PCEP Practice Test 10 — 10 Questions

Question 1

Which THREE of the following are immutable data types in Python?

Accepted Answer

str. In Python, str (A) is immutable because string objects cannot be modified in place—operations like concatenation or replace() return a new string rather than altering the original. int (B) is immutable since integer objects have a fixed value once created, and arithmetic operations produce new int objects instead of changing existing ones. float (C) is likewise immutable, as floating-point values cannot be changed after creation and any arithmetic yields a new float object. By contrast, list (D) is mutable because elements can be added, removed, or reassigned in place, and dict (E) is mutable because key-value pairs can be inserted, updated, or deleted after the dictionary is created.

Answer

list

Answer

dict

Question 2

Which TWO of the following are Python membership operators?

Accepted Answer

not in. Option B, 'not in', is a Python membership operator that evaluates to True when a specified value is absent from a sequence such as a list, tuple, string, or dictionary, making it correct. Option C, 'in', is likewise a membership operator that tests whether a value exists within a sequence, returning a Boolean result, so it is also correct. The other options are not membership operators: A 'not' is a logical (Boolean) operator, D 'is' is an identity operator that compares object identity, and E 'and' is a logical operator that combines Boolean expressions.

Answer

not

Answer

is

Answer

and

Question 3

A dictionary: d = {1: 'a', 2: 'b', 3: 'c'}. Which code will cause a KeyError?

Accepted Answer

d[4]. Accessing a dictionary key that does not exist using square bracket notation (d[4]) raises a KeyError. Since the dictionary d has keys 1, 2, and 3, the key 4 is absent, so d[4] triggers the error.

Answer

d.get(4)

Answer

if 4 in d: d[4]

Answer

d.setdefault(4, 'd')

Question 4

Arrange the steps to read data from a text file in Python.

Accepted Answer

Open the file, read the file contents, process the data, then close the file.. The correct sequence for reading data from a text file in Python is: first open the file using the open() function, then read its contents (e.g., with read() or readlines()), process the data as needed, and finally close the file with close(). Opening establishes a file handle, reading retrieves the data, processing uses it, and closing releases resources. Common mistakes include closing before processing, processing before reading, or reading before opening.

Answer

Open the file, read the file contents, close the file, then process the data.

Answer

Open the file, process the data, read the file contents, then close the file.

Answer

Read the file contents, open the file, process the data, then close the file.

Question 5

Which TWO of the following expressions produce the integer 5?

Accepted Answer

10 // 2. Option B, 10 // 2, is correct because the // operator performs floor division on integers, and 10 divided by 2 yields exactly 5 as an int. Option C, int(5.7), is correct because int() truncates the float toward zero, discarding the fractional part .7 and returning the integer 5. Option A, "5", is a string literal, not an integer, so it does not produce the integer 5. Option D, 5.0, is a floating-point value, not an int. Option E, 10 / 2, uses true division, which in Python 3 returns the float 5.0 rather than the integer 5.

Answer

"5"

Answer

5.0

Answer

10 / 2

Question 6

An application requires different messages based on temperature. Given:
temp = 25
if temp > 30:
    print('Hot')
elif temp > 20:
    print('Warm')
else:
    print('Cool')
What is the output?

Accepted Answer

Warm. The condition `temp > 30` is False (25 is not greater than 30), so the first `if` block is skipped. The `elif temp > 20` condition is True (25 > 20), so the `print('Warm')` statement executes, outputting 'Warm'. Option D is correct.

Answer

No output

Answer

Hot

Answer

Cool

Question 7

Order the steps to write a for loop that iterates over a range of numbers.

Accepted Answer

Start with 'for', then variable name, then 'in', then range() with start, stop, step, then colon, then indented loop body. The correct order is to write 'for', then the loop variable, then 'in', then the range() function with appropriate arguments, then a colon, and finally an indented block containing the statements to repeat. This structure defines a for loop that iterates over a sequence generated by range().

Answer

Start with range(), then 'for', then variable name, then 'in', then colon, then indented loop body

Answer

Start with 'for', then variable name, then colon, then 'in', then range(), then indented loop body

Answer

Start with 'for', then 'in', then variable name, then range(), then colon, then indented loop body

Question 8

Which TWO of the following expressions evaluate to True?

Accepted Answer

bool(1). Option C, bool(1), evaluates to True because any non-zero integer is truthy in Python, and 1 is the canonical non-zero value. Option D, bool('False'), also evaluates to True because any non-empty string is truthy regardless of its content — the string 'False' has five characters, so it is truthy. The unmarked options do not belong: bool('') is False because an empty string is falsy, bool([]) is False because an empty list is falsy, and bool(0) is False because zero is the integer falsy value.

Answer

bool('')

Answer

bool([])

Answer

bool(0)

Question 9

A program calculates BMI. User inputs weight and height as strings. Which line correctly converts to float?

Accepted Answer

weight = float(input()). `float(input())` first reads the user's input as a string via `input()`, then converts that string to a floating-point number using the `float()` function. This is the standard Python pattern for converting user input to a numeric type.

Answer

weight = float(input)

Answer

weight = input().float()

Answer

weight = input(float())

Question 10

Which two of the following are correct ways to create a dictionary in Python? (Choose two.)

Accepted Answer

my_dict = dict(a=1, b=2). Option B, my_dict = dict(a=1, b=2), is correct because the dict() constructor accepts keyword arguments, using the parameter names as string keys and the assigned values as their values, producing {'a': 1, 'b': 2}. Option D, my_dict = {'a':1, 'b':2}, is correct because it uses standard dictionary literal syntax with curly braces, colon-separated key-value pairs, and comma separators. Option A is invalid because bare identifiers a and b are treated as variables rather than string keys, so it raises a NameError unless those variables exist, and even then it would not create the intended string-keyed dictionary. Option C is invalid because dict() expects a single iterable of key-value pairs (e.g., dict([('a',1),('b',2)])), not multiple separate list arguments. Option E is invalid because square brackets denote a list, and the colon syntax inside them is not valid Python.

Answer

my_dict = {a:1, b:2}

Answer

my_dict = dict(['a',1],['b',2])

Answer

my_dict = ["a":1, "b":2]