1000+ Data Structure MCQ for NMAT [Solved]

1. 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

2. The situation when in a linked list START=NULL is
A. underflow
B. overflow
C. housefull
D. saturated
Answer : A

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

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

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

6. When determining the efficiency of algorithm, the space factor is measured by
A. Counting the maximum memory needed by the algorithm
B. Counting the minimum memory needed by the algorithm
C. Counting the average memory needed by the algorithm
D. Counting the maximum disk space needed by the algorithm
Answer : A

7. 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

8. 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

9. 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

10. 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

11. 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

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

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

14. ……………. 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

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

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

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

18. 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

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

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

21. Which of the following data structure is linear type?
A. Graph
B. Binary tree
C. Trees
D. Stack
Answer : D

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

23. The memory address of fifth element of an array can be calculated by the formula
A. LOC(Array[5]=Base(Array)+w(5-lower bound), where w is the number of words per memory cell for the array
B. LOC(Array[5])=Base(Array[5])+(5-lower bound), where w is the number of words per memory cell for thearray
C. LOC(Array[5])=Base(Array[4])+(5-Upper bound), where w is the number of words per memory cell for the array
D. None of above
Answer : A

24. 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

25. 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

26. 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

27. When inorder traversing a tree resulted E A C K F H D B G; the preorder traversal would return
A. FAEKCDBHG
B. FAEKCDHGB
C. EAFKHDCBG
D. FEAKDCHBG
Answer : B

28. 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

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

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

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

32. 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

33. 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

34. 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

35. Which if the following is/are the levels of implementation of data structure
A. Application level
B. Abstract level
C. Implementation level
D. All of the above
Answer : D

36. The initial configuration of the queue is a,b,c,d (a is the front end). To get the configuration d,c,b,a one needs a minimum of ?
A. 3 additions and 2 deletions
B. 2 deletions and 3 additions
C. 3 deletions and 4 additions
D. 3 deletions and 3 additions
Answer : D

37. 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

38. Which of the following is not the required condition for binary search algorithm?
A. The list must be sorted
B. there should be the direct access to the middle element in any sublist
C. There must be mechanism to delete and/or insert elements in list
D. none of above
Answer : C

39. 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

40. 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

41. 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

42. Stack is also called as
A. Last in first out
B. First in last out
C. Last in last out
D. First in first out
Answer : A

43. _______ 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

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

45. The operation of processing each element in the list is known as
A. Sorting
B. Merging
C. Inserting
D. Taversal
Answer : D

46. For an algorithm the complexity of the average case is
A. Much more complicated to analyze than that of worst case
B. Much more simpler to analyze than that of worst case
C. Sometimes more complicated and some other times simpler than that of worst case
D. None or above
Answer : A

47. If the values of a variable in one module is indirectly changed by another module, this situation is called
A. internal change
B. inter-module change
C. side effect
D. side-module update
Answer : C

48. Linked list are not suitable data structure of which one of the following problems ?
A. Binary search
B. Insertion sort
C. Radix sort
D. Polynomial manipulation
Answer : A

49. 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

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