Python Lists MCQs with Answers

Question. Which of the following commands will create a list?
(a) \( list1 = list() \)
(b) \( list1 = [] \)
(c) \( list1 = list([1, 2, 3]) \)
(d) all of the mentioned
Answer: d
Explanation: Execute in the shell to verify

Question. What is the output when we execute list(“hello”)?
(a) [‘h’, ‘e’, ‘l’, ‘l’, ‘o’]
(b) [‘hello’]
(c) [‘llo’]
(d) [‘olleh’]
Answer: a
Explanation: Execute in the shell to verify.

Question. Suppose listExample is [‘h’,’e’,’l’,’l’,’o’], what is len(listExample)?
(a) 5
(b) 4
(c) None
(d) Error
Answer: a
Explanation: Execute in the shell and verify.

Question. Suppose list1 is [2445,133,12454,123], what is max(list1)?
(a) 2445
(b) 133
(c) 12454
(d) 123
Answer: c
Explanation: Max returns the maximum element in the list.

Question. Suppose list1 is [3, 5, 25, 1, 3], what is min(list1)?
(a) 3
(b) 5
(c) 25
(d) 1
Answer: d
Explanation: Min returns the minimum element in the list.

Question. Suppose list1 is [1, 5, 9], what is sum(list1)?
(a) 1
(b) 9
(c) 15
(d) Error
Answer: c
Explanation: Sum returns the sum of all elements in the list.

Question. To shuffle the list(say list1) what function do we use?
(a) list1.shuffle()
(b) shuffle(list1)
(c) random.shuffle(list1)
(d) random.shuffleList(list1)
Answer: c
Explanation: Execute in the shell to verify.

Question. Suppose list1 is [4, 2, 2, 4, 5, 2, 1, 0], Which of the following is correct syntax for slicing operation?
(a) print(list1[0])
(b) print(list1[:2])
(c) print(list1[:-2])
(d) all of the mentioned
Answer: d
Explanation: Slicing is allowed in lists just as in the case of strings.

Question. Suppose list1 is [2, 33, 222, 14, 25], What is list1[-1]?
(a) Error
(b) None
(c) 25
(d) 2
Answer: c
Explanation: -1 corresponds to the last index in the list.

Question. Suppose list1 is [2, 33, 222, 14, 25], What is list1[:-1]?
(a) [2, 33, 222, 14]
(b) Error
(c) 25
(d) [25, 14, 222, 33, 2]
Answer: a
Explanation: Execute in the shell to verify.

Question. What will be the output of the following Python code?
1. >>>names = ['Amir', 'Bear', 'Charlton', 'Daman']
2. >>>print(names[-1][-1])
(a) A
(b) Daman
(c) Error
(d) n
Answer: d
Explanation: Execute in the shell to verify.

Question. What will be the output of the following Python code?
1. names1 = ['Amir', 'Bear', 'Charlton', 'Daman']
2. names2 = names1
3. names3 = names1[:]
4.
5. names2[0] = 'Alice'
6. names3[1] = 'Bob'
7.
8. sum = 0
9. for ls in (names1, names2, names3):
10. if ls[0] == 'Alice':
11. sum += 1
12. if ls[1] == 'Bob':
13. sum += 10
14.
15.print sum
(a) 11
(b) 12
(c) 21
(d) 22
Answer: b
Explanation: When assigning names1 to names2, we create a second reference to the same list. Changes to names2 affect names1. When assigning the slice of all elements in names1 to names3, we are creating a full copy of names1 which can be modified independently.

Question. Suppose list1 is [1, 3, 2], What is list1 * 2?
(a) [2, 6, 4]
(b) [1, 3, 2, 1, 3]
(c) [1, 3, 2, 1, 3, 2]
(d) [1, 3, 2, 3, 2, 1]
Answer: c
Explanation: Execute in the shell and verify.

Question. Suppose list1 = [0.5 * x for x in range(0, 4)], list1 is:
(a) [0, 1, 2, 3]
(b) [0, 1, 2, 3, 4]
(c) [0.0, 0.5, 1.0, 1.5]
(d) [0.0, 0.5, 1.0, 1.5, 2.0]
Answer: c
Explanation: Execute in the shell to verify.

Question. What will be the output of the following Python code?
1. >>>list1 = [11, 2, 23]
2. >>>list2 = [11, 2, 2]
3. >>>list1 < list2 is
(a) True
(b) False
(c) Error
(d) None
Answer: b
Explanation: Elements are compared one by one.

