Introduction to Java – Multiple Choice Questions (MCQs)

1. 13. Which of the following is a single-line comment in Java?

   • A. // comment
   • B. /* comment */
   • C.
   • D. ## comment

2. 14. Which of the following is a multi-line comment in Java?

   • A. // comment
   • B. /* comment */
   • C.
   • D. ## comment

3. 15. What is the purpose of `System.out.println()`?

   • A. To read input from the console
   • B. To print output to the console with a newline
   • C. To print output to the console without a newline
   • D. To format output

4. 16. What is the output of `System.out.println(2 + 3 * 4);`?

   • A. 14
   • B. 20
   • C. 12
   • D. 10

5. 17. Which of the following is a primitive data type in Java?

   • A. String
   • B. Integer
   • C. Boolean
   • D. int

6. 18. Which of the following is a reference data type in Java?

   • A. int
   • B. float
   • C. boolean
   • D. String

7. 19. What is the default value of an integer variable in Java?

   • A. 0
   • B. null
   • C. undefined
   • D. depends on the JVM

8. 20. What is the default value of a boolean variable in Java?

   • A. TRUE
   • B. FALSE
   • C. null
   • D. 0

9. 21. What is the default value of a reference variable in Java?

   • A. 0
   • B. null
   • C. undefined
   • D. an empty string

10. 22. Which keyword is used to declare a constant variable in Java?

    • A. const
    • B. final
    • C. immutable
    • D. static

11. 23. What is the output of `System.out.println(5 / 2);`?

    • A. 2.5
    • B. 2
    • C. 2
    • D. 3

12. 24. What is the output of `System.out.println(5 % 2);`?

    • A. 1
    • B. 2
    • C. 2.5
    • D. 0