WorksheetsJ277 - 2.2 - Use of Arrays up to 2D
Total questions: 8
Worksheet time: 4mins
What is an array in programming?
A data structure that stores elements in a key-value pair format.
A data structure that stores a collection of elements, typically of the same data type, in a contiguous memory location.
A function that performs operations on a set of numbers.
A loop that iterates over a sequence of numbers.
Which of the following is a valid way to declare a one-dimensional array in Python?
`array = [1, 2, 3, 4]`
`array = (1, 2, 3, 4)`
`array = {1, 2, 3, 4}`
`array = <1, 2, 3, 4>`
How do you access the third element in a one-dimensional array named `numbers` in Python?
`numbers[2]`
`numbers[3]`
`numbers[1]`
`numbers[0]`
What is the result of the following operation on a 1D array `arr = [5, 10, 15, 20]`: `arr[1] = 25`?
`[5, 10, 15, 20]`
`[5, 25, 15, 20]`
`[5, 10, 25, 20]`
`[25, 10, 15, 20]`
Which of the following best describes a two-dimensional array?
A list of lists where each element is a list.
A single list with multiple data types.
A dictionary with keys and values.
A set of unique elements.
How do you access the element in the second row and third column of a 2D array `matrix` in Python?
`matrix[1][2]`
`matrix[2][3]`
`matrix[3][2]`
`matrix[2][1]`
What is the result of the following operation on a 2D array `matrix = [[1, 2], [3, 4]]`: `matrix[0][1] = 5`?
`[[1, 2], [3, 4]]`
`[[1, 5], [3, 4]]`
`[[5, 2], [3, 4]]`
`[[1, 2], [5, 4]]`
In a 2D array, how would you describe the operation of iterating over each element in the array?
Nested loops where the outer loop iterates over rows and the inner loop iterates over columns.
A single loop iterating over all elements.
A recursive function call.
A function that returns the length of the array.
