1000+ Data Structure Multiple Choice Question Answer [Solved]

1. Which of the following data structure can't store the non-homogeneous data elements?
A. Arrays
B. Records
C. Pointers
D. Stacks
Answer : A

2. When new data are to be inserted into a data structure, but there is no available space; this situation is usually called
A. underflow
B. overflow
C. housefull
D. saturated
Answer : B

3. To represent hierarchical relationship between elements, Which data structure is suitable?
A. Tree
B. Graph
C. Priority
D. Dequeue
Answer : A

4. Which of the following data structure is non linear type?
A. Lists
B. Strings
C. Graph
D. Stacks
Answer : C

5. A ______ is a data structure that organizes data similar to a line in the supermarket, where the first one in line is the first one out.
A. Stacks linked list
B. Queue linked list
C. Both of them
D. Neither of them
Answer : B

6. Two main measures for the efficiency of an algorithm are
A. Processor and memory
B. Complexity and capacity
C. Time and space
D. Data and space
Answer : C

7. Arrays are best data structures
A. for relatively permanent collections of data
B. for the size of the structure and the data in the structure are constantly changing
C. for both of above situation
D. for none of above situation
Answer : A

8. The difference between linear array and a record is
A. An array is suitable for homogeneous data but the data items in a record may have different data type
B. In a record, there may not be a natural ordering in opposed to linear array.
C. A record form a hierarchical structure but a linear array does not
D. All of above
Answer : D

9. A variable P is called pointer if
A. P contains the address of an element in DATA.
B. P points to the address of first element in DATA
C. P can store only memory addresses
D. P contain the DATA and the address of DATA
Answer : A

10. When determining the efficiency of algorithm the time factor is measured by
A. Counting microseconds
B. Counting the number of key operations
C. Counting the number of statements
D. Counting the kilobytes of algorithm
Answer : B

11. The number of possible ordered trees with three nodes A,B,C is?
A. 16
B. 12
C. 6
D. 10
Answer : B

12. Which of the following is true about the characteristics of abstract data types?
i) It exports a type.
ii) It exports a set of operations
A. True, False
B. False, True
C. True, True
D. False, False
Answer : C

13. The complexity of merge sort algorithm is
A. O(n)
B. O(log n)
C. O(n2)
D. O(n log n)
Answer : D

14. Which data structure allows deleting data elements from and inserting at rear?
A. Stacks
B. Dequeues
C. Queues
D. Binary search tree
Answer : C

15. Which of the following case does not exist in complexity theory
A. Best case
B. Null case
C. Worst case
D. Average case
Answer : B

16. The elements of an array are stored successively in memory cells because
A. by this way computer can keep track only the address of the first element and the addresses of other elements can be calculated
B. the architecture of computer memory does not allow arrays to store other than serially
C. both of above
D. none of above
Answer : A

17. Which data structure is used in breadth first search of a graph to hold nodes?
A. Array
B. Stack
C. Tree
D. queue
Answer : D

18. _______ level is where the model becomes compatible executable code
A. Abstract level
B. Implementation level
C. Application level
D. All of the above
Answer : B

19. Given two sorted lists of size m and n respectively.The number of comparisons needed in the worst case by the merge sort algorithm will be?
A. mn
B. max(m,n)
C. min(m,n)
D. m+n-1
Answer : D

20. Binary search algorithm can not be applied to
A. sorted linked list
B. sorted binary trees
C. sorted linear array
D. pointer array
Answer : A

21. Finding the location of the element with a given value is:
A. Traversal
B. Search
C. Sort
D. None of above
Answer : B

22. Which of the following data structure is linear data structure?
A. Trees
B. Graphs
C. Arrays
D. None of above
Answer : C

23. The memory address of the first element of an array is called
A. floor address
B. foundation address
C. first address
D. base address
Answer : B

24. Which of the following statement is false?
A. Arrays are dense lists and static data structure
B. data elements in linked list need not be stored in adjacent space in memory
C. pointers store the next data element of a list
D. linked lists are collection of the nodes that contain information part and next pointer
Answer : C

