BSc CSIT 3rd Semester DSA Important Questions | Past Year Questions 

Introduction

If you're a BSc CSIT 3rd semester student, chances are you're juggling multiple subjects— Data Structures and Algorithms (DSA) being one of the most vital. Whether you're aiming to pass or secure distinction, focusing on important questions based on past year trends is a smart move.

This blog post covers:

• Most asked DSA questions in TU exams
• Chapter-wise important concepts
• Common patterns in past papers
• Smart preparation tips for exams

Why Focus on DSA?

DSA isn’t just an academic subject—it’s the foundation for coding interviews, competitive programming, and system design. TU exams often repeat question patterns, so understanding key topics and previous year trends can boost your confidence and performance.

Unit-Wise Important Questions (Based on Past Papers)

Unit 1: Introduction to Data Structures

• Define ADT. Explain different types of data structures.
• Differentiate between static and dynamic memory allocation.
• What is recursion? Give examples.

Unit 2: Arrays and Linked Lists

• Write an algorithm for insertion and deletion in a singly linked list.
• Compare arrays and linked lists.
• Convert a singly linked list into a circular linked list.

Unit 3: Stacks and Queues

• Implement stack using array or linked list.
• Infix to postfix conversion (frequently asked!)
• Applications of stack and queue.
• Circular queue vs linear queue.

Unit 4: Trees

• Differentiate between binary tree and binary search tree.
• Write an algorithm for preorder traversal.
• Create a binary search tree from a given set of nodes.
• Expression trees and their evaluation.

Unit 5: Graphs

• Represent a graph using adjacency matrix and list.
• Explain BFS and DFS with examples.
• Applications of graphs.

Unit 6: Searching and Sorting

• Explain binary search with algorithm and complexity.
• Write and explain the quick sort algorithm.
• Compare bubble sort, insertion sort, and selection sort.
• Time complexities of sorting algorithms.

Repeated Questions (5-Year Trend)

These questions have appeared 2 or more times in the last 5 years:

• Infix to postfix conversion using stack
• Binary search algorithm and its complexity
• Difference between queue and circular queue
• Preorder, Inorder, and Postorder traversal
• BFS and DFS algorithms with examples
• Constructing BST from a list of nodes
• Quick sort (with example)

Tips to Prepare for DSA TU Exams

1. Understand concepts, don’t just memorize algorithms.
2. Draw diagrams for tree and graph problems.
3. Practice writing pseudocode.
4. Focus on algorithm complexity – always asked in theory.
5. Solve at least 3 past year papers before the exam.

Final Words

DSA can seem daunting, but with the right focus and strategy, you can score well. Use this guide as a reference while preparing and make sure to practice coding these structures to truly master them.

Bonus Tip:

Start solving problems on popular coding platforms:
LeetCode, GeeksforGeeks, or HackerRank.