Variables and Data Types – Multiple Choice Questions (MCQs)

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

   • A. String
   • B. Class
   • C. Object
   • D. int

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

   • A. byte
   • B. short
   • C. long
   • D. String

3. 3. What is the size of an `int` data type in Java?

   • A. 8 bits
   • B. 16 bits
   • C. 32 bits
   • D. 64 bits

4. 4. What is the size of a `byte` data type in Java?

   • A. 8 bits
   • B. 16 bits
   • C. 32 bits
   • D. 64 bits

5. 5. What is the size of a `short` data type in Java?

   • A. 8 bits
   • B. 16 bits
   • C. 32 bits
   • D. 64 bits

6. 6. What is the size of a `long` data type in Java?

   • A. 8 bits
   • B. 16 bits
   • C. 32 bits
   • D. 64 bits

7. 7. What is the size of a `float` data type in Java?

   • A. 32 bits
   • B. 64 bits
   • C. 80 bits
   • D. 128 bits

8. 8. What is the size of a `double` data type in Java?

   • A. 32 bits
   • B. 64 bits
   • C. 80 bits
   • D. 128 bits

9. 9. What is the size of a `boolean` data type in Java?

   • A. 1 bit
   • B. 8 bits
   • C. JVM-dependent
   • D. 16 bits

10. 10. What is the size of a `char` data type in Java?

    • A. 8 bits
    • B. 16 bits
    • C. 32 bits
    • D. 64 bits

11. 11. What is the default value of a numeric primitive data type in Java?

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

12. 12. What is the default value of a `boolean` data type in Java?

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