Question. To add a new element to a list we use which command?
(a) list1.add(5)
(b) list1.append(5)
(c) list1.addLast(5)
(d) list1.addEnd(5)
Answer: b
Explanation: We use the function append to add an element to the list.

Question. To insert 5 to the third position in list1, we use which command?
(a) list1.insert(3, 5)
(b) list1.insert(2, 5)
(c) list1.add(3, 5)
(d) list1.append(3, 5)
Answer: b
Explanation: Execute in the shell to verify.

Question. To remove string “hello” from list1, we use which command?
(a) list1.remove(“hello”)
(b) list1.remove(hello)
(c) list1.removeAll(“hello”)
(d) list1.removeOne(“hello”)
Answer: a
Explanation: Execute in the shell to verify.

Question. Suppose list1 is [3, 4, 5, 20, 5], what is list1.index(5)?
(a) 0
(b) 1
(c) 4
(d) 2
Answer: d
Explanation: Execute help(list.index) to get details.

Question. Suppose list1 is [3, 4, 5, 20, 5, 25, 1, 3], what is list1.count(5)?
(a) 0
(b) 4
(c) 1
(d) 2
Answer: d
Explanation: Execute in the shell to verify.

Question. Suppose list1 is [3, 4, 5, 20, 5, 25, 1, 3], what is list1 after list1.reverse()?
(a) [3, 4, 5, 20, 5, 25, 1, 3]
(b) [1, 3, 3, 4, 5, 5, 20, 25]
(c) [25, 20, 5, 5, 4, 3, 3, 1]
(d) [3, 1, 25, 5, 20, 5, 4, 3]
Answer: d
Explanation: Execute in the shell to verify.

Question. Suppose listExample is [3, 4, 5, 20, 5, 25, 1, 3], what is list1 after listExample.extend([34, 5])?
(a) [3, 4, 5, 20, 5, 25, 1, 3, 34, 5]
(b) [1, 3, 3, 4, 5, 5, 20, 25, 34, 5]
(c) [25, 20, 5, 5, 4, 3, 3, 1, 34, 5]
(d) [1, 3, 4, 5, 20, 5, 25, 3, 34, 5]
Answer: a
Explanation: Execute in the shell to verify.

Question. Suppose listExample is [3, 4, 5, 20, 5, 25, 1, 3], what is list1 after listExample.pop(1)?
(a) [3, 4, 5, 20, 5, 25, 1, 3]
(b) [1, 3, 3, 4, 5, 5, 20, 25]
(c) [3, 5, 20, 5, 25, 1, 3]
(d) [1, 3, 4, 5, 20, 5, 25]
Answer: c
Explanation: pop() removes the element at the position specified in the parameter.

Question. Suppose listExample is [3, 4, 5, 20, 5, 25, 1, 3], what is list1 after listExample.pop()?
(a) [3, 4, 5, 20, 5, 25, 1]
(b) [1, 3, 3, 4, 5, 5, 20, 25]
(c) [3, 5, 20, 5, 25, 1, 3]
(d) [1, 3, 4, 5, 20, 5, 25]
Answer: a
Explanation: pop() by default will remove the last element.

Question. What will be the output of the following Python code?
1. >>>"Welcome to Python".split()
(a) [“Welcome”, “to”, “Python”]
(b) (“Welcome”, “to”, “Python”)
(c) {“Welcome”, “to”, “Python”}
(d) “Welcome”, “to”, “Python”
Answer: a
Explanation: split() function returns the elements in a list.

Question. What will be the output of the following Python code?
1. >>>list("a#b#c#d".split('#'))
(a) [‘a’, ‘b’, ‘c’, ‘d’]
(b) [‘a b c d’]
(c) [‘a#b#c#d’]
(d) [‘abcd’]
Answer: a
Explanation: Execute in the shell to verify.

Question. What will be the output of the following Python code?
1. myList = [1, 5, 5, 5, 5, 1]
2. max = myList[0]
3. indexOfMax = 0
4. for i in range(1, len(myList)):
5. if myList[i] > max:
6. max = myList[i]
7. indexOfMax = i
8.
9. >>>print(indexOfMax)
(a) 1
(b) 2
(c) 3
(d) 4
Answer: a
Explanation: First time the highest number is encountered is at index 1.

Question. What will be the output of the following Python code?
1. myList = [1, 2, 3, 4, 5, 6]
2. for i in range(1, 6):
3. myList[i - 1] = myList[i]
4.
5. for i in range(0, 6):
6. print(myList[i], end = " ")
(a) 2 3 4 5 6 1
(b) 6 1 2 3 4 5
(c) 2 3 4 5 6 6
(d) 1 1 2 3 4 5
Answer: c
Explanation: Execute in the shell to verify.

