This set of MCQ questions on tree and graph includes the collection of multiple-choice questions on the fundamentals of tree and graph. It includes MCQ questions on in-order traversal and post-order traversal of the binary tree, complete binary tree, pre-order, in-order, and post-order traversal in the tree and graph in the data structure.

1) The post-order traversal of the binary tree is DEBFCA. Find out the pre-order traversal.

A. ABFCDE

B. ADBFEC

C. ABDECF

D. ABDCEF

2) While converting the binary tree into an extended binary tree, all the original nodes in the binary tree are …….

A. Internal nodes on extended tree

B. External nodes on extended tree

C. Vanished on extended tree

D. Intermediate nodes on extended tree

3) The in-order traversal of the tree will yield a sorted listing of elements of tree in ……..

A. binary trees

B. binary search trees

C. heaps

D. binary heaps

4) In a binary tree, certain null entries are replaced by special pointers which point to nodes higher in the tree for efficiency. These special pointers are called ………

A. Leaf

B. Branch

C. Path

D. Thread

5) In a head tree …..

A. values in a node are greater than every value in the left subtree and smaller than the right subtree.

B. values in a node are greater than every value in children of it.

C. conditions.

D. terms.

6) The in-order traversal of the tree will yield a sorted listing of elements of tree in…

A. Binary trees

B. Binary search trees

C. Merging

D. AVL Trees

7) In a graph if e=(u,v) means …….

A. u is adjacent to v but v is not adjacent to u.

B. e begins at u and ends at v

C. u is node and v is an edge.

D. both u and v are edges.

8) A binary tree whose every node has either zero or two children is called ………

A. Complete binary tree

B. Binary Search tree

C. Extended binary tree

D. E2 tree

9) If every node u in G is adjacent to every other node v in G, A graph is said to be ……..

A. isolated

B. complete

C. finite

D. strongly connected.

10) The post order traversal of a binary tree is DEBFCA. Find out the pre-order Traversal.

A. ABFCDE

B. ADBFEC

C. ABDECF

D. ABDCEF

**Read Also: Solved MCQ on Tree and Graph in Data Structure**

11) In a graph, if e=[u,v], then u and v are called

A. endpoints of e

B. adjacent nodes

C. neighbors

D. all of the above

12) In-order traversing a tree resulted in E A C K F H D B G; the pre-order traversal would return.

A. FAEKCDBHG

B. FAEKCDHGB

C. EAFKHDCBG

D. FEAKDCHBG

13) A connected graph T without any cycles is called.

A. a tree graph

B. free tree

C. a tree

D. All of the above

14) In the linked representation of Binary trees LEFT[k] contains the …….. of at the node N, where k is the location.

A. Data

B. Location and left child

C. Right child address

D. Null value

15) If every node u in G adjacent to every other node v in G, A graph is said to be

A. isolated

B. complete

C. finite

D. strongly connected

16) Three standards ways of traversing a binary tree T with root R …….

A. Prefix, infix, postfix

B. Pre-process, in-process, post-process

C. Pre-traversal, in-traversal, post-traversal

D. Pre-order, in-order, post-order

17) A graph is said to be ……. if every node u in G is adjacent to every other node v in G.

A. Absolute

B. Entire

C. Inclusive

D. Complete

18) In threaded binary tree ……… points to higher nodes in the tree.

A. Info

B. Root

C. Threads

D. Child

19) A graph is said to be ……. if its edges are assigned data.

A. Tagged

B. Marked

C. Lebeled

D. Sticked

20) If node N is a terminal node in a binary tree then its ………

A. Right tree is empty

B. Left tree is empty

C. Both left & right subtrees are empty

D. The root node is empty

**Answers:**

1) C. ABDECF

2) A. Internal nodes on extended tree

3) B. binary search trees

4) D. Thread

5) B. values in a node is greater than every value in children of it.

6) B. Binary search trees

7) B. e begins at u and ends at v

8) C. Extended binary tree

9) B. complete

10) C. ABDECF

11) D. All of the above

12) B. FAEKCDHGB

13) D. All of the above

14) A. Data

15) B. complete

16) D. Pre-order, in-order, post-order

17) D. Complete

18) C. Threads

19) C. Lebeled

20) C. Both left & right subtrees are empty

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