**Data Structure Multiple Choice Questions and Answer| 30 Basic of Array ****Multiple Choice Questions PDF**

**Data Structure MCQ : **In this section, we have to discuss about 30 Basic data structure/basic of array objective type questions and answers/ Array multiple choice questions/Data structure MCQ questions pdf download/Data structure MCQ question and answer/ Data structures and algorithm MCQ questions/ Data structure mcqs for placement questions are given below. We are using data structures in our everyday life. The data structure is a key component of Computer Science subject and is largely used in the areas of Artificial Intelligence, operating systems, graphics, etc. Data structure provides the right way to organize information in the digital space. Most of the IT sector ask the interview questions about array data structure. That’s why we have given Data structure mcqs for placement. Candidate use this below questions to start and develop your career growth.

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**Data structure MCQ online test with answers -Highlights**

Name of the Article |
Data Structure |

Number of Questions |
30 |

Category |
MCQ Type |

Regularly practice these kind of mcq quiz it will definitely improve your knowledge, skills, reading ability etc. Learning data structures concept is essential even if your are just trying to get better at your current job. Practice in MCQ questions on Data Structure may improve your performance in the Exams and Interview. Time Management for answering the Data Structure/Array multiple choice questions quickly is most important for success in Competitive Exams and Placement Interviews. People also check this Business Communication MCQ questions and answer.

**Read the given below Array multiple choice questions and answers/PDF Format.**

**1. Which one of the following is the process of inserting an element in the stack?**

- Insert
- Push
- Add
- None of the above

**Answer: Push**

**2. Which one of the following is not the application of the stack data structure?**

- Asynchronous data transfer
- String reversal
- Backtracking
- Recursion

**Answer: Asynchronous data transfer**

**3. Which of the following is the prefix form of A+B*C?**

- +A*BC
- ABC+*
- +AB*C
- A+(BC*)

**Answer: +A*BC**

**4. Which data structure is required to convert the infix to prefix notation?**

- Queue
- stacks
- Linked list
- Binary tree

**Answer: stacks**

**5. Which of the following highly uses the concept of an array?**

- Binary Search tree
- Caching
- Spatial locality
- Scheduling of Processes

**Answer: Spatial locality**

**6. Which of the following is the infix expression?**

- ABC+*
- A+B*C
- +A*BC
- None of the above

**Answer: A+B*C**

**7. Which data structure is mainly used for implementing the recursive algorithm?**

- Stack
- Queue
- Linked list
- Binary tree

**Answer: Stack**

**8. What is the outcome of the prefix expression +, -, *, 3, 2, /, 8, 4, 1?**

- 12
- 5
- 11
- 4

**Answer**: **5**

**9. Which one of the following node is considered the top of the stack if the stack is implemented using the linked list?**

- Second Node
- First Node
- Last Node
- None of the above

**Answer: First Node**

**10. A list of elements in which enqueue operation takes place from one end, and dequeue operation takes place from one end is_________**

- Queue
- Stack
- Binary Tree
- Linked List

**Answer: Queue**

**11. The necessary condition to be checked before deletion from the Queue is_________**

- Underflow
- Front value
- Overflow
- Rear value

**Answer: Underflow**

**12. Which one of the following is not the application of the Queue data structure?**

- Data is transferred asynchronously
- Resource shared between various systems
- Balancing of symbols
- Load balancing

**Answer**: ** Balancing of symbols**

**13. What is the maximum number of children that a node can have in a binary tree?**

- 4
- 1
- 3
- 2

**Answer: 2**

**14. Which one of the following techniques is not used in the Binary tree?**

- Preorder traversal
- Randomized traversal
- Inorder traversal
- Postorder traversal

**Answer: Randomized traversal**

**15. How many Queues are required to implement a Stack?**

- 3
- 2
- 1
- 4

**Answer: 2**

**16. A linear data structure in which insertion and deletion operations can be performed from both the ends is_______**

- Circular Queue
- Deque
- Queue
- Priority Queue

**Answer: Deque**

**17. How can we describe an array in the best possible way?**

- Arrays are immutable
- Container that stores the elements of similar types
- The Array is not a data structure
- The Array shows a hierarchical structure

**Answer: Container that stores the elements of similar types**

**18. What is another name for the circular queue among the following options?**

- Rectangle buffer
- Square buffer
- Ring Buffer
- None of the above

**Answer: Ring Buffer**

**19. Which of the following that determines the need for the Circular Queue?**

- Follow the LIFO Principles
- Access the Queue using priority
- Avoid wastage of memory
- Follows the FIFO principle

**Answer: Avoid wastage of memory**

**20. Which of the following principle does Queue use?**

- FIFO Principles
- LIFIO Principles
- Ordered Array
- Linear Tree

**Answer: FIFO Principles**

**21. Which data structure is the best for implementing a priority queue?**

- AStack
- Linked list
- Array
- binary Heap

**Answer: binary Heap**

**22. Which of the following data structures finds its use in recursion?**

- Stack
- Linked list
- Array
- Queue

**Answer: Stack**

**23. Which of the following satisfies the property of the Red Black tree?**

- Black, if the new node is a root node
- Red, if the new node is not a root node
- Black, if the new node is not a root node
- Both A and B

**Answer: Both A and B**

**24. In the Deque implementation using singly linked list, what would be the time complexity of deleting an element from the rear end?**

- O(n
^{2}) - O(1)
- O(nlogn)
- O(n)

**Answer: O(n)**

**25. Which one of the following is the overflow condition if linear queue is implemented using an array with a size MAX_SIZE?**

- rear=MAX_SIZE -1
- rear = MAX_SIZE
- rear = front+1
- rear = front

**Answer: rear=MAX_SIZE -1**

**26. Which of the following is a Divide and Conquer algorithm?**

- Merge Sort
- Heap Sort
- Selection Sort
- Bubble Short

**Answer: Merge Sort**

**27. Which of the following principle is used if two elements in the priority queue have the same priority?**

- Linear Tree
- FIFO
- LIFO
- None of the above

**Answer: FIFO**

**28. The time complexity of enqueue operation in Queue is ______**

- O(n)
- O(1)
- O(nlogn)
- O(logn)

**Answer: O(1)**

**29. Which one of the following is not the type of the Queue?**

- Linear Queue
- Single ended Queue
- Circular Queue
- Double ended Queue

**Answer: Single ended Queue**

**30. If the elements ‘1’, ‘2’, ‘3’ and ‘4’ are added in a stack, so what would be the order for the removal?**

- 4321
- 1234
- 2314
- None of the above

**Answer**:** 4321**

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