Question 1

Which of the following statements about Python lists is TRUE?

Accepted Answer

Lists are mutable and can store heterogeneous data types.

Question 2

Given the code: myList = [3, "cat", 6.5, 2], what is the result of myList[2]?

Accepted Answer

6.5

Question 3

Which operation would you use to combine two lists in Python?

Accepted Answer

list1 + list2

Question 4

Suppose you have a list: aList = [1, 2, 3, 4]. What does aList * 3 produce?

Accepted Answer

[1, 2, 3, 4, 1, 2, 3, 4, 1, 2, 3, 4]

Question 5

Which method would you use to add an item to the end of a Python list?

Accepted Answer

append()

Question 6

You are given a list of exam scores: scores = [88, 92, 75, 91, 88]. Which built-in function returns the highest score?

Accepted Answer

max(scores)

Question 7

What is the output of list("the quick fox")?

Accepted Answer

["t", "h", "e", " ", "q", "u", "i", "c", "k", " ", "f", "o", "x"]

Question 8

Which of the following is NOT a valid dictionary key in Python?

Accepted Answer

[1, 2, 3]

Question 9

You want to count the frequency of each word in a list of words. Which Python collection type is most appropriate?

Accepted Answer

Dictionary

Question 10

Given the following code:

$$	ext{data} = [2, 5, 7, 2, 5, 2]$$

What is the output of the following function?

$$	ext{def modeatst(aList):}$$
$$\quad 	ext{countDict = \{\}}$$
$$\quad 	ext{for item in aList:}$$
$$\quad \quad 	ext{if item in countDict:}$$
$$\quad \quad \quad 	ext{countDict[item] += 1}$$
$$\quad \quad 	ext{else:}$$
$$\quad \quad \quad 	ext{countDict[item] = 1}$$
$$\quad 	ext{maxcount = max(countDict.values())}$$
$$\quad 	ext{modeList = []}$$
$$\quad 	ext{for item in countDict:}$$
$$\quad \quad 	ext{if countDict[item] == maxcount:}$$
$$\quad \quad \quad 	ext{modeList.append(item)}$$
$$\quad 	ext{return modeList}$$

Accepted Answer

[2]

Question 11

Which of the following best describes the difference between lists and strings in Python?

Accepted Answer

Lists are mutable, while strings are immutable.

Question 12

Suppose you want to visualize the frequency of test scores in a class. Which Python library and function would you use?

Accepted Answer

matplotlib.pyplot and hist()

Question 13

Given a list: values = [10, 20, 30, 40, 50], what is the result of values[1:4]?

Accepted Answer

[20, 30, 40]

Question 14

Which function from the statistics module would you use to calculate the standard deviation of a list of numbers?

Accepted Answer

statistics.stdev()

Question 15

You are given a list: data = [4, 8, 6, 5, 3]. What is the result of applying the following formula for range?

$$	ext{Range} = \max(data) - \min(data)$$

Accepted Answer

5

Question 16

A hospital records the number of patients admitted each day for a week: [12, 15, 14, 15, 13, 15, 14]. What is the mode of this data?

Accepted Answer

15

Question 17

Which of the following code snippets correctly creates a dictionary to store the number of books each student has borrowed from the library?

Accepted Answer

books = {"Alice": 3, "Bob": 5, "Carol": 2}

Question 18

Which list method would you use to remove all items from a list?

Accepted Answer

clear()

Question 19

A researcher collects the following data: [7, 8, 9, 10, 11]. What is the median value?

Accepted Answer

9

Question 20

Which of the following statements about the split() method for strings is TRUE?

Accepted Answer

split() divides a string into a list of substrings using a specified delimiter.

Python Collections: Lists, Strings, Dictionaries, and Basic Statistics

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