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

Question 1

A programmer writes the following code to calculate the average of two numbers:

a = 5
b = 2
avg = a / b
print(avg)

What is the output?

Accepted Answer

2.5. In Python 3, the / operator performs true division and always returns a float. With a = 5 and b = 2, a / b evaluates to 2.5. The other options reflect common mistakes: confusing / with //, truncating the result, or assuming an error where none exists. The correct output is 2.5.

Answer

Error: division by zero

Answer

2

Answer

2.0

Question 2

A quiz program stores a user's score as score = 7 and the number of questions as total = 2. The developer writes percentage = score / total * 100. What value is displayed?

Accepted Answer

350.0. Python 3 uses true division for the / operator, so dividing two integers yields a float. With score = 7 and total = 2, 7 / 2 is 3.5, and 3.5 * 100 is 350.0. The expression evaluates left to right, so the multiplication by 100 cannot be skipped. The displayed value includes a decimal because the result type is float.

Answer

350

Answer

3.5

Answer

TypeError

Question 3

A cashier script stores a price as a string and needs to apply a 10 percent discount. The code is:

price = "19.99"
discount = 0.10
final = price * (1 - discount)
print(final)

What happens when this code runs?

Accepted Answer

It raises a TypeError because a string cannot be multiplied by a float.. The * operator supports string repetition only when the other operand is an integer. Here the other operand is the float 0.9, so Python raises TypeError. To compute the discounted price the code must first convert the string to a number, for example float(price) * (1 - discount), and only then print the result.

Answer

It prints "19.99" repeated zero times, resulting in an empty string.

Answer

It prints 199.9 because the decimal point is ignored during multiplication.

Answer

It prints 17.991 because Python converts the string automatically.

Question 4

Consider the following code: `x = 5` then `y = 2` then `result = x // y * y + x % y`. What is the value of `result`?

Accepted Answer

`5`. The expression combines floor division, multiplication, and modulo. Due to left-to-right evaluation of operators with equal precedence, `x // y` is computed first, then multiplied by `y`, then `x % y` is computed and added. For `x = 5` and `y = 2`, this yields `(5 // 2) * 2 + (5 % 2) = 2 * 2 + 1 = 5`. This demonstrates the relationship between floor division and modulo.

Answer

`7`

Answer

`6`

Answer

`2`

Question 5

A Python programmer is analyzing the results of several expressions. Which TWO of the following expressions evaluate to a float value? (Choose two.)

Accepted Answer

4.0 // 2. In Python, the / operator always returns a float, so 4 / 2 yields 2.0. Additionally, floor division // returns a float if either operand is a float, so 4.0 // 2 yields 2.0. The other expressions involve only integers and use operators that return integers when both operands are integers. Thus, the expressions that evaluate to a float are 4 / 2 and 4.0 // 2.

Answer

4 + 2

Answer

4 * 2

Answer

4 // 2

Question 6

A login script checks whether a username entered by the user is exactly 'admin' and the account is not locked. The variable locked is a boolean. Which expression evaluates to True only when the username is 'admin' and locked is False?

Accepted Answer

username == 'admin' and not locked. The rule requires two conditions to hold together: the username must equal 'admin' and the account must not be locked. The and operator enforces both, while not locked converts the boolean to its opposite. Using or would allow access when only one condition is satisfied, and testing locked directly reverses the security check.

Answer

not username == 'admin' and not locked

Answer

username == 'admin' and locked

Answer

username == 'admin' or not locked

Question 7

A Python script contains:

print(10 / 4)
print(10 // 4)
print(10 % 4)

What output does this produce?

Accepted Answer

2.5, 2, 2. True division with / yields a float result, while floor division with // discards the fractional part to give a whole number, and the modulo operator % gives the remainder. For 10 and 4, these produce 2.5, 2, and 2 respectively. Recognizing that / and // behave differently is essential when predicting numeric output in Python.

Answer

2, 2, 2

Answer

2.5, 2.5, 2

Answer

2.5, 2, 0.5

Question 8

A Python script contains the following code:

price = 19.99
quantity = 3
total = price * quantity
print(type(total))

What is displayed when this script runs?

