Apptitude Tests MCQ Short Questions On Array In BlueJ

In this page you will get number of short questions - MCQ apptitude test questions on array. 

 Q 1. Which of these operators is used to allocate memory to array variable in Java?
A. malloc

B. alloc

C. new

D. new malloc

Ans: C

Q 2. What will this code print?

 int arr[] = new int [5];

 System.out.print(arr);

A. 0
B. value stored in arr[0].
C. 00000
D. Garbage value

Ans: D

Q 3.  Which of these is an incorrect Statement?
A. It is necessary to use new operator to initialize an array.
B. Array can be initialized using comma separated expressions surrounded by curly braces.
C. Array can be initialized when they are declared.
D. None of the mentioned

Ans: A

Q 4. State the output
public void show()

{
    int arr[]=new int[5], i=0;
    while(i<5)
        arr[i]=++i;
    for(i=0; i<5; i++)
        System.out.print(" "+ arr[i]); 
}

A. 1 2 3 4 5
B. 0 1 2 3 4
C. Garbage Value 1 2 3 4
D. 1 2 3 4 Garbage Value

Ans: A

Q 5. State the output
public void show()
{
    int a[] = {5, 1, 15, 20, 25};
    int i, j, m;
    i = ++a[1];
    j = a[1]++;
    m = a[i++];
    System.out.print( i + ":"+ j +":" + m);  
}

A. 6:7:8
B. 4:5:6
C. 3:2:15
D. 2:3:4

Ans: C

Q 6.State the output
int a[] ={2,4,6,8,10};
a[0]=23;
a[3]=a[1];
int c= a[0]+a[1];
System.out.println("Sum = "+c);

A. Sum = 6
B. Sum = 27
C. Sum = 10
D. Sum = 31

Ans: B

Q 7.State the output
int a[4]={2,4,6,8};
for(i=0;i<=1;i++)
{
s=a[i]+a[3-i];
System.out.print(s+ " ");
}
A. 8 10
B. 10 10
C. 10 12
D. 8 12

Ans: B

Q 8. Difference between Subscript and Subscripted variable

Subscript is the index of the element in the array whereas Subscripted variable is the name of the array when it is used with a subscript to access a single element of the array.

Q 9. Difference between Ordinary variable and array variable

An ordinary variable can hold only one value whereas an array variable can refer to a group of values of the same data type by using a subscript.

Q 10. Difference between sorting and searching

Sorting	Searching
Sorting means to arrange the elements of the array in ascending or descending order.	Searching means to search for a term or value in an array.
Bubble sort and Selection sort are examples of sorting techniques.	Linear search and Binary search are examples of search techniques.

Q 11. Difference between Linear search and Binary search

Linear Search	Binary Search
Linear search works on sorted and unsorted arrays	Binary search works on only sorted arrays (ascending or descending)
Each element of the array is checked against the target value until the element is found or end of the array is reached	Array is successively divided into 2 halves and the target element is searched either in the first half or in the second half
Linear Search is slower	Binary Search is faster

 
Q 12. Selection sort and Bubble sort

Selection sort	Bubble sort
Selection Sort selects the smallest element from unsorted sub-array and swaps it with the leftmost unsorted element.	Bubble Sort compares adjacent elements and swaps them if they are in wrong order.
Performs lesser number of swaps to sort the same array relative to Bubble Sort	Performs more number of swaps to sort the array
Selection Sort is faster	Bubble Sort is slower

Q 13. length and length()

length	length()
length is an attribute i.e. a data member of array.	length() is a member method of String class.
It gives the length of an array i.e. the number of elements stored in an array.	It gives the number of characters present in a string.

Q. 14 What are the advantages of array

Ans: Using array we can store number of values of same time in same named space location. Also we can access any location value directly.

Q. 15 What are the limitations of array

Ans: There are many limitations of array. Array can store number of values but all are of same type. We can not store different type of values in a single array. An int type array can hold only int values.

Dynamic insertion and deletion of elements on array can be done but it is critical.

Q. 16 Why String is preferred over char type array

Both char type array and String are objects but array has only one data member - 'length' while String class has many methods and data members. Manipulation of String can be easily done through it's functions which is tough in case of char type array.

Q. 17 What are the advantages of index in array

There are many advantages of index in array. We can directly access any location value using the index. The array elements can be displayed from left to right or right to left using the index.

Q. 18 What are the different process of creating a numeric array

We can create an numeric array using the following techniques

1. int a[];

a=new int[10];

2. int a[]=new int[10];

3. int a[]={1,2,3,4,5};

Q. 19 State the relationship between array and loop

Loop and array are closely tied together. We need loop while assigning user input values in an array. We need loop to display array elements and any kind of searching and sorting of array elements, loop is essential.

 

Q. 20 If we pass an array to a function, is it call by value or call by reference?

If we use array as actual parameter or formal parameter, it is call by refernce.