Variables and Data Types – Multiple Choice Questions (MCQs)

1. 49. What is the index of the last element of an array of size `n` in Java?

   • A. n
   • B. n-1
   • C. 0
   • D. depends on the array

2. 50. What happens if you try to access an element at an invalid index in an array in Java?

   • A. It returns null
   • B. It returns 0
   • C. It throws an ArrayIndexOutOfBoundsException
   • D. It creates a new element

3. 51. What is a multi-dimensional array in Java?

   • A. An array of arrays
   • B. An array that can store elements of different data types
   • C. An array with more than one dimension
   • D. Both A and C

4. 52. How do you declare a 2D integer array with 3 rows and 4 columns in Java?

   • A. int array[3][4];
   • B. int[][] array = new int[3][4];
   • C. int[3][4] array;
   • D. array int[3][4];