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Java Language | 20 Minute‐Test 9

Instruction

  • Total number of questions : 20.
  • Time alloted : 20 minutes.
  • Each question carry 1 mark.
  • No Negative marks
  • DO NOT refresh the page.
  • All the best :-).

1.

Which data type value is returned by all transcendental math functions?

A.
int
B.
float
C.
double
D.
long

Your Answer: Option (Not Answered)

Correct Answer: Option C

Explanation:

None.
2.

What is the output of this program?

    class array_output {

        public static void main(String args[])

        {

                char array_variable [] = new char[10];

      for (int i = 0; i < 10; ++i) {

                array_variable[i] = 'i';

                System.out.print(array_variable[i] + "" );

                i++;

            } 

       }

    }
A.
i i i i i
B.
0 1 2 3 4
C.
i j k l m
D.
None of the mentioned

Your Answer: Option (Not Answered)

Correct Answer: Option A

Explanation:

None.
3.

What is the output of this program?

    class evaluate {

       public static void main(String args[])

        {

            int a[] = {1,2,3,4,5};

            int d[] = a;

            int sum = 0;

            for (int j = 0; j < 3; ++j)

                sum += (a[j] * d[j + 1]) + (a[j + 1] * d[j]);

            System.out.println(sum);

        }

    }
A.
38
B.
39
C.
40
D.
41

Your Answer: Option (Not Answered)

Correct Answer: Option C

Explanation:

None
4.

What is the output of this program?

    class char_increment {

        public static void main(String args[])

        {

            char c1 = 'D';

            char c2 = 84;

            c2++;

            c1++;

            System.out.println(c1 + " "  + c2);

        }

    }
A.
E U
B.
U E
C.
V E
D.
U F

Your Answer: Option (Not Answered)

Correct Answer: Option A

Explanation:

Operator ++ increments the value of character by 1. c1 and c2 are given values D and 84, when we use ++ operator their values increments by 1, c1 and c2 becomes E and U respectively.
5.

What is the output of this program?

    class array_output {

        public static void main(String args[])

        {

            int array_variable [] = new int[10];

      for (int i = 0; i < 10; ++i) {

                array_variable[i] = i;

                System.out.print(array_variable[i] + " ");

                i++;

            }

        }

    }
A.
0 2 4 6 8
B.
1 3 5 7 9
C.
0 1 2 3 4 5 6 7 8 9
D.
1 2 3 4 5 6 7 8 9 10

Your Answer: Option (Not Answered)

Correct Answer: Option A

Explanation:

When an array is declared using new operator then all of its elements are initialized to 0 automatically. for loop body is executed 5 times as whenever controls comes in the loop i value is incremented twice, first by i++ in body of loop then by ++i in increment condition of for loop.
6.

What is the output of this program?

    class increment {

        public static void main(String args[])

        {

            double var1 = 1 + 5;

            double var2 = var1 / 4;

            int var3 = 1 + 5;

            int var4 = var3 / 4;

            System.out.print(var2 + " " + var4);

         }

    }
A.
1 1
B.
0 1
C.
1.5 1
D.
1.5 1.0

Your Answer: Option (Not Answered)

Correct Answer: Option C

Explanation:

None
7.

What is the output of this program?

    class bitwise_operator {

        public static void main(String args[])

        {

            int var1 = 42;

            int var2 = ~var1;

            System.out.print(var1 + " " + var2);

               }

    }
A.
42 42
B.
43 43
C.
42 -43
D.
42 43

Your Answer: Option (Not Answered)

Correct Answer: Option C

Explanation:

Unary not operator, ~, inverts all of the bits of its operand. 42 in binary is 00101010 in using ~ operator on var1 and assigning it to var2 we get inverted value of 42 i:e 11010101 which is -43 in decimal.
8.

What is the output of this program?

    class Relational_operator {

        public static void main(String args[])

        {

            int var1 = 5;

            int var2 = 6;

            System.out.print(var1 > var2);

        }

    }
A.
1
B.
0
C.
true
D.
false

Your Answer: Option (Not Answered)

Correct Answer: Option D

Explanation:

Operator > returns a boolean value. 5 is not greater than 6 therefore false is returned.
9.

What is the output of this program?

    class operators {

        public static void main(String args[])

        {

            int var1 = 5;

            int var2 = 6;

            int var3;

            var3 = ++ var2 * var1 / var2 + var2;

            System.out.print(var3);

        }

    }
A.
10
B.
11
C.
12
D.
56

Your Answer: Option (Not Answered)

Correct Answer: Option C

Explanation:

Operator ++ has the highest precedence than / , * and +. var2 is incremented to 7 and then used in expression, var3 = 7 * 5 / 7 + 7, gives 12.
10.