Question. What will be the output of the following Python code?
1. >>>list1 = [1, 3]
2. >>>list2 = list1
3. >>>list1[0] = 4
4. >>>print(list2)
(a) [1, 3]
(b) [4, 3]
(c) [1, 4]
(d) [1, 3, 4]
Answer: b
Explanation: Lists should be copied by executing [:] operation.

Question. What will be the output of the following Python code?
1. def f(values):
2. values[0] = 44
3.
4. v = [1, 2, 3]
5. f(v)
6. print(v)
(a) [1, 44]
(b) [1, 2, 3, 44]
(c) [44, 2, 3]
(d) [1, 2, 3]
Answer: c
Explanation: Execute in the shell to verify.

Question. What will be the output of the following Python code?
1. def f(i, values = []):
2. values.append(i)
3. return values
4.
5. f(1)
6. f(2)
7. v = f(3)
8. print(v)
(a) [1] [2] [3]
(b) [1] [1, 2] [1, 2, 3]
(c) [1, 2, 3]
(d) 1 2 3
Answer: c
Explanation: Execute in the shell to verify

Question. What will be the output of the following Python code?
1. names1 = ['Amir', 'Bala', 'Chales']
2.
3. if 'amir' in names1:
4. print(1)
5. else:
6. print(2)
(a) None
(b) 1
(c) 2
(d) Error
Answer: c
Explanation: Execute in the shell to verify.

Question. What will be the output of the following Python code?
1. names1 = ['Amir', 'Bala', 'Charlie']
2. names2 = [name.lower() for name in names1]
3.
4. print(names2[2][0])
(a) None
(b) a
(c) b
(d) c
Answer: d
Explanation: List Comprehension are a shorthand for creating new lists.

Question. What will be the output of the following Python code?
1. numbers = [1, 2, 3, 4]
2.
3. numbers.append([5,6,7,8])
4.
5. print(len(numbers))
(a) 4
(b) 5
(c) 8
(d) 12
Answer: b
Explanation: A list is passed in append so the length is 5.

Question. To which of the following the “in” operator can be used to check if an item is in it?
(a) Lists
(b) Dictionary
(c) Set
(d) All of the mentioned
Answer: d
Explanation: In can be used in all data structures.

Question. What will be the output of the following Python code?
1. list1 = [1, 2, 3, 4]
2. list2 = [5, 6, 7, 8]
3.
4. print(len(list1 + list2))
(a) 2
(b) 4
(c) 5
(d) 8
Answer: d
Explanation: + appends all the elements individually into a new list.

Question. What will be the output of the following Python code?
1. def addItem(listParam):
2. listParam += [1]
3.
4. mylist = [1, 2, 3, 4]
5. addItem(mylist)
6. print(len(mylist))
(a) 1
(b) 4
(c) 5
(d) 8
Answer: c
Explanation: + will append the element to the list.

Question. What will be the output of the following Python code?
1. def increment_items(L, increment):
2. i = 0
3. while i < len(L):
4. L[i] = L[i] + increment
5. i = i + 1
6.
7. values = [1, 2, 3]
8. print(increment_items(values, 2))
9. print(values)
(a) None [3, 4, 5]
(b) None [1, 2, 3]
(c) [3, 4, 5] [1, 2, 3]
(d) [3, 4, 5] None
Answer: a
Explanation: Execute in the shell to verify.

Question. What will be the output of the following Python code?
1. def example(L):
2. ''' (list) -> list
3. '''
4. i = 0
5. result = []
6. while i < len(L):
7. result.append(L[i])
8. i = i + 3
9. return result
(a) Return a list containing every third item from L starting at index 0
(b) Return an empty list
(c) Return a list containing every third index from L starting at index 0
(d) Return a list containing the items from L starting from index 0, omitting every third item
Answer: a
Explanation: Run the code to get a better understanding with many arguments.

Question. What will be the output of the following Python code?
1. veggies = ['carrot', 'broccoli', 'potato', 'asparagus']
2. veggies.insert(veggies.index('broccoli'), 'celery')
3. print(veggies)
(a) [‘carrot’, ‘celery’, ‘broccoli’, ‘potato’, ‘asparagus’]
(b) [‘carrot’, ‘celery’, ‘potato’, ‘asparagus’]
(c) [‘carrot’, ‘broccoli’, ‘celery’, ‘potato’, ‘asparagus’]
(d) [‘celery’, ‘carrot’, ‘broccoli’, ‘potato’, ‘asparagus’]
Answer: a
Explanation: Execute in the shell to verify.

