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

Question 1

A developer writes the following code: x = 5; y = 2; print(x // y). What is the output?

Accepted Answer

2. The floor division operator (//) in Python returns the largest integer less than or equal to the result of the division. Since 5 divided by 2 equals 2.5, the floor is 2, and the result is an integer (int) because both operands are integers. Therefore, the output is 2.

Answer

1

Answer

2.0

Answer

2.5

Question 2

A junior developer writes: x = 10; y = 3; print(x % y). What will be printed?

Accepted Answer

1. The modulo operator (%) returns the remainder of the division of the left operand by the right operand. Here, 10 divided by 3 equals 3 with a remainder of 1, so print(x % y) outputs 1.

Answer

3.33

Answer

0

Answer

3

Question 3

A developer needs to convert a string '25' to an integer and then add 10. Which code correctly performs this?

Accepted Answer

print(int('25') + 10). Option A is correct because `int('25')` converts the string '25' to the integer 25, and then `+ 10` performs integer addition, resulting in 35. The `print()` function outputs the result. This follows Python's type conversion rules where explicit conversion is required to combine a string and an integer in arithmetic.

Answer

print('25' + 10)

Answer

print(int('25') + '10')

Answer

print('25' + str(10))

Question 4

What is the correct way to read a floating-point number from user input and store it in a variable?

Accepted Answer

x = float(input()). Option C is correct because `float(input())` first reads the user input as a string via `input()`, then converts that string to a floating-point number using the `float()` function. This is the standard and only valid way in Python to obtain a float from console input, as `input()` always returns a string.

Answer

x = input(float())

Answer

x = input() as float

Answer

x = input().float()

Question 5

A developer wants to assign the value 3.14 to a variable and later change it to the integer 3. Which of the following is true?

Accepted Answer

This is allowed because Python is dynamically typed.. Option C is correct because Python is dynamically typed, meaning variables can be reassigned to values of any type at runtime. The developer can first assign the float 3.14 to a variable and later reassign the integer 3 to the same variable without any type declaration or conversion function required.

Answer

This is allowed only if the variable was declared as a float.

Answer

This causes a TypeError because you cannot change types.

Answer

This is allowed only if you use the int() function during assignment.

Question 6

Which of the following is a valid variable name in Python?

Accepted Answer

_count. Option C (_count) is correct because in Python, variable names can start with an underscore, and underscores are allowed anywhere in the name. The name _count follows all Python identifier rules: it starts with a letter or underscore, contains only letters, digits, or underscores, and is not a reserved keyword.

Answer

my-var

Answer

2nd_place

Answer

class

Question 7

A developer writes: print(10 * '5'). What is the output?

Accepted Answer

5555555555. In Python, the multiplication operator (*) when used with a string and an integer performs string repetition. The expression 10 * '5' repeats the string '5' ten times, resulting in the string '5555555555'. The print() function then outputs this concatenated string without quotes.

Answer

10

Answer

50

Answer

5

Question 8

What is the result of the expression: print(2 ** 3 ** 2) ?

Accepted Answer

512. The expression `2 ** 3 ** 2` uses the exponentiation operator `**`, which in Python is right-associative. This means it is evaluated as `2 ** (3 ** 2)`, not `(2 ** 3) ** 2`. First, `3 ** 2` equals 9, then `2 ** 9` equals 512. Therefore, option A is correