MCQs

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Overall MCQs for Reference

Which of the following is not a type of binary tree traversal?
a. Inorder
b. Preorder
c. Postorder
d. Randomorder
Answer: d. Randomorderexamveda
In an inorder traversal, the nodes are visited in what sequence?
a. Root, Left, Right
b. Left, Root, Right
c. Left, Right, Root
d. Root, Right, Left
Answer: b. Left, Root, Righttestbook+1
Preorder traversal of a binary tree follows which visiting order?
a. Root, Left, Right
b. Left, Right, Root
c. Right, Root, Left
d. Left, Root, Right
Answer: a. Root, Left, Rightinterviewkickstart+1
Which traversal method lists nodes of a binary search tree in ascending order?
a. Preorder
b. Inorder
c. Postorder
d. Level-order
Answer: b. Inordercareerride+1
Postorder traversal of a binary tree visits nodes in which order?
a. Root, Right, Left
b. Left, Root, Right
c. Left, Right, Root
d. Root, Left, Right
Answer: c. Left, Right, Roottestbook+1
Which traversal is commonly used for depth-first evaluation of expression trees?
a. Inorder
b. Preorder
c. Postorder
d. Breadth-first
Answer: c. Postordertestbook+1
Which type of traversal is naturally suitable for copying a binary tree?
a. Inorder
b. Preorder
c. Postorder
d. Level-order
Answer: b. Preordersanfoundry+1
During which traversal is the root node visited between left and right subtrees?
a. Inorder
b. Preorder
c. Postorder
d. Level-order
Answer: a. Inordersanfoundry+1
Level-order traversal of a binary tree refers to:
a. Depth-first
b. Breadth-first
c. Preorder
d. Postorder
Answer: b. Breadth-firstinterviewkickstart
Which traversal can be achieved using a queue data structure?
a. Inorder
b. Preorder
c. Postorder
d. Level-order
Answer: d. Level-orderinterviewkickstart
Which two traversals are not sufficient to construct a unique binary tree?
a. Preorder and Inorder
b. Inorder and Postorder
c. Preorder and Postorder
d. Inorder and Level-order
Answer: c. Preorder and Postordertestbook
The inorder predecessor of a node in a BST is:
a. Largest node in left subtree
b. Smallest node in right subtree
c. Parent node
d. Sibling node
Answer: a. Largest node in left subtreetestbook
The inorder successor of a node in a BST is:
a. Largest node in left subtree
b. Smallest node in right subtree
c. Parent node
d. Sibling node
Answer: b. Smallest node in right subtreetestbook
In which traversal is the last node visited always a leaf?
a. Preorder
b. Inorder
c. Postorder
d. Level-order
Answer: c. Postordersanfoundry
If a BST has values 1, 2, 3, 4, 5, then its inorder traversal yields:
a. 5, 4, 3, 2, 1
b. 1, 2, 3, 4, 5
c. 3, 1, 4, 2, 5
d. 4, 2, 3, 1, 5
Answer: b. 1, 2, 3, 4, 5testbook+1
In preorder traversal, the second step is:
a. Traverse right subtree
b. Traverse left subtree
c. Visit root
d. Traverse both subtrees
Answer: b. Traverse left subtreesanfoundry
Which traversal is used to generate prefix notation of an expression tree?
a. Inorder
b. Preorder
c. Postorder
d. Level-order
Answer: b. Preorderinterviewkickstart+1
Which traversal method does not guarantee visiting nodes in sorted order for BST?
a. Inorder
b. Preorder
c. Both a and b
d. Only b
Answer: b. Preordertestbook
Which application uses binary tree traversal for encoding data efficiently?
a. QuickSort
b. Huffman coding
c. Binary Heap
d. AVL Tree
Answer: b. Huffman codingsanfoundry+1
Which traversal would output A, B, C for a complete binary tree starting from root?
a. Depth-first (DFS)
b. Breadth-first (BFS)
c. Both
d. None
Answer: b. Breadth-first (BFS)testbook
What is the primary data structure for iterative inorder traversal?
a. Queue
b. Stack
c. Array
d. Linked list
Answer: b. Stackinterviewkickstart+1
Recursion is easily replaced with which data structure in binary tree traversals?
a. Queue
b. Stack
c. Heap
d. Array
Answer: b. Stackinterviewkickstart
Which node is visited first in postorder traversal?
a. Root
b. Left child
c. Right child
d. Leaf node
Answer: b. Left childsanfoundry+1
Which traversal produces a sorted sequence from a binary search tree?
a. Postorder
b. Preorder
c. Level-order
d. Inorder
Answer: d. Inordercareerride+1
In binary tree traversal algorithms, which is not a common traversal type?
a. Inorder
b. Outorder
c. Preorder
d. Postorder
Answer: b. Outorderexamveda
Which traversal visits nodes in the order: Root, Left, Right?
a. Preorder
b. Postorder
c. Inorder
d. Level-order
Answer: a. Preordertestbook+1
The queue is fundamental for which traversal method?
a. Inorder
b. Preorder
c. Postorder
d. Level-order
Answer: d. Level-orderinterviewkickstart
What is common to all three node-based traversals (inorder, preorder, postorder)?
a. Root is always visited first
b. Left subtree is visited before right subtree
c. Nodes are always visited level by level
d. Right subtree is visited first
Answer: b. Left subtree is visited before right subtreetestbook
Which of the following is not required to reconstruct a binary tree uniquely?
a. Inorder and Preorder
b. Inorder and Postorder
c. Preorder and Postorder
d. Inorder and Level-order
Answer: c. Preorder and Postordertestbook
Which traversal is used for binary tree serialization?
a. Preorder
b. Postorder
c. Inorder
d. Any of the above
Answer: a. Preordersanfoundry+1
Postorder traversal is particularly used for:
a. Evaluating expressions
b. Topological sorting
c. BFS searching
d. Node deletion
Answer: a. Evaluating expressionssanfoundry+1
What is the typical time complexity of all tree traversal methods?
a. O(log n)
b. O(n^2)
c. O(n)
d. O(1)
Answer: c. O(n)testbook+1
Which of the following can use recursive or iterative implementations?
a. Only Inorder
b. Only Level-order
c. All traversals
d. Only Preorder
Answer: c. All traversalsinterviewkickstart+1
Which traversal is preferable for deleting all nodes in a binary tree?
a. Inorder
b. Preorder
c. Postorder
d. Level-order
Answer: c. Postordersanfoundry+1
The last node visited in level-order traversal is always a:
a. Root
b. Leftmost leaf
c. Rightmost leaf
d. Middle node
Answer: c. Rightmost leafinterviewkickstart+1
In which traversal does the root node act as a separator between left and right subtrees?
a. Inorder
b. Preorder
c. Postorder
d. Level-order
Answer: a. Inordersanfoundry+1
Breadth-first traversal visits a node’s:
a. All ancestors
b. All descendants
c. All immediate children
d. All siblings
Answer: c. All immediate childreninterviewkickstart
The unvisited node with minimum depth is processed next in:
a. Depth-first traversal
b. Breadth-first traversal
c. Preorder traversal
d. Postorder traversal
Answer: b. Breadth-first traversalinterviewkickstart
Which traversal order is best for printing node values as they appear by level?
a. Level-order
b. Inorder
c. Preorder
d. Postorder
Answer: a. Level-orderinterviewkickstart
DFS can be implemented using:
a. Queue
b. Stack
c. Heap
d. Priority queue
Answer: b. Stackinterviewkickstart
Which traversal order can be used to reconstruct an expression if postfix notation is known?
a. Preorder
b. Inorder
c. Level-order
d. Postorder
Answer: d. Postordersanfoundry+1
Which method helps to check if a binary tree is full using traversals?
a. Only Preorder
b. Inorder or Preorder
c. Preorder/Postorder/Level-order/Inorder
d. Only Inorder
Answer: c. Preorder/Postorder/Level-order/Inorderinterviewkickstart
Which ordering does NOT occur in tree traversals?
a. Left, Root, Right
b. Root, Left, Right
c. Left, Right, Root
d. Right, Root, Left
Answer: d. Right, Root, Lefttestbook+1
Which traversal prints a binary heap in sorted order?
a. Preorder
b. Level-order
c. Inorder
d. Postorder
Answer: c. Inordercareerride+1
Traversing only leftmost branches and then ascending back up is characteristic of:
a. Inorder
b. Preorder
c. Postorder
d. Level-order
Answer: a. Inordersanfoundry+1
What is the parent of any node in a binary tree?
a. Always root
b. One level above
c. Always left child
d. Always right child
Answer: b. One level abovetestbook+1
How many traversals would visit every node exactly once?
a. Any standard traversal
b. Inorder only
c. Preorder and Postorder only
d. Level-order only
Answer: a. Any standard traversaltestbook+1
What is the primary use of inorder traversal in BSTs?
a. Search
b. Sorted output
c. Tree height
d. Node count
Answer: b. Sorted outputcareerride+1
If a node has only one child, what happens in every traversal?
a. Child is always ignored
b. Child is always visited
c. Depends on traversal
d. Root is always visited last
Answer: b. Child is always visitedtestbook+1
A complete binary tree is defined as:
a. Tree filled every level
b. Linked list
c. All left subtrees filled only
d. Only root exists
Answer: a. Tree filled every leveltestbook+1

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