Tree traversal methods (in-order, pre-order, post-order) MCQs

By: Prof. Dr. Fazal Rehman | Last updated: May 15, 2025

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1. : What is the main purpose of tree traversal?





2. : Which traversal method visits the left subtree, the root, and then the right subtree?





3. : In which traversal method is the root node visited first?





4. : What is the order of nodes visited in post-order traversal?





5. : Which of the following is true about in-order traversal of a binary search tree?





6. : How does pre-order traversal help in creating a copy of a tree?





7. : Which traversal method is typically used for evaluating expression trees?





8. : What is the result of in-order traversal on the tree with nodes 1, 2, 3, where 2 is the root?





9. : In a binary tree, which traversal method can be used to print the nodes in reverse?





10. : What does the term “depth-first traversal” refer to?





11. : Which traversal method uses a stack implicitly due to recursion?





12. : What is the output of a pre-order traversal on a tree with root A, left child B, and right child C?





13. : Which traversal method is best for printing a tree structure in a human-readable format?





14. : How are in-order and post-order traversals different?





15. : What is the primary characteristic of level-order traversal?





16. : In which traversal method is the left child visited before the right child?





17. : What would be the output of a post-order traversal for a tree structured as follows: A with left child B and right child C?





18. : Which traversal method is least likely to be used in applications that require sorted output?





19. : Which traversal method can lead to a full listing of all nodes without regard for order?





20. : What is the time complexity of tree traversals (in-order, pre-order, post-order)?





21. : Which traversal would you use to get a prefix expression from an expression tree?





22. : What is the output of an in-order traversal on a binary search tree containing the values 3, 1, 4, 2?





23. : What is the primary use of post-order traversal in binary trees?





24. : What is the primary advantage of using a stack in tree traversal?





25. : Which traversal method requires the use of a queue?





26. : What is the order of nodes visited in pre-order traversal?





27. : How does post-order traversal affect memory usage?





28. : What traversal method is typically best for creating a balanced tree?





29. : What is the main difference between depth-first and breadth-first traversal?





30. : Which traversal method is suitable for constructing a binary tree from its traversal sequences?





31. : What is the final output of a post-order traversal on a binary tree with nodes A, B, C?





32. : Which traversal method is most intuitive for hierarchical data representation?





33. : In the context of binary trees, what does the term “leaf node” refer to?





34. : Which traversal method would you use to create a postfix expression?





35. : How do you recognize the root node during traversal?





36. : What is the significance of using recursion in tree traversals?





   

Data Structures MCQs

Basic Concepts
  1. Introduction to Data Structures
  2. Complexity Analysis MCQs
Linear Data Structures MCQs
  1. Arrays MCQs
  2. Linked Lists MCQs
  3. Stacks MCQs
  4. Queues MCQs
Non-Linear Data Structures MCQs
  1. Trees MCQs
  2. Heaps MCQs
  3. Graphs MCQs
Hashing MCQs MCQs
  1. Hash Tables
Sorting and Searching Algorithms MCQs 
  1. Sorting Algorithms MCQs
  2. Searching Algorithms MCQs
Miscellaneous
  1. Memory Management in data structures MCQs
  2. String Manipulation Algorithms MCQs
  1. Data Structures MCQs 1
  2. Data Structures MCQs 2
  3. Data Structures MCQs 3
  4. Data Structures MCQs 4
  5. Data Structures MCQs 5
  6. Stacks Solved MCQs
  7. Queues MCQs
  8. pointer mcqs
  9. Array MCQs
 

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