PCEP Data Types, Variables, Basic I/O and Operators Practice Test 5 — 15 Questions

Question 1

Which THREE of the following are Python built-in data types?

Accepted Answer

bool. `bool` is a built-in data type in Python, used to represent Boolean values `True` and `False`. It is a subclass of `int` and is fundamental for logical operations and conditional expressions.

Answer

array

Answer

char

Question 2

Which TWO operators in Python yield an integer result when applied to two integers?

Accepted Answer

//. The floor division operator (//) always returns an integer result when both operands are integers, discarding any fractional part. For example, 7 // 2 yields 3, not 3.5. This is because floor division performs integer division and truncates toward negative infinity, ensuring the result type is int when both inputs are int.

Answer

**

Answer

*

Answer

/

Question 3

Refer to the exhibit. What is the cause of the error?

Accepted Answer

Using + on incompatible types (str and int). The error occurs because the `+` operator is being used between a string and an integer, which are incompatible types in Python. Python does not implicitly convert the integer to a string for concatenation; it raises a `TypeError: unsupported operand type(s) for +: 'str' and 'int'`.

Answer

Division by zero

Answer

Missing import statement

Answer

Variable not defined

Question 4

Given x = 100 and y = 105, what is the value of z if z = x + y?

Accepted Answer

205. The values of x and y are 100 and 105 respectively. The expression z = x + y calculates their sum: 100 + 105 = 205. Therefore, print(z) outputs 205.

Answer

200

Answer

25

Answer

250

Question 5

Refer to the exhibit. The code used is: name = input('Enter name: '); print('Hello', name). What will be printed if the user enters 'Alice'?

Accepted Answer

Hello Alice. The `input()` function captures the user's typed input as a string, and the `print()` function outputs the string 'Hello ' followed by the value of the `name` variable. When the user enters 'Alice', `name` becomes 'Alice', so the output is 'Hello Alice'.

Answer

Hello Bob

Answer

Error

Answer

Hello name

Question 6

A developer writes the following code: result = (5 + 3) * 2 ** 3 // 4. What is the value of result?

Accepted Answer

16. Python follows the operator precedence rules: exponentiation (**) is evaluated before multiplication and division, and multiplication/division are evaluated before addition/subtraction. The expression evaluates as: 2 ** 3 = 8, then (5 + 3) = 8, then 8 * 8 = 64, then 64 // 4 = 16. The integer division (//) yields an integer result of 16.

Answer

8

Answer

13

Answer

64

Question 7

Which of the following variable names is valid in Python?

Accepted Answer

_count. (_count) is valid because Python allows identifiers to start with an underscore, and it contains only letters and underscores. Python variable names must start with a letter or underscore, followed by letters, digits, or underscores, and cannot be a reserved keyword.

Answer

1st_value

Answer

my-var

Answer

class

Question 8

An accountant uses a Python script to calculate tax: tax = price * 0.08. For price=19.99, tax results in 1.5992. However, the output should be rounded to two decimal places. Which expression should replace the current one?

Accepted Answer

tax = round(price * 0.08, 2). The built-in `round()` function with a second argument of 2 rounds the floating-point result of `price * 0.08` to exactly two decimal places, which matches the requirement for currency formatting. The other options either omit rounding, round to an integer, or use integer truncation that can produce incorrect results for negative numbers or edge cases.

Answer

tax = round(price * 0.08)

Answer

tax = price * 0.08

Answer

tax = int(price * 0.08 * 100) / 100

Question 9

A junior developer writes: print('Hello' + 5). This code raises an error. What is the best way to fix it?

Accepted Answer

print('Hello' + str(5)). Python's `+` operator for strings requires both operands to be strings. The code `print('Hello' + 5)` raises a `TypeError` because it attempts to concatenate a string with an integer. Using `str(5)` converts the integer to the string `'5'`, allowing the concatenation to succeed and print `Hello5`.

Answer

print('Hello' * 5)

Answer

print('Hello', 5)

Answer

print('Hello' + '5')

Question 10

A script uses the input() function to get a user's age: age = input('Enter age: '). Later it computes age > 18. This raises a TypeError. What is the root cause?

Accepted Answer

The variable age is a string, not an integer.. The `input()` function in Python always returns a string, regardless of what the user types. When the user enters their age, the variable `age` holds a string like '25', not an integer. Comparing a string to an integer with the `>` operator raises a `TypeError` because Python does not automatically convert strings to numbers for comparison.

Answer

The input() function cannot read numbers.

Answer

The variable age is automatically converted to int.

Answer

The comparison operator > is not valid for strings.

Question 11

Which data type is the result of: value = 10 // 3?

Accepted Answer

int. The // operator in Python performs floor division, which divides the left operand by the right operand and returns the largest integer less than or equal to the result. Since both 10 and 3 are integers, the result is an integer (3), not a float. Therefore, the data type of value is int.

Answer

float

Answer

str

Answer

bool

Question 12

A program needs to check if a number is both positive and even. Which expression correctly implements this?

Accepted Answer

if num > 0 and num % 2 == 0:. It uses the logical `and` operator to combine two conditions: `num > 0` (checks if the number is positive) and `num % 2 == 0` (checks if the number is even). Both conditions must be true for the overall expression to be true, which correctly implements the requirement of checking if a number is both positive and even.

Answer

if num > 0 or num % 2 == 0:

Answer

if num > 0 & num % 2 == 0:

Answer

if num > 0 and % 2 == 0:

Question 13

Given the code: x = 10; y = 3.0; z = x / y; print(type(z)). What is the output?

Accepted Answer

. In Python, when you divide an integer by a float using the / operator, the result is always a float. Here, x is an integer (10) and y is a float (3.0), so z = 10 / 3.0 evaluates to 3.3333333333333335, which is of type float. The print(type(z)) outputs , making option B correct.

Answer

Answer

Answer

Question 14

A developer wants to output a variable price with two decimal places using formatting. Which line of code will produce 'Price: $12.50' for price = 12.5?

Accepted Answer

print(f'Price: ${price:.2f}'). It uses an f-string with the format specifier `:.2f`, which formats the float `12.5` as a string with exactly two decimal places, producing '12.50'. The f-string then interpolates this into the full string 'Price: $12.50'.

Answer

print('Price: $' + price)

Answer

print('Price: $' + str(round(price, 2)))

Answer

print('Price: $%s' % price)

Question 15

Which TWO of the following are valid ways to comment in Python?

Accepted Answer

# This is a comment. The hash symbol (#) is the standard syntax for single-line comments in Python. Everything after # on that line is ignored by the Python interpreter, making it a valid comment.

Answer

$ This is a comment

Answer

/* This is a comment */

Answer

// This is a comment