Python Arrays Quiz - MCQ Questions and Answers

Welcome to the Python Arrays Quiz! This quiz aims to help beginners understand the concept of arrays in Python. Arrays in Python, which are available through the array module, are a collection of elements of the same type, offering efficient storage and handling of data. Test your knowledge on Python arrays and enhance your understanding of how to use them effectively in Python programming!

1. What is an array in Python?

a) A collection of elements of different data types

b) A collection of elements of the same data type

c) A key-value pair collection

d) A collection of functions

Answer:

b) A collection of elements of the same data type

Explanation:

An array in Python is a collection of elements that are of the same data type, providing efficient storage and manipulation.

2. How do you import the array module in Python?

a) import array

b) import arrays

c) from python import array

d) include array

Answer:

a) import array

Explanation:

The array module is imported into a Python script using 'import array'.

3. Which of the following is the correct way to create an array of integers in Python?

a) array.array('i', [1, 2, 3])

b) array('i', [1, 2, 3])

c) [1, 2, 3]

d) (1, 2, 3)

Answer:

a) array.array('i', [1, 2, 3])

Explanation:

An array of integers is created using array.array with the type code 'i' for integers.

4. How do you add an element to the end of an array?

a) append(element)

b) push(element)

c) add(element)

d) insert(element)

Answer:

a) append(element)

Explanation:

The append() method adds a single element to the end of an array.

5. How do you access the first element of an array named 'myArray'?

a) myArray[0]

b) myArray[1]

c) myArray.first()

d) myArray(0)

Answer:

a) myArray[0]

Explanation:

Array indices in Python start at 0, so the first element is accessed with myArray[0].

6. What is the output of len(myArray) if myArray is an array with 3 elements?

a) 2

b) 3

c) 4

d) Error

Answer:

b) 3

Explanation:

The len() function returns the number of elements in the array, which is 3 in this case.

7. How do you remove the last element from an array?

a) pop()

b) removeLast()

c) delete()

d) cut()

Answer:

a) pop()

Explanation:

The pop() method removes and returns the last element from the array.

8. How do you insert an element at the beginning of an array?

a) insert(0, element)

b) append(0, element)

c) prepend(element)

d) addFirst(element)

Answer:

a) insert(0, element)

Explanation:

The insert() method with index 0 is used to insert an element at the beginning of an array.

9. What will be the output of the following code?

   myArray = array.array('i', [1, 2, 3])
   myArray.append(4)
   print(myArray)

a) array('i', [1, 2, 3])

b) array('i', [1, 2, 3, 4])

c) array('i', [4, 1, 2, 3])

d) Error

Answer:

b) array('i', [1, 2, 3, 4])

Explanation:

The append() method adds the element 4 to the end of the array.

10. How do you create a new array by copying an existing array?

a) newArray = myArray

b) newArray = myArray.copy()

c) newArray = array.array(myArray.typecode, myArray)

d) newArray = copy(myArray)

Answer:

c) newArray = array.array(myArray.typecode, myArray)

Explanation:

A new array is created by using the array constructor with the typecode of the existing array and passing the existing array.

11. What is the purpose of the typecode in an array?

a) To specify the size of the array

b) To define the functions available in the array

c) To specify the type of elements in the array

d) To set the maximum value of elements in the array

Answer:

c) To specify the type of elements in the array

Explanation:

The typecode in an array defines the data type of the elements in the array.

12. How do you find the index of the first occurrence of an element in an array?

a) index(element)

b) find(element)

c) locate(element)

d) search(element)

Answer:

a) index(element)

Explanation:

The index() method returns the index of the first occurrence of the specified element.

13. What does the following code do? myArray.reverse()

a) Sorts the array in ascending order

b) Sorts the array in descending order

c) Reverses the order of elements in the array

d) Does nothing

Answer:

c) Reverses the order of elements in the array

Explanation:

The reverse() method reverses the order of the elements in the array.

14. How do you remove a specific element from an array?

a) delete(element)

b) remove(element)

c) pop(element)

d) cut(element)

Answer:

b) remove(element)

Explanation:

The remove() method removes the first occurrence of the specified element.

15. Can you change the value of an existing element in an array?

a) Yes

b) No

c) Only if it is an integer

d) Only if it is the last element

Answer:

a) Yes

Explanation:

Unlike tuples, the elements of an array can be changed or updated.

16. What will be the output of the following code?

 myArray = array.array('i', [1, 2, 3])
   del myArray[1]
   print(myArray)

a) array('i', [1, 2])

b) array('i', [1, 3])

c) array('i', [2, 3])

d) Error

Answer:

b) array('i', [1, 3])

Explanation:

The del statement removes the element at the specified index from the array.

17. What is the correct way to iterate over an array in Python?

a) for element in myArray: ...

b) for i in range(myArray.length()): ...

c) while element in myArray: ...

d) for each element in myArray: ...

Answer:

a) for element in myArray: ...

Explanation:

The for loop is used to iterate over each element in the array directly.

18. How do you concatenate two arrays in Python?

a) Using the + operator

b) Using the append() method

c) Using the extend() method

d) Using the concatenate() method

Answer:

a) Using the + operator

Explanation:

Two arrays can be concatenated using the + operator.

19. How do you copy the elements of an array to a list in Python?

a) list(myArray)

b) myArray.toList()

c) list.copy(myArray)

d) myList = myArray

Answer:

a) list(myArray)

Explanation:

The list constructor can be used to convert an array into a list.

20. What will be the output of the following code?

myArray = array.array('i', [1, 2, 3, 4, 5])
   print(myArray[1:4])

a) array('i', [1, 2, 3])

b) array('i', [2, 3, 4])

c) array('i', [2, 3, 4, 5])

d) array('i', [1, 2, 3, 4])

Answer:

b) array('i', [2, 3, 4])

Explanation:

The slicing operation myArray[1:4] returns a new array containing elements from index 1 up to, but not including, index 4.