Chapter 64: DSA Quiz
DSA Quiz is not the name of any single official test, book or platform.
When Indian students (or people preparing for placements, off-campus drives, internships, GATE, or competitive programming) say
“Bhai DSA quiz kar lete hain?” “DSA quiz complete kiya?” “Kal DSA quiz hai company ke liye” “Striver DSA quiz sheet solve kar raha hoon”
they almost always mean one (or a combination) of these things:
- Topic-wise or mixed short-question quizzes on Data Structures & Algorithms (usually MCQ / short-answer style)
- Online coding platforms’ daily/weekly DSA quizzes (LeetCode, GeeksforGeeks, CodeStudio, etc.)
- Company-specific DSA quiz rounds (some companies still conduct MCQ rounds before or along with coding rounds)
- Popular curated “DSA Quiz sheets” made by influencers/teachers (especially Striver’s, Love Babbar style sheets, Fraz, Arsh Goyal etc.)
Let me explain each type in detail with realistic examples so you know exactly what people are talking about in 2025–2026.
1. Topic-wise / Mixed DSA Quizzes (most common meaning)
These are short 10–30 question MCQ / fill-in-the-blank / true-false quizzes that test conceptual understanding.
Typical topics covered in one quiz:
- Arrays & Hashing
- Two Pointers / Sliding Window
- Binary Search (including binary search on answer)
- Linked List (cycle, reverse, middle, etc.)
- Stack & Queue (valid parentheses, monotonic stack, etc.)
- Binary Tree (traversals, height, diameter, LCA, etc.)
- BST properties & operations
- Heap / Priority Queue
- Graph basics (BFS vs DFS, cycle detection)
- Greedy intuition
- Basic DP states (fibonacci-style, knapsack-style)
Realistic example questions you see in these quizzes:
Q1. What is the time complexity of inserting an element at the beginning of a singly linked list? A) O(1) B) O(n) C) O(log n) D) O(n²) Ans: A
Q2. In which traversal of a Binary Search Tree do we get the nodes in sorted order? A) Pre-order B) In-order C) Post-order D) Level-order Ans: B
Q3. Which of these sorting algorithms is stable? A) Quick Sort B) Merge Sort C) Heap Sort D) Selection Sort Ans: B
Q4. In the worst case, what is the time complexity of Quick Sort if we always choose the first element as pivot? A) O(n log n) B) O(n²) C) O(n) D) O(log n) Ans: B
Q5. What data structure is used to implement LRU Cache efficiently? A) Stack + Queue B) HashMap + Doubly Linked List C) Min-Heap D) Array only Ans: B
Where do students practice these?
- Striver’s A2Z DSA Sheet → has concept quizzes
- GeeksforGeeks → Topic-wise MCQ sections
- Love Babbar’s 450 sheet → many people make quiz videos around it
- Take U Forward (Striver) YouTube → concept + quiz videos
- CodeStudio, Scaler Academy, Newton School → built-in quizzes
- LeetCode Explore cards → sometimes have quiz-style questions
2. Company-specific DSA Quiz Rounds (still exist in 2025–26)
Some companies (especially service-based, mid-tier product companies, and some startups) still conduct MCQ rounds before or along with coding rounds.
Typical pattern:
- 20–30 questions
- 20–45 minutes
- Topics: Arrays, Strings, Linked List, Stack/Queue, Tree/BST, Graph basics, Sorting, Searching, Bit Manipulation, Time Complexity, OOP basics
Real example questions from recent company quizzes (2024–2025)
Q. What is the time complexity of accessing an element by index in a dynamic array (like vector in C++)? A) O(1) B) O(n) C) O(log n) D) O(n²) Ans: A
Q. Which of the following is NOT a stable sorting algorithm? A) Merge Sort B) Insertion Sort C) Bubble Sort D) Quick Sort Ans: D
Q. In a singly linked list, to delete a node when only pointer to that node is given (no head pointer), what is the time complexity? A) O(1) B) O(n) C) O(log n) D) Impossible Ans: A (copy next node’s data and delete next)
Q. What is the space complexity of recursive in-order traversal of a binary tree? A) O(1) B) O(log n) average C) O(n) worst D) O(n²) Ans: B & C (depends on tree height)
Companies that still have/had DSA MCQ quizzes recently:
- TCS Digital, Infosys, Accenture, Cognizant (sometimes)
- Deloitte, Capgemini, Wipro (varies by role)
- Mid-tier product companies (Zoho, Freshworks, HashedIn, CRED, Dream11, etc.)
- Some startups before OA/coding round
3. Popular “DSA Quiz Sheets” made by influencers
Many students refer to these as “DSA Quiz”:
- Striver’s A2Z DSA Sheet → has concept + quiz-style questions after each topic
- Love Babbar 450 DSA Cracker → people make MCQ quizzes from this sheet
- Arsh Goyal 280–300 questions → lots of YouTube quiz videos around this
- Fraz / Striver SDE Sheet → very high frequency interview questions → many quiz sessions
- GeeksforGeeks SDE Sheet / Topic-wise quizzes
4. Quick Summary – What “DSA Quiz” means in practice (2025–26)
Most common meanings (in order of frequency):
- Topic-wise or mixed conceptual MCQ quizzes (Striver, GfG, Love Babbar style)
- Company pre-coding MCQ rounds (still exist in many service/mid-tier companies)
- Daily/weekly quizzes on LeetCode, CodeStudio, Scaler, etc.
- YouTube live quiz sessions around famous sheets
Time required to become comfortable (serious student):
- 2–4 weeks → basic concepts + 100–150 MCQs
- 1.5–3 months → very good conceptual clarity + 300–400 MCQs + 150–200 coding problems
Do you want me to:
- Give you a ready list of 50–70 very high-frequency DSA MCQ topics/questions ?
- Explain how to prepare for company DSA MCQ rounds in 2025–26?
- Show you sample 20-question mixed DSA quiz with answers & explanations?
- Recommend best places to practice DSA quizzes right now (free + paid)?
Just tell me which one you want — I’ll give it in the same detailed, teacher-style way 😊
