Data Structure MCQ Solved Paper for RRB NTPC

1. 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

2. 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

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

4. 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

5. 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

6. 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

7. 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

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

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

10. 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

11. A binary search tree whose left subtree and right subtree differ in hight by at most 1 unit is called ……
A. AVL tree
B. Red-black tree
C. Lemma tree
D. None of the above
Answer : A

12. Each array declaration need not give, implicitly or explicitly, the information about
A. the name of array
B. the data type of array
C. the index set of the array
D. the first data from the set to be stored
Answer : D

13. _______ 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

14. 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

15. 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

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

17. 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

18. 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

19. 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

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

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

22. 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

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

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. 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

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

27. 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

28. 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

29. 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

30. 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

31. 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

32. 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

33. 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

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

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

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

37. 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

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

39. 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

40. 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

41. 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

42. ……………. 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

43. 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 the array
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

44. 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

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

46. Identify the data structure which allows deletions at both ends of the list but insertion at only one end.
A. Stack
B. Input restricted dequeue
C. Priority queues
D. Output restricted qequeue
Answer : B

47. 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

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

49. 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

50. 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