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TCS Xplore 2023 - JAVA MCQ question for best practice ( iON Proctored Assessment )

           Multiple Choice Question ( JAVA )


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PART - 01 

Q1 . What is size of float and double ?

        a.  32 and 64                      b. 32 and 32 

        c.  64 and 64                      d. 64 and 32 

Ans : 32 and 64 


Q2 .  What will be the output ? 

          short x=10;

          x*=5;

          System.out.println(x);

        a.  50                                b. 10

        c.  No output                    d. Compilation Error

Ans : Compilation Error


Q3.  find the error in which line ? 

        class A{

            final a;

            System.out.println(a);

            }

        a.  Line 1                           b. Line 2

        c.  Line 3                           d. No Error

Ans : Line 2


Q4.  Find the length of String ?

        a. using string.length()

        b. using string.length

Ans : a 


Q5.  Find the output ?

class A{

          .........

        }

       class Solution{

            Box box[]={b1,b2,b3,b4,b5};

            for(int i=0;i<box.length();i++){

                System.out.println(box[i]);

           }

       }

        a.    No Error                               b. error

        c.  print all array object               d. none of these 


Q6.  Objects includes ?

        a.  Attributes                           b. both

        c.  Behaviour                      d. none

Ans : c


Q7.   String str="I like JAVA";

         System.out.println(str.length());

        a. 11                          b. 10

        c.  9                           d. 3

Ans : a


Q8.  What is the extension of java file ?

Ans : .java


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PART - 02



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Q9.  Which of this is Super class of every class ?

        a.  String  class                    b. Object class 

        c.  Abstract class                  d. ArrayList class

Ans : b


Q10.  Which modifier is used to prevent any method or attribute to be not visible to external classes ? 

        a. private                           b. protected

        c.  public                           d. default

Ans : a


Q11.  All the classes can be simultaneously imported by which wildcard ? 

Ans : *


Q12.   Which of the following is the correct declaration of array of size 10 ?

        a.  int arr[10];

        b. int arr[10]=new int[10];

        c.  int arr[]=new int[10];

        d. int arr[]={10 elements };

Ans : c and d


Q13. public class Solution{

public static void main(String[] args){ byte x = 127; x++; x++; System.out.print(x); } }

Ans : -127 (Range of byte data in java is -128 to 127. But the byte data type in java is cyclic in nature.)

Q14. Arrays in java are -

        a. object references                          b. primitive data type

        c.  objects                                        d. none

Ans : objects


Q15.  Identify what can directly access and change the value of the variable res.

                Package com.mypackage;

                Public class Solution{

                           Private int res = 100;

                }

        a.  Any class                                                      b.  Solution class

        c.  Any class that extends Solution  class          d.  None

Ans :  b


Q16.     Identify the output of the following program.

            String str = “abcde”;

           System.out.println(str.substring(1, 3));

        a.  abc                                     b. bc

        c.  bcd                                    d. cd

Ans : b


Q17.    Identify the output of the following program.

          String str = “Hellow”;

         System.out.println(str.indexOf(t));

        a.  4                                     b. 3

        c.  6                                    d. -1

Ans : d ( because t is not present in the string )


Q18.   Identify the output of the following program.


Public class Test{

          Public static void main(String argos[]){

                   String str1 = “one”;

                   String str2 = “two”;

                   System.out.println(str1.concat(str2));

          }

}

Ans : onetwo


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Part : 03


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Q19.    How many objects will be created in the following?


String a = new String(“Interviewbit”);

String b = new String(“Interviewbit”);

Strinc c = “Interviewbit”;

String d = “Interviewbit”;

Ans : 3


Q20.   Find the output of the following code.

                   int ++a = 100;

                  System.out.println(++a);

Ans :  compilation error ( not a valid identifier )


Q21.  Find the output of the following code.


Public class Solution{

         Public static void main(String args[]){

                 Int i;

                 for(i = 1; i < 6; i++){ 

                     if(i > 3) continue;

                 }

                 System.out.println(i);

          }

}

Ans : 6


Q22.  Identify the infinite loop ?

        a.  for(;;)                                      b. for(int i=0;i<1;i--)

        c.  for(int i=0;;i++)                      d. All of the above

Ans : d


Q23.   Evaluate the following Java expression, if x=3, y=5, and z=10:

               ++z + y - y + z + x++

Ans :   25


Q24.    What are the types of memory allocated in memory in java?


a.   Heap memory

b.  Stack memory

c.  Both A and B

d.  None of these

Answer: C) Both A and B


Q25.  What is the entry point of a program in Java?


a.  main() method

b.  The first line of code

c.   Last line of code

d.   main class

Answer:  A) main() method


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