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Data Structure Questions and Answers –
Array and Array Operations
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This set of Data Structure Multiple Choice Questions & Answers (MCQs) focuses on
“Array and Array Operations―.
1. Which of these best describes an array?
a) A data structure that shows a hierarchical behavior
b) Container of objects of similar types
c) Arrays are immutable once initialised
d) Array is not a data structure
View Answer
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2. How do you initialize an array in C?
a) int arr[3] = (1,2,3);
b) int arr(3) = {1,2,3};
c) int arr[3] = {1,2,3};
d) int arr(3) = (1,2,3);
View Answer
3. How do you instantiate an array in Java?
a) int arr[] = new int(3);
b) int arr[];
c) int arr[] = new int[3];
d) int arr() = new int(3);
View Answer
4. Which of the following is the correct way to declare a multidimensional array in Java?
a) int[] arr;
b) int arr[[]];
c) int[][]arr;
d) int[[]] arr;
View Answer
5. What is the output of the following Java code?
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public class array
{
public static void main(String args[])
{
int []arr = {1,2,3,4,5};
System.out.println(arr[2]);
System.out.println(arr[4]);
}
}
a) 3 and 5
b) 5 and 3
c) 2 and 4
d) 4 and 2
View Answer
6. What is the output of the following Java code?
public class array
{
public static void main(String args[])
{
int []arr = {1,2,3,4,5};
System.out.println(arr[5]);
}
}
a) 4
b) 5
c) ArrayIndexOutOfBoundsException
d) InavlidInputException
View Answer
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7. When does the ArrayIndexOutOfBoundsException occur?
a) Compile-time
b) Run-time
c) Not an error
d) Not an exception at all
View Answer
8. Which of the following concepts make extensive use of arrays?
a) Binary trees
b) Scheduling of processes
c) Caching
d) Spatial locality
View Answer
9. What are the advantages of arrays?
a) Objects of mixed data types can be stored
b) Elements in an array cannot be sorted
,c) Index of first element of an array is 1
d) Easier to store elements of same data type
View Answer
10. What are the disadvantages of arrays?
a) Data structure like queue or stack cannot be implemented
b) There are chances of wastage of memory space if elements inserted in an array are lesser
than the allocated size
c) Index value of an array can be negative
d) Elements are sequentially accessed
View Answer
11. Assuming int is of 4bytes, what is the size of int arr[15];?
a) 15
b) 19
c) 11
d) 60
View Answer
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12. In general, the index of the first element in an array is __________
a) 0
b) -1
c) 2
d) 1
View Answer
13. Elements in an array are accessed _____________
a) randomly
b) sequentially
c) exponentially
d) logarithmically
View Answer
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Data Structure Questions and Answers –
Stack Operations – 1
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This set of Data Structure Multiple Choice Questions & Answers (MCQs) focuses on
“Stack Operations – 1―.
1. Process of inserting an element in stack is called ____________
a) Create
b) Push
c) Evaluation
d) Pop
View Answer
Answer: b
Explanation: Push operation allows users to insert elements in the stack. If the stack is filled
completely and trying to perform push operation stack – overflow can happen.
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