Data Structure Multiple Choice Questions and Answers pdf

Data Structure Multiple Choice Questions and Answers pdf

Data structures and algorithms multiple choice questions with answers pdf. Data structures MCQs. Multiple choice questions and answers on data structure in Pdf are a great way to test your understanding of the data structures and algorithms.

By exploring various types of questions, you can gain a better insight into the complexities of these topics. You can further hone your skills in this area with practice and dedication.

Algorithms and Data Structure MCQ questions and answers pdf also provide a valuable resource for those who wish to get ahead in their studies or use it as a reference for their work.

Data Structure Multiple Choice Questions

What is Data Structure?

The data structure is an essential concept in computer science. It organizes and storing data efficiently to facilitate easy access and modification.

Any program is built upon the fundamental building blocks of data structures, making it necessary for those studying computer science to have a basic understanding of them to be successful in their studies and future career.

Data structures such as linked list, an array or graph can take different forms. The advantages and disadvantages of each data structure type vary depending on its intended purpose.

For example, an array may be better suited for sorting items in ascending order, while a linked list would be more suitable for inserting new elements at any point in the sequence.

Understanding how each type works will help you decide which one should be used when designing a program or algorithm.

Data Structure Multiple Choice Questions and Answers

1. The ‘C’ language is developed by —-
A) Ken Martin
B) Thomson
C) Charles Babbage
D) Dennis Ritchie
Answer: (D) Explanation: Dennis Ritchie is the creator of the C programming language.

2. There is the —- number of keywords in the ‘C’ language.
A) 30
B) 32
C) 31
D) 35
Answer: (B) Explanation: The C language has 32 keywords that are reserved for specific purposes and cannot be used as variable names or identifiers.

3. —- is any well-defined computational procedure that takes a value or a set of values as input and produces an output.
A) Algorithm
B) Flowchart
C) Program
D) process
Answer: (A) Explanation: An algorithm is a step-by-step procedure or a set of rules for solving a specific problem or accomplishing a specific task.

4. The algorithm should be effective, which means it must have —-
A) basic primitive
B) basic steps
C) complex primitive
D) complex steps
Answer: (A) Explanation: An effective algorithm should have basic primitive operations that can be executed efficiently.

5. Which of these statements is used for multi-way branching?
A) switch
B) for
C) if
D) auto
Answer: (A) Explanation: Switch statement in C is used for multi-way branching, allowing different code blocks to be executed based on different values of an expression.

6. Which statement is used to end the loop and move the control to the next statement outside the loop?
A) continue
B) break
C) exit
D) switch
Answer: (B) Explanation: Break statement is used to terminate the loop and transfer control to the next statement outside the loop.

7. Array is also known as —-
A) keyword
B) reserved word
C) subscripted variable
D) simple variable
Answer: (C) Explanation: Arrays in C are also known as subscripted variables because elements in an array are accessed using their indices or subscripts.

8. —- is the process of re-arranging a given set of objects in a specific order.
A) Searching
B) instantiation
C) sorting
D ) swapping
Answer: (C) Explanation: Sorting is the process of arranging a collection of items or data in a specific order, such as ascending or descending.

9. Every ‘C’ program can be thought of as a collection of —-
A) Keywords
B) functions.
C) variables
D) constants
Answer: (B) Explanation: In C, programs are typically structured as a collection of functions that perform specific tasks or operations.

10. To use the library function at of(), which header file must be included in the program?
A) math.h
B) string.h
C) process.h
D) conio.h
Answer: (A) Explanation: The math.h header file in C provides declarations for mathematical functions, including the “atof()” function.

11. Pointer arithmetic is possible for —- and —-, but it has no meaning of —– and —-.
A) multiplication, division, addition, subtraction
B) addition, subtraction, multiplication, division
C) preincrement, predecrement, postincrement, postdecrement
D) postincrement, postdecrement, preincrement, predecrement
Answer: (B) Explanation: Pointer arithmetic in C is supported for addition and subtraction operations. Multiplication and division operations are not meaningful with pointers.