What is the output of this program?

    class selection_statements {

        public static void main(String args[])

        {

            int var1 = 5;

            int var2 = 6;

            if ((var2 = 1) == var1)

                System.out.print(var2);

            else

                System.out.print(++var2);

        }

    }
A.
1
B.
2
C.
3
D.
4

Your Answer: Option (Not Answered)

Correct Answer: Option B

Explanation:

var2 is initialised to 1. The conditional statement returns false and the else part gets executed.
11.

What is the output of this program?

    class main_class {

        public static void main(String args[])

        {

            int x = 9;

            if (x == 9) {

                int x = 8;

                System.out.println(x);

            }

        }

    }
A.
9
B.
8
C.
Compilation error
D.
Runtime error

Your Answer: Option (Not Answered)

Correct Answer: Option C

Explanation:

Two variables with the same name can’t be created in a class.
12.

What is the output of this program?

    class box {

        int width;

        int height;

        int length;

        int volume;

        void volume(int height, int length, int width) {

             volume = width*height*length;

        }

    }

        class Prameterized_method{

        public static void main(String args[])

        {

            box obj = new box();

            obj.height = 1;

            obj.length = 5;

            obj.width = 5;

            obj.volume(3,2,1);

            System.out.println(obj.volume);

                }

    }
A.
0
B.
1
C.
6
D.
25

Your Answer: Option (Not Answered)

Correct Answer: Option C

Explanation:

None.
13.

What is the output of this program?

    class box {

        int width;

        int height;

        int length;

        int volume;

        box() {

            width = 5;

            height = 5;

            length = 6;

        }

        void volume() {

             volume = width*height*length;

        }

    }

        class constructor_output { 

       public static void main(String args[])

        {

            box obj = new box();

            obj.volume();

            System.out.println(obj.volume);

        }

   }
A.
100
B.
150
C.
200
D.
250

Your Answer: Option (Not Answered)

Correct Answer: Option B

Explanation:

None.
14.

What is the output of this program?

    class overload

{

        int x; int y;

        void add(int a) {

            x =  a + 1;

        }        void add(int a, int b){

            x =  a + 2;

        }

            }

        class Overload_methods { 

       public static void main(String args[])  

      {      

      overload obj = new overload();  

            int a = 0;  

          obj.add(6);     

       System.out.println(obj.x);  

           } 

 }
A.
5
B.
6
C.
7
D.
8

Your Answer: Option (Not Answered)

Correct Answer: Option C

Explanation:

None.
15.

What is the output of this program?

    class access{

        public int x; private int y;

        void cal(int a, int b){

            x =  a + 1;

            y =  b;

        }

            }

        class access_specifier {

        public static void main(String args[])

        {

            access obj = new access();

               obj.cal(2, 3);

            System.out.println(obj.x + " " + obj.y);

             }

   }
A.
3 3
B.
2 3
C.
Runtime Error
D.
Compilation Error

Your Answer: Option (Not Answered)

Correct Answer: Option C

Explanation:

None.
16.

Which of these methods must be made static?

A.
main()
B.
delete()
C.
run()
D.
finalize()

Your Answer: Option (Not Answered)

Correct Answer: Option A

Explanation:

main() method must be declared static, main() method is called by Java’s run time system before any object of any class exists.
17.

What is the output of this program?

    class string_demo

{

        public static void main(String args[]) 

       {

            String obj = "I" + "like" + "Java";

               System.out.println(obj);

             }

   }
A.
I
B.
like
C.
Java
D.
IlikeJava

Your Answer: Option (Not Answered)

Correct Answer: Option D

Explanation:

Java defines an operator +, it is used to concatenate strings.
18.

What is the output of this program?

    class A {

        int i;

        void display() {

            System.out.println(i);

        }

    }

        class B extends A {

        int j;

        void display() {

            System.out.println(j);

        }

    }

        class inheritance_demo {

        public static void main(String args[])

        {

            B obj = new B();

            obj.i=1;

            obj.j=2;

               obj.display();

             } 

 }
A.
0
B.
1
C.
2
D.
Compilation Error

Your Answer: Option (Not Answered)

Correct Answer: Option C

Explanation:

class A & class B both contain display() method, class B inherits class A, when display() method is called by object of class B, display() method of class B is executed rather than that of Class A.
19.

Which of these is supported by method overriding in Java?

A.
Abstraction
B.
Encapsulation
C.
Polymorphism
D.
None of the mentioned

Your Answer: Option (Not Answered)

Correct Answer: Option C

Explanation:

None.
20.

Which of these class relies upon its subclasses for complete implementation of its methods?

A.
Object class
B.
abstract class
C.
ArrayList class
D.
None of the mentioned

Your Answer: Option (Not Answered)

Correct Answer: Option B

Explanation:

None.
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