PCEP Practice Test 1 — 10 Questions

Question 1

Which TWO of the following exceptions are built-in Python exceptions? (Select exactly 2)

Accepted Answer

ZeroDivisionError. ZeroDivisionError is a built-in Python exception that is raised when the second operand of a division or modulo operation is zero. It is part of Python's standard exception hierarchy and is commonly encountered in arithmetic operations.

Answer

StringError

Answer

NumberError

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ListError

Question 2

A developer wants to read a floating-point number from user input and compute its square. Which code snippet correctly accomplishes this?

Accepted Answer

num = float(input()); result = num ** 2. It uses `float(input())` to convert the user's input (which is always a string) into a floating-point number, and then computes the square using the exponentiation operator `**`. This ensures that decimal values are handled correctly, which is required for computing the square of a floating-point number.

Answer

num = input(); result = num * num

Answer

result = input() ** 2

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num = int(input()); result = num ** 2

Question 3

Which TWO of the following expressions evaluate to True in Python? (Choose two.)

Accepted Answer

1 == True. In Python, the boolean value `True` is equal to the integer `1` due to the fact that `bool` is a subclass of `int`, and `True` is internally represented as `1`. The comparison `1 == True` evaluates to `True` because Python performs implicit type coercion, converting `True` to `1` before the equality check.

Answer

'0' == 0

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2 == True

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None == False

Question 4

What is the output when the following code is executed?

try:
    print(1/0)
except ZeroDivisionError:
    print("Cannot divide by zero")

Accepted Answer

Cannot divide by zero. The code inside the try block attempts to divide by zero, which raises a ZeroDivisionError. The except block catches this exception and executes its print statement, outputting 'Cannot divide by zero'.

Answer

The program crashes with an unhandled exception

Answer

Result: 0

Answer

Unsupported operand

Question 5

A function is defined as: def min_max(nums): return min(nums), max(nums). What type of value does it return?

Accepted Answer

A tuple. The function `min_max` uses `return min(nums), max(nums)`, which is a comma-separated list of expressions. In Python, when multiple values are returned separated by commas, they are automatically packed into a tuple. Therefore, the function returns a tuple containing the minimum and maximum values.

Answer

A set

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A dictionary

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A list

Question 6

A developer needs to implement a loop that prints numbers from 10 down to 1. Which loop correctly achieves this?

Accepted Answer

for i in range(10, 0, -1): print(i). `range(10, 0, -1)` generates numbers from 10 down to 1 inclusive. The start is 10, the stop is 0 (exclusive), and the step is -1, so the sequence is 10, 9, 8, ..., 1. This matches the requirement exactly.

Answer

for i in range(10, 0): print(i)

Answer

for i in reversed(range(1, 10)): print(i)

Answer

for i in range(10, 1, -1): print(i)

Question 7

Refer to the exhibit. What is the output?

Accepted Answer

1 2 (3, 4) {'x': 5, 'y': 6}. The code uses a tuple (3, 4) and a dictionary {'x': 5, 'y': 6} as arguments to the print() function. The print() function outputs each argument separated by a space, so the tuple is printed as (3, 4) and the dictionary as {'x': 5, 'y': 6}, preceded by 1 and 2. Option D correctly shows this output.

Answer

1 2 [3, 4] {'x': 5, 'y': 6}

Answer

1 2 (3, 4) {}

Answer

1 2 3 4 5 6

Question 8

Arrange the steps to install a third-party Python package using pip.

Accepted Answer

1. Ensure pip is installed. 2. Run 'pip install package_name'. 3. Verify the installation by importing the package in Python.. Installing packages with pip involves checking pip, running install, and verifying.

Answer

1. Run 'pip install package_name'. 2. Check if pip is installed. 3. Verify the installation.

Answer

1. Verify the installation by importing the package. 2. Ensure pip is installed. 3. Run 'pip install package_name'.

Answer

1. Download the package manually from a website. 2. Run 'pip install' with the downloaded file. 3. Check pip version.

Question 9

Which loop is more efficient for iterating over a large list when you only need the values, not indices?

Accepted Answer

for value in mylist:. Iterating directly over the list with `for value in mylist:` avoids the overhead of indexing or enumeration. This is the most efficient approach in Python for accessing only the values, as it uses the list's internal iterator, which is implemented in C and involves no function calls or index lookups per iteration.

Answer

for i in range(len(mylist)): value = mylist[i]

Answer

for i, value in enumerate(mylist):

Answer

for value in mylist[::-1]:

Question 10

Refer to the exhibit. What type of error occurred, and which line caused it?

Accepted Answer

ZeroDivisionError at line 3. The code attempts to divide by zero on line 3, which raises a ZeroDivisionError. In Python, any division where the denominator is zero (e.g., `x / 0`) triggers this runtime exception, and the traceback points to the exact line where the division occurs.

Answer

NameError at line 3

Answer

SyntaxError at line 1

Answer

ValueError at line 0