Oriented Programming | 33 (2023, 2025) | Open |
| Unit 10 · Web-Based Application Development | 68 (2023, 2024, 2025) | Open |
| Unit 11 · Theory of Computation | 31 (2023, 2025) | Open |
| Unit 12 · Internet of Things | 27 (2023, 2025) | Open |
| Unit 13 · Artificial Intelligence | 28 (2023, 2025) | Open |
| Unit 14 · Fundamentals of E-Commerce | 39 (2023, 2024, 2025) | Open |
| Unit 15 · Multimedia | 28 (2023, 2025) | Open |
| Section B · Art of Teaching | 138 (2023, 2025) | Open |
| Section C · Other Skills (GK, Reasoning, Maths) | 105 (2023, 2025) | Open |
Sample PYQs with answers
Q2PYQ · 2023-S1 Q12 · 2025-A Q83
How is the width of the data bus typically measured in a microcomputer system?
- (A) In kilobytes (KB)
- (B) In megahertz (MHz)
- (C) In bits
- (D) In address lines
Answer: (C) In bits. Data-bus width = number of bits transferred at once (8, 16, 32, 64).
Q3PYQ · 2025 · 7 Nov S1
What is the time complexity of the Floyd–Warshall algorithm for a graph with n vertices?
- (A) O(n³)
- (B) O(n log n)
- (C) O(n²)
- (D) O(2ⁿ)
Answer: (A) O(n³). Three nested loops over all vertices. It solves the all-pairs shortest path problem using Dynamic Programming.
Q4PYQ · 2023-S1 Q17 · 2025-B Q36
If an algorithm's behaviour is bounded by o(f(n)) if g(n), what notation does it become when the condition is removed?
- (A) o(f(n))
- (B) o(g(n))
- (C) o(f(n) + g(n))
- (D) o(f(n) × g(n))
Answer: (A) o(f(n)). Under the smoothness rule the bound itself is unchanged; only the condition is dropped.
Q5PYQ · 2025 · 7 Nov S1
The term 'multi-user' in an OS context refers to:
- (A) An OS that can execute multiple programs simultaneously
- (B) An OS that supports multiple users working on the same machine
- (C) An OS that can only run on multiple computers
- (D) An OS with a graphical user interface
Answer: (B) An OS that supports multiple users working on the same machine. Multi-user OS = many users share one machine at the same time.
Q6PYQ · 2023-S1 Q34 · 2025-A Q76
What is DBMS?
- (A) A collection of queries
- (B) A high-level language
- (C) A programming language
- (D) Software that stores, modifies and retrieves data
Answer: (D) Software that stores, modifies and retrieves data. A DBMS is system software that creates, stores, modifies and retrieves data in a database.
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