Top 40 Data Structure MCQs for Software Engineers to Ace Your Interview

Learning data structures and algorithms is
fundamental for any software developer from any domain. These concepts form the
backbone for most of the profiles in IT. Understanding the data structure MCQs
for software engineers is crucial for these interviews.

With the increase in job opportunities, the
competition has also increased. Now, top-tech companies hire software engineers
who are highly skilled and possess advanced knowledge of data structures and
algorithms.

Mastering data structures such as arrays,
linked lists, stacks, and trees, along with
algorithms for sorting, searching, and traversing, enhances problem-solving
skills and logical thinking.

Practicing
MCQs on data structures and algorithms reinforces knowledge and
problem-solving skills. These MCQs are crucial if you’re on a self-learning
journey. You can assess your knowledge and see where you stand.

These data structure MCQs for software
engineers cover basic operations and data structures, linear and non-linear
data structures, queue operations, algorithm applications, and so on.

Overall, these questions aim to test and
reinforce knowledge in various areas including the types and operations of data
structures, algorithmic applications, and fundamental programming principles
crucial for software developers.

We have brought you a collection of 40 data structure MCQs for software engineers
to strengthen your preparation. These algorithm
interview questions are commonly asked in numerous top-tech FAANG companies’ interview processes.

Also
Read: Top Data
Structures and Algorithms Interview Questions

Data Structures MCQs with Answers

Data
structure MCQs help you understand vast topics
precisely and get yourself prepared enough to crack software engineer interviews in one go.

We have enlisted some coding
interview questions with their answers that are commonly
asked in top tech companies like FAANG+.

1. Choose the Invalid Operation for
the Data Structure.

a.
Operations that manipulate data in
some manner

b.
Operations that evaluate
computation

c.
Operations that track the
occurrence of objects

d.
Operations that assess syntax
error

Answer: The correct answer of this data structure MCQ for software engineers
is ‘a’ – Operations that manipulate data in some manner

2. ______ is the Outcome of the
following Code Snippet.

 SHAPE  * MERGEFORMAT

1. 10
2. 9
3. 4
4. 5

Answer:
b. 9

3. In C, String is Represented in
Memory as:

1. Same as other primitive data
2. The object of any class
3. LinkedList of characters in a database
4. An array of characters

Answer:
d. An array of characters

4. Choose the Correct Linear Data
Structure.

1. Graphs
2. Array
3. Binary Trees
4. AVL Trees

Answer:
The correct answer to this data structure MCQ for
software engineers is ‘b’ – Array

5. From the Type of Queue Given,
Choose the Odd One Out.

1. Single-ended queue
2. Priority queue
3. Circular queue
4. Ordinary queue

Answer: a. Single-ended queue

6. What is the Correct Output for the
Given Code Snippet?

 SHAPE  * MERGEFORMAT

1. Syntax Error
2. 15
3. 2
4. 3

Answer: d. 3

7. ________ Data Structures Used to
Implement Maps in C++.

1. AVL Trees
2. Hash Tables
3. Binary Search Trees
4. Red-Black Trees

Answer: d. Red-Black Trees

8. Which of the Given Applications are
Topological Sorts of a Graph?

1. OD Deadlock Detection
2. Sentence Ordering
3. Course Scheduling
4. All of the above

Answer:
d. All of the above

9. Choose the Correct Data Structure
Used to Match the Parenthesis.

1. n-ary tree
2. Priority queue
3. Ordinary queue
4. Stack

Answer: The correct answer to this data structure MCQ for software engineers
is ‘d’ – Stack

10. ________ Algorithm is Used in the
Top Tree Data Structures.

