A Level Computer Science OCR Practice Exam

Which of the following best describes an array?

1. A collection of data types with fixed-length only

2. A combination of multiple data types in a flexible structure

3. A number of elements of one data type in an ordered manner

4. An unstructured collection of random values

The correct answer is: A number of elements of one data type in an ordered manner

An array is best described as a number of elements of one data type in an ordered manner. This definition highlights the critical aspects of an array: it is a structured collection where all the elements share the same data type, which allows for efficient use of memory and type consistency. The ordered nature of an array means that each element can be accessed using an index, providing predictable and efficient access patterns. The significance of having elements of one data type ensures that the array maintains uniformity, which is essential for operations like iteration and manipulation of the data. This characteristic also differentiates arrays from other data structures that allow for heterogeneous data types, thus simplifying certain computational tasks. In contrast, the other options describe characteristics that do not accurately define an array. Fixed length is specific but not inclusive, as arrays can vary in size; combining multiple data types pertains more to structures like objects or lists; and an unstructured collection with random values does not relate to the organized and indexed nature of arrays.