25. Inserting an item into the stack when stack is not full is called _______ Operation and deletion of item form the stack, when stack is not empty is called _______operation.
A. push, pop
B. insert, delete
C. pop, push
D. delete, insert
Answer : A

26. Two dimensional arrays are also called
A. tables arrays
B. matrix arrays
C. both of above
D. none of above
Answer : C

27. Merge sort uses ?
A. Divide and conquer strategy
B. Backtracking approach
C. Heuristic search
D. Greedy approach
Answer : A

28. Which of the following algorithm design technique is used in the quick sort algorithm?
A. Dynamic programming
B. Greedy method
C. Divide and conquer
D. Backtracking
Answer : C

29. In linear search algorithm the Worst case occurs when
A. The item is somewhere in the middle of the array
B. The item is not in the array at all
C. The item is the last element in the array
D. The item is the last element in the array or is not there at all
Answer : D

30. Herder node is used as sentinel in ____
A. Graphs
B. Binary tree
C. Stacks
D. Queues
Answer : B

31. The complexity of Binary search algorithm is
A. O(n)
B. O(log )
C. O(n2)
D. O(n log n)
Answer : B

32. Which of the following statement is true ?
A. Breath first search cannot be used to find converted components of a graph.
B. Optimal binary search tree construction can be performed efficiently using dynamic programming.
C. Given the prefix and post fix walks over a binary tree.The binary tree cannot be uniquely constructe
D. Depth first search can be used to find connected components of a graph.
Answer : B

33. Which of the following is non-liner data structure?
A. List
B. Stacks
C. Trees
D. Strings
Answer : C

34. ______ is very useful in situation when data have to stored and then retrieved in reverse order.
A. Stack
B. Queue
C. List
D. Link list
Answer : A

35. ……………. Is a pile in which items are added at one end and removed from the other.
A. Queue
B. Stack
C. List
D. None of the above
Answer : A

36. A data structure where elements can be added or removed at either end but not in the middle
A. Linked lists
B. Stacks
C. Queues
D. Deque
Answer : D

37. _____ is not the component of data structure.
A. Operations
B. Algorithms
C. Storage Structures
D. None of above
Answer : D

38. The Average case occur in linear search algorithm
A. When Item is somewhere in the middle of the array
B. When Item is not in the array at all
C. When Item is the last element in the array
D. When Item is the last element in the array or is not there at all
Answer : A

39. The term push and pop is related to the
A. array
B. lists
C. stacks
D. all of above
Answer : C

40. Which of the following data structure is not linear data structure?
A. Arrays
B. Linked lists
C. Both of above
D. None of above
Answer : D

41. Which of the following name does not relate to stacks?
A. FIFO lists
B. LIFO list
C. Piles
D. Push-down lists
Answer : A

42. Which of the following data structure cant store the non-homogeneous data elements?
A. Arrays
B. Records
C. Pointers
D. None
Answer : A

43. Linked lists are best suited
A. for relatively permanent collections of data
B. for the size of the structure and the data in the structure are constantly changing
C. for both of above situation
D. for none of above situation
Answer : B

44. Which of the following data structure store the homogeneous data elements?
A. Arrays
B. Records
C. Pointers
D. None
Answer : A

45. Which of the following data structures are indexed structures?
A. linear arrays
B. linked lists
C. both of above
D. none of above
Answer : A

46. Which of the following is two way lst?
A. grounded header list
B. circular header list
C. linked list with header and trailer nodes
D. none of above
Answer : D

47. Each data item in a record may be a group item composed of sub-items; those items which are indecomposable are called
A. elementary items
B. atoms
C. scalars
D. all of above
Answer : D

48. The number of swapping needed to sort numbers 8,22,7,9,31,19,5,13 in ascending order using bubble sort is ?
A. 11
B. 12
C. 13
D. 14
Answer : D

49. Which one of the following permutations can be obtained the output using stack assuming that the input is the sequence 1,2,3,4,5 in that order ?
A. 3,4,5,2,1
B. 3,4,5,1,2
C. 5,4,3,1,2
D. 1,5,2,3,4
Answer : A

50. Which of the following is not the part of ADT description?
A. Data
B. Operations
C. Both of the above
D. None of the above
Answer : D