12. —- is a special type of variable which is used to hold the address of the variable.
A) structure
B) union
C) pointer
D) void
Answer: (C) Explanation: Pointers in C are variables that store memory addresses. They are used to indirectly access and manipulate data stored in memory.

13. Which of the following is an invalid file open mode?
A) wb+
B) ab+
C) rb+
D) wr+
Answer: (D) Explanation: The file open mode “wr+” is invalid. The valid file open modes in C include “wb+” (write and read in binary mode), “ab+” (append and read in binary mode), and “rb+” (read and write in binary mode).

14. Which functions allow you to write individual characters to a stream?
A) fputc()
B) putc()
C) both A) and B)
D) none of these
Answer: (C) Explanation: Both the fputc() and putc() functions in C can be used to write individual characters to a stream.

15. —- is a representation of data and the operations allowed on that data.
A) program
B) data structure
C) data type
D) structure
Answer: (B) Explanation: A data structure in C is a way of organizing and storing data in a specific format. It defines the representation of data and the operations that can be performed on that data.

16. A data structure is said to be —- if its elements form a sequence.
A) bipolar
B) linear
C) polar
D) scalar
Answer: (B) Explanation: A linear data structure in C is one where the elements are arranged in sequential order. Examples include arrays, linked lists, stacks, and queues.

17. A stack is very useful in situations when data have to be stored and then retrieved in the —- order.
A) same
B) reverse
C) ascending
D) descending
Answer: (B) Explanation: A stack in C follows the Last-In-First-Out (LIFO) principle, where the last item pushed into the stack is the first one to be popped out. This allows data to be stored and retrieved in the reverse order of their insertion.

18. —- is useful in the evaluation of the arithmetic expression.
A) stack
B) queue
C) tree
D) Graph
Answer: (A) Explanation: A stack is commonly used in evaluating arithmetic expressions, particularly infix expressions, by storing operators and operands and applying them based on their precedence and associativity.

19. which of these principles is used in a stack?
A) Last in first out
B) First in first out
C) Last in last out
D) None of these
Answer: (A) Explanation: The principle of Last-In-First-Out (LIFO) is used in a stack where the most recently inserted item is the first one to be removed.

20. A stack is defined formally as a list in which all insertions and deletions are made at —-
A) same time
B ) same end
C ) different end
D) both A) and B)
Answer: (B) Explanation: In a stack, all insertions (push operation) and deletions (pop operation) are made at the same end, which is the top of the stack.

21. Linked lists enable insertion and removal of nodes at any position in the list in constant time but do not allow —-.
A ) random access.
B) displaying items
C) searching
D) all of these
Answer: (A) Explanation: Unlike arrays, linked lists do not allow direct access to elements by index. Random access requires traversing the list from the beginning, resulting in linear time complexity.

22. —- is a self-referential data type because it contains a pointer or links to another datum of the same type.
A) Stack
B) Queue
C) A linked list
D) None of these
Answer: (C) Explanation: A linked list is a data structure where each node contains data and a reference/pointer to the next node. This self-referential property makes linked lists useful for dynamically storing and accessing data.

23. In a singly linked list, the link field of —- contains a null pointer.
A) first node
B) any node
C) middle node
D) the last node
Answer: (D) Explanation: The last node in a singly linked list has its link field pointing to NULL, signifying the conclusion of the list.

24. In —-, the link field of the last node contains a null pointer.
A) stack
B) queue
C) singly linked list
D) circular linked list
Answer: (C) Explanation: In a singly linked list, the last node’s link field points to NULL, indicating the end of the list.

25. A node that has both a parent and at least one child is called —-
A) Nonleaf
B) leaf
C) root
D) root
Answer: (A) Explanation: In a tree, a nonleaf node is a node that has at least one child. Nonleaf nodes are also referred to as internal nodes or intermediate nodes.

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