Accepted Answer

<class 'float'>. The multiplication of a float and an int in Python produces a float because Python applies numeric type promotion, converting the integer operand to a float before the operation. The variable total therefore holds a float, and type(total) displays the class object for floats. Integer output would require both operands to be int, and string output would require quoted text.

Answer

Answer

59.97

Answer

Question 9

A Python developer is reviewing a script that contains several variable declarations. They want to identify which assignments use valid variable names according to Python's naming rules. Which TWO of the following variable names are valid? (Choose two.)

Accepted Answer

my_var. Valid Python variable names must start with a letter or underscore, followed by letters, digits, or underscores, and must not be a reserved keyword. `my_var` and `_private` satisfy these rules, while `2nd_place` starts with a digit, `class` is a keyword, and `my-var` contains a hyphen.

Answer

my-var

Answer

2nd_place

Answer

class

Question 10

A developer writes a script that records a product price. The line is:

price = 19.99

Later, the script runs print(type(price)). What is displayed?

Accepted Answer

<class 'float'>. Python infers a variable's type from the value assigned to it, and any numeric literal with a decimal point becomes a float. The type function returns the class of the object, and printing that class shows the type name in angle brackets. Since 19.99 includes a decimal point, the output is the float class.

Answer

Answer

Answer

Question 11

A Python developer writes the following code to concatenate two strings:

first = 'Hello'
second = 'World'
result = first + ' ' + second
print(result)

What is the output?

Accepted Answer

Hello World. The + operator concatenates strings when both operands are strings. Here, first is 'Hello', then a space string ' ', then second is 'World'. The result is 'Hello World'. The other options either omit the space, include quotes, or predict an error that does not occur because all operands are strings.

Answer

HelloWorld

Answer

'Hello' 'World'

Answer

Error: cannot concatenate str and int

Question 12

A Python script stores a product identifier as id = '0042'. A developer needs to print the numeric value 42 followed by the type of the converted value in one line. Which code produces the output '42 <class 'int'>'?

Accepted Answer

print(int(id), type(int(id))). Converting the string '0042' with int() yields the integer 42, discarding leading zeros, and wrapping that same call in type() reports <class 'int'>. Passing both results to print() inserts a space between them, matching the required output. The other choices either skip the numeric conversion or produce a float instead of an int.

Answer

print(float(id), type(float(id)))

Answer

print(str(id), type(id))

Answer

print(int(id) + type(int(id)))

Question 13

A cashier script stores a discount rate and a price, then computes the final amount. The developer writes:

rate = 0.15
price = 200
final = price - price * rate
print(final)

What is printed?

Accepted Answer

170.0. Python evaluates multiplication before subtraction, so price * rate is computed first as 200 * 0.15, giving 30.0. That product is then subtracted from price, yielding 170.0. Because one operand is a float, the final result is a float and is displayed with a decimal point, distinguishing it from an integer result.

Answer

30.0

Answer

200.15

Answer

170

Question 14

A developer writes the following code to calculate a total price with tax:

price = 19.99
tax_rate = 0.08
total = price + price * tax_rate
print(round(total, 2))

What is printed?

Accepted Answer

21.59. Multiplication has higher precedence than addition, so price * tax_rate is evaluated first, producing the tax amount. That tax is then added to the base price, and the round function limits the result to two decimal places. The combined total is approximately 21.5892 before rounding, which becomes 21.59 when rounded to two decimal places.

Answer

1.6

Answer

21.5892

Answer

21.6

Question 15

A script starts with:

name = "Ada"
age = 36

Which line correctly prints: Ada is 36 years old

Accepted Answer

print(name, "is", age, "years old"). The print function accepts multiple arguments and inserts a space between each one, so it can mix strings and numbers without manual conversion. Concatenation with + requires both operands to be strings, so it fails when an integer is involved unless str is applied. The multi-argument form is the simplest correct way to produce the sentence.

Answer

print("name is age years old")

Answer

print(name + " is " + int(age) + " years old")

Answer

print(name + " is " + age + " years old")