1) Which of the following is a marker interface in Java?

2) What is the output of the following code snippet?

System.out.println(10 / 0);

3) Which of the following is true about Java interfaces?

4) What is the output of the following code snippet?

System.out.println(10 > 9 && 5 < 3);

5) Which keyword is used to prevent a method from being overridden in Java?

6) Which keyword is used to create an object without a reference in Java?

7) Which of the following is not a valid Java identifier?

8) Which of the following is true about constructors in Java?

9) Which keyword is used to define a method that cannot be overridden in Java?

10) Which of the following statements is true about method overriding in Java?

11) Which keyword is used to define a constant in Java?

12) What is the output of the following code snippet?

public class Main {

    public static void main(String[] args) {

        int arr[] = new int[5];

        System.out.println(arr.length);

    }

}

13) Which of the following is a correct way to declare a constant in Java?

14) Which of the following statements about static methods in Java is true?

15) What is the output of the following code snippet?

public class Main {

    public static void main(String[] args) {

        int x = 5;

        int y = 2;

        System.out.println(x % y);

    }

}

16) What is the output of the following code snippet?

public class Main {

    public static void main(String[] args) {

        System.out.println(5 + 2 * 3 / 2);

    }

}

17) Which of the following is true about method overriding in Java?

18) What is the output of the following code snippet?

public class Main {

    public static void main(String[] args) {

        System.out.println(Math.ceil(2.1));

    }

}

19) What is the output of the following code snippet?

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

System.out.println(arr[arr.length]);

20) What is the output of the following code snippet?

public class Main {

    public static void main(String[] args) {

        String str = "hello";

        str.toUpperCase();

        System.out.println(str);

    }

}

21) What is the output of the following code snippet?

public class Main {

    public static void main(String[] args) {

        int arr[] = {1, 2, 3, 4, 5};

        System.out.println(arr[5]);

    }

}

22) Which of the following statements about Java packages is true?

23) Which collection class allows null elements?

24) Which of the following is a correct way to declare and initialize an ArrayList in Java?

25) What is the output of the following code snippet?

public class Main {

    public static void main(String[] args) {

        String str = "Hello";

        str.concat(" World");

        System.out.println(str);

    }

}

26) What is the output of the following code snippet?

public class Main {

    public static void main(String[] args) {

        int x = 10;

        if (x > 5) {

            System.out.println("x is greater than 5");

        } else {

            System.out.println("x is less than or equal to 5");

        }

    }

}

27) What is the output of the following code snippet?

public class Main {

    public static void main(String[] args) {

        int x = 5;

        int y = 2;

        System.out.println(x / y);

    }

}

28) Which of the following is not a valid access modifier in Java?

29) What is the output of the following code snippet?

int[] arr = new int[5];

System.out.println(arr[0]);

30) Which of the following statements is true about Java packages?

31) What is the output of the following code snippet?

public class Main {

    public static void main(String[] args) {

        int x = 5;

        x += x++ + ++x;

        System.out.println(x);

    }

}

32) Which of the following is true about the "super" keyword in Java?

33) What is the output of the following code snippet?

public class Main {

    public static void main(String[] args) {

        String str = "Java";

        str.concat(" Programming");

        System.out.println(str);

    }

}

34) What is the output of the following Java code?

public class Main {

    public static void main(String[] args) {

        int x = 5;

        System.out.println(x++ + ++x);

    }

}

35) What is the correct way to create an instance of an abstract class in Java?

36) Which of the following statements is true about method overloading in Java?

37) What is the output of the following code snippet?

String str = "hello";

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

38) Which of the following is a valid declaration of a two-dimensional array in Java?

39) Which of the following is not a Java keyword?

40) What is the default value of a local variable in Java?