Quiz on Arrays

Complete this sentence: Arrays are ................. data structures.

Answer explanation

Arrays are linear because their elements are arranged in a sequential manner. They are homogenous as they store elements of the same type, and static since their size is fixed upon creation.

Which of the following is TRUE about arrays?

• Arrays store data in a certain order

• All data in an array are of the same data type

• Each element has a corresponding index value

• All of the above

Answer explanation

All statements about arrays are true: they store data in a specific order, contain elements of the same data type, and each element has a corresponding index value. Therefore, the correct answer is 'All of the above'.

Complete this sentence: ................. module is initiated from Python library to work with arrays.

Answer explanation

The correct choice is 'array' because the Python library provides the 'array' module specifically designed to work with arrays, making it the most appropriate completion for the sentence.

Complete this sentence: Index of an array starts with ..................

Answer explanation

The index of an array in most programming languages, such as C, C++, and Python, starts at 0. This means the first element of the array is accessed with index 0, making '0' the correct answer.

An array number_of_students represents 10 students’ marks. Which of the following represents this array declaration?

• number_of_students=array('i', range(10))

• number_of_students=array.array('i', range(1,10))

• number_of_students=array.array('i', range(10))

• None of the above

Answer explanation

The correct choice is 'number_of_students=array.array('i', range(10))' because it properly declares an array of integers with 10 elements, using the 'array' module in Python. The other options either use incorrect syntax or range.

A program prompts the user to input values to an array. What programming structure is required for this?

• Case structures

• If... else....

• Iteration

• None of the above

Answer explanation

Iteration is required to repeatedly prompt the user for input values to fill an array. This allows the program to collect multiple inputs until a specified condition is met, making it the correct choice.

An array student mark consists of data: [90,85,70,75,80]. What is the output of print(student mark[3])?

• 70

• 75

• 80

Answer explanation

In Python, array indexing starts at 0. Therefore, student mark[3] refers to the fourth element in the array, which is 75. Thus, the output of print(student mark[3]) is 75.

A two-dimensional array Array_2d consists of data: [[1, 2, 3, 4], [5, 6, 7, 8], [9, 10, 11, 12]]. What is the output of print(Array_2d[1])?

• [1, 2, 3, 4]

• [5, 6, 7, 8]

• [9, 10, 11, 12]

Answer explanation

Array_2d[1] accesses the second row of the 2D array, which is [5, 6, 7, 8]. Therefore, the output of print(Array_2d[1]) is [5, 6, 7, 8], making it the correct choice.

A two-dimensional array Array_2d consists of data: [[1, 2, 3, 4], [5, 6, 7, 8], [9, 10, 11, 12]]. What is the output of print(Array_2d[1][1])?

• 1

• 2

• 5

• 6

Answer explanation

Array_2d[1][1] accesses the second row (index 1) and the second element (index 1) of that row. The second row is [5, 6, 7, 8], and the second element is 6. Therefore, the output is 6.

Which of the following is used to separate a two-dimensional array into elements?

• for row in Array_name: for element in row:

• for column in Array_name: for element in column:

• for element in Array_name:

• None of the above

Answer explanation

The correct choice, 'for row in Array_name: for element in row:', effectively iterates through each row of a two-dimensional array and then through each element within that row, allowing access to all elements in the array.