Python Questions and Answers – Lists – 5

Question. What will be the output of the following Python code?
1. >>>m = [[x, x + 1, x + 2] for x in range(0, 3)]
(a) [[1, 2, 3], [4, 5, 6], [7, 8, 9]]
(b) [[0, 1, 2], [1, 2, 3], [2, 3, 4]]
(c) [1, 2, 3, 4, 5, 6, 7, 8, 9]
(d) [0, 1, 2, 1, 2, 3, 2, 3, 4]
Answer: b
Explanation: Execute in the shell to verify.

Question. How many elements are in m?
1. m = [[x, y] for x in range(0, 4) for y in range(0, 4)]
(a) 8
(b) 12
(c) 16
(d) 32
Answer: c
Explanation: Execute in the shell to verify.

Question. What will be the output of the following Python code?
1. values = [[3, 4, 5, 1], [33, 6, 1, 2]]
2.
3. v = values[0][0]
4. for row in range(0, len(values)):
5. for column in range(0, len(values[row])):
6. if v < values[row][column]:
7. v = values[row][column]
8.
9. print(v)
(a) 3
(b) 5
(c) 6
(d) 33
Answer: d
Explanation: Execute in the shell to verify.

Question. What will be the output of the following Python code?
1. values = [[3, 4, 5, 1], [33, 6, 1, 2]]
2.
3. v = values[0][0]
4. for lst in values:
5. for element in lst:
6. if v > element:
7. v = element
8.
9. print(v)
(a) 1
(b) 3
(c) 5
(d) 6
Answer: a
Explanation: Execute in the shell to verify.

Question. What will be the output of the following Python code?
1. values = [[3, 4, 5, 1 ], [33, 6, 1, 2]]
2.
3. for row in values:
4. row.sort()
5. for element in row:
6. print(element, end = " ")
7. print()
(a) The program prints two rows 3 4 5 1 followed by 33 6 1 2
(b) The program prints on row 3 4 5 1 33 6 1 2
(c) The program prints two rows 3 4 5 1 followed by 33 6 1 2
(d) The program prints two rows 1 3 4 5 followed by 1 2 6 33
Answer: d
Explanation: Execute in the shell to verify.

Question. What will be the output of the following Python code?
1. matrix = [[1, 2, 3, 4],
2. [4, 5, 6, 7],
3. [8, 9, 10, 11],
4. [12, 13, 14, 15]]
5.
6. for i in range(0, 4):
7. print(matrix[i][1], end = " ")
(a) 1 2 3 4
(b) 4 5 6 7
(c) 1 3 8 12
(d) 2 5 9 13
Answer: d
Explanation: Execute in the shell to verify.

Question. What will be the output of the following Python code?
1. def m(list):
2. v = list[0]
3. for e in list:
4. if v < e: v = e
5. return v
6.
7. values = [[3, 4, 5, 1], [33, 6, 1, 2]]
8.
9. for row in values:
10. print(m(row), end = " ")
(a) 3 33
(b) 1 1
(c) 5 6
(d) 5 33
Answer: d
Explanation: Execute in the shell to verify.

Question. What will be the output of the following Python code?
1. data = [[[1, 2], [3, 4]], [[5, 6], [7, 8]]]
2.
3. print(data[1][0][0])
(a) 1
(b) 2
(c) 4
(d) 5
Answer: d
Explanation: Execute in the shell to verify.

Question. What will be the output of the following Python code?
1. data = [[[1, 2], [3, 4]], [[5, 6], [7, 8]]]
2.
3. def ttt(m):
4. v = m[0][0]
5.
6. for row in m:
7. for element in row:
8. if v < element: v = element
9.
10. return v
11.
12.print(ttt(data[0]))
(a) 1
(b) 2
(c) 4
(d) 5
Answer: c
Explanation: Execute in the shell to verify.

Question. What will be the output of the following Python code?
1. points = [[1, 2], [3, 1.5], [0.5, 0.5]]
2. points.sort()
3. print(points)
(a) [[1, 2], [3, 1.5], [0.5, 0.5]]
(b) [[3, 1.5], [1, 2], [0.5, 0.5]]
(c) [[0.5, 0.5], [1, 2], [3, 1.5]]
(d) [[0.5, 0.5], [3, 1.5], [1, 2]]
Answer: c
Explanation: Execute in the shell to verify.