L3 Array Concepts Quiz

What is an array?

• A collection of elements of different data types

• A collection of elements of the same data type stored in contiguous memory locations

• A structure that allows random access to elements

• A linked list of elements of the same type

Which of the following is the correct syntax for declaring an array in Java?

• int arr = new int[5];

• int[] arr = new int[5];

• int arr[] = new int();

• int arr[] = int[5];

How do you access the first element of an array named 'numbers'?

• numbers[0];

• numbers[1];

• numbers.first();

• numbers.firstElement();

What will happen if you try to access an index out of bounds in an array?

• It will return null.

• It will throw an ArrayIndexOutOfBoundsException.

• It will cause a compilation error.

• It will return 0.

What is the time complexity for searching an element in an unsorted array?

• O(1)

• O(n)

• O(log n)

• O(n²)

What does the length property of an array return?

• The total number of bytes the array occupies

• The size of the array (number of elements)

• The maximum value that can be stored in the array

• The sum of all elements in the array

Which of the following operations can be done directly in an array?

• Insert an element in the middle

• Access an element by index

• Delete an element

• Resize the array

What is the default value of an uninitialized integer array in Java?

• 0

• null

• -1

• undefined

What is the space complexity of an array?

• O(1)

• O(n)

• O(log n)

• O(n²)

Which method is used to sort an array in Java?

• Arrays.order()

• Arrays.sort()

• Arrays.arrange()

• Arrays.sortArray(