1. Branch
2. Greedy
3. Divide and Conquer
4. None of the above

Answer: c. Divide and Conquer

11. Choose the Value of the End (Rear)
in Case the Queue is Full.

1. MAX – 1
2. MAX + 1
3. Null (zero)
4. None of the above

Answer:
a. MAX – 1

12. Choose the Correct Value Set at
the Front and Rear Ends Throughout Initializing a Queue.

1. -1
2. 1
3. 0
4. Infinity

Answer: a. -1

13. Which Algorithms are Used for
String and Pattern-Matching Problems?

1. KMP Algorithm
2. Rabin Karp
3. Z Algorithm
4. All of the above

Answer: d. All of the above

14. Name the Condition When a Pop()
Operation is Called on an Empty Queue.

1. Syntax Error
2. Garbage Value
3. Overflow
4. Underflow

Answer: d. Underflow

15. Choose the Application that
Implements a Circular Linked List.

1.  Allocating CPU to resources
2. To perform a functional call
3. Incorporate hash tables
4. All of the above

Answer: The correct answer to this data structure MCQ for software engineers
is ‘a’ – Allocating CPU to resources

16. Choose the Odd One Out of Computer
Languages: Linux, Java, and C++.

1. Linux
2. Java
3. C++
4. None of the above

Answer: a. Linux

17. Which of the Following Comes Under
Linear Data Structure?

1. AVL trees
2. Binary trees
3. Array
4. Graphs

Answer:
c. Array

18. If the Queue is Non-Empty, Choose
the Correct Application Condition from the Following.

1. Rear = front
2. Unpredictable
3. Rear > front
4. Rear < front

Answer: c. Rear > front

19. Choose the Main Purpose of OOP
Inheritance.

1. Prevent data abstraction
2. Prevent data deletion
3. Define exceptions
4. Establish a parent-child relationship between classes

Answer: d. Establish a parent-child relationship between classes

20. _________ Principle Ensures that
Only the Necessary Information is Visible to the Outside World.

1. Polymorphism
2. Abstraction
3. Information hiding
4. Encapsulation

Answer: The correct answer to this data structure MCQ for software engineers
is ‘c’ – Information hiding

21. Which Sorting Algorithms Offer the
Best Time Complexity Over the Worst-Case Scenario?

1. Bubble sort
2. Selection sort
3. Merge sort
4. None of the above

Answer: c. Merge sort

22. Choose From the Following Which is
not a Type of Queue.

1. Circular queue
2. Single-ended queue
3. Ordinary queue
4. None of the above

Answer: b. Single-ended queue

22. Which of the Following is Needed
to Evaluate Whether an Expression Comprises a Balanced Parenthesis?

1. Array
2. Stack
3. Queue
4. All of the above

Answer: b. Stack

23. The Emptiness of a Queue can be
Precisely Verified by Which of the Following ‘C’ Functions?

1. 1.  

int empty(Q*P)

{

if (P->R==-1)

return (1);

return (0);

}

2. 2.  

int full(Q*P)

{

if (P<-R==MAX-1)

return (1);

return (0);

}

3. 3.  

int empty(Q*P)

{

if (P<-R>==-1)

return (0);

return (1);

}

4. 4.  

int full (Q*P)

{

if (P<-R==-1)

return (1);

return (0);

}

Answer: The correct answer to this data structure MCQ for software engineers
is ‘a’ - 

int empty(Q*P)

{

if (P->R==-1)

return (1);

return (0);

}

24. The ‘If’ Statements can have
Multiple ________.

1. IF ELSE
2. CASE
3. ELSE
4. ELSEIF

Answer: d. ELSEIF

25. The Root Directory of a Disk is
Placed at:

1. Fixed address in the primary memory
2. Anywhere on the disk
3. Fixed place on the system disk
4. Depending on the disk type

Answer: c. Fixed place on the system disk

26. Within a Switch Statement, Which
of the Following You can Use?

1. Break but not continue
2. Both continue and break
3. Continue but not break
4. Neither continue nor break

Answer: a. Break but not continue

27. _______ Function is Used to Append
the Character at the Back of a String in C++ Programming Language.

1. push()
2. append()
3. push_back()
4. insert()

Answer:
The correct answer to this data structure MCQ for
software engineers is ‘c’ – push_back()

28. Determine the Correct Output for
the Given Postfix Expression: 6324+___*?

1. –12
2. 18
3. –18
4. 12

Answer:
c. –18

29. When There is a Need for Quicker
Append and Pop Operations for Both Ends of the Container, the Data Structure
used in Python over a list is ______.

1. Stack
2. Queue
3. Dequeue
4. a or b

Answer: c. Dequeue

30. Choose the Correct Operation
Performed by the Pops Function on the ‘stackname’ Stack Using the Given Code.

def pops(stackname)

return len(stackname)

1. Return the size of the stack
2. Pop element from the stack
3. Push the element on the bottom of the stack
4. None of the above

Answer: a. Return the size of the stack

31. Stack is the Optimal Data Structure
Implemented to Solve:

1. Tree
2. Heap
3. Stack
4. Priority

Answer:
c. Stack

32. If a*b is Written as *ab, We call
it ________:

1. Polish notation
2. Inflix expression
3. Postfix expression
4. Polish expression

Answer: The correct answer to this data structure MCQ for software engineers
is ‘a’ – Polish notation

33. __________ Add an Element to the
Top of a Stack.

1. Pop
2. Push
3. IsEmpty
4. Peek

Answer: b. Push

34. Choose the Correct Output of the
Given Snippet.

 SHAPE  * MERGEFORMAT

1. 3
2. 6
3. 1, 2, 3
4. 3, 2, 1

Answer: The correct answer to this data structure MCQ for software engineers
is ‘d’ – 3, 2, 1

35. ______ is the Data Structure Used
to Complement Recursion.

1. Queue
2. List
3. Array
4. Stack

Answer: d. Stack

36. A _________ Notation is Implemented
for Writing an Expression Where _______ Operators are Written in Between the
Operands.

1. Infix, binary
2. Infix, tertiary
3. Postfix, infix
4. Prefix, postfix

Answer: a. Infix, binary

37. _______ and ________ are the two
Fundamentals Implemented on the Stack.

1. PUSH & POP
2. TOP & HEAD
3. BACK & FRONT
4. ENQUEUE & DEQUEUE

Answer: The correct answer to this data structure MCQ for software engineers
is ‘a’ – PUSH & POP

38. Elements ‘6’, ‘9’, ‘1’, and ‘5’
are Placed in a Queue and then Deleted One by One at a Time. Choose the Correct
Order of their Removal.

1. 6915
2. 5196
3. 6915
4. 9615

Answer: c. 6915

39. Calculate the Outcome of the
Following Postfix Expression: 793+4/*.

1. 21
2. 10
3. 33
4. 49

Answer: a. 21

40. ________ Data Structures can be
Used to Implement Queues.

1. LinkedList
2. Stack
3. Arrays
4. All of the above

Answer: The correct answer to this data structure MCQ for software engineers
is ‘d’ – All of the above

Learn Data Structures and Crack Tough
Interviews with IK!

Mastering data structures and algorithms
(DSA) is crucial as it forms the backbone of many job profiles in software
development, data analysis, and more. Our Early
Engineering Course is designed to give you a strong foundation
in DSA, equipping you with the skills needed to excel in technical interviews
and on the job.

Our instructors teach you data structures
and algorithms from sorting algorithms, recursion, Trees, Graphs,
and more. These concepts are fundamental to other major job profiles as well.
For instance, back-end engineering.

Aspiring Data Scientists also learn data
structures and algorithms from our data science course.

FAQs: Crucial Data Structure MCQs for
Software Engineers

Q1.
What is Data Structure Suitable For?

Data structure is best for data retrieval,
storage, processing, and organization.

Q2.
Why Create a Data Structure?

Data structure enables users to easily
access and perform work within the data based on their requirements.

Q3.
Who is the Father of Data Structure and Algorithm?

Donald Knuth from Stanford University is
known as the father of data structure and algorithms.

Q4.
What is an Algorithm in Data Structure?

An algorithm refers to a procedure or list
of instructions to conduct particular actions, solve problems, or perform a
computation.

Q5.
What is a Flowchart in Data Structure?

A flowchart refers to a structure or diagram
that determines a process, computer algorithm, or system. It is used to
represent complex data in simpler form for a better understanding of the
concept.

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