Which traversal method visits the root node before its subtrees?
Difficulty: Medium
About this MCQ
This Medium Data Structures MCQ checks one syllabus fact.
The question is: “Which traversal method visits the root node before its subtrees?”
The accepted answer is B. Preorder. Preorder is the person, body, or term that satisfies “Which traversal method visits the root node before its subtrees” (option B). Option A (“Inorder”) does not match the stem; it is a near-miss used to catch incomplete recall of Preorder. Option C (“Postorder”) does not match the stem; it is a near-miss used to catch incomplete recall of Preorder. Remaining alternatives (Level Order) fall outside the same rule and should be eliminated once Preorder is identified. Data Structures questions of this type reward precise definitions rather than approximate associations. Data Structures recall of this distinction is a regular item in FPSC, PPSC, NTS, and CSS papers.
- A. Inorder
Why not A: “Inorder” is not correct. The accepted answer is B. Preorder. Preorder is the person, body, or term that satisfies “Which traversal method visits the root node before its subtrees” (option B). Option A (“Inorder”) does not match the stem; it
- B. Preorder ✓
- C. Postorder
Why not C: “Postorder” is not correct. The accepted answer is B. Preorder. Preorder is the person, body, or term that satisfies “Which traversal method visits the root node before its subtrees” (option B). Option A (“Inorder”) does not match the stem; it
- D. Level Order
Why not D: “Level Order” is not correct. The accepted answer is B. Preorder. Preorder is the person, body, or term that satisfies “Which traversal method visits the root node before its subtrees” (option B). Option A (“Inorder”) does not match the stem; it
Correct answer
B. Preorder
Explanation
Preorder is the person, body, or term that satisfies “Which traversal method visits the root node before its subtrees” (option B). Option A (“Inorder”) does not match the stem; it is a near-miss used to catch incomplete recall of Preorder. Option C (“Postorder”) does not match the stem; it is a near-miss used to catch incomplete recall of Preorder. Remaining alternatives (Level Order) fall outside the same rule and should be eliminated once Preorder is identified. Data Structures questions of this type reward precise definitions rather than approximate associations. Data Structures recall of this distinction is a regular item in FPSC, PPSC, NTS, and CSS papers.
Source: Data Structures Reference Guide
Tags: data structures, trees, preorder
Submitted by: MCQsHub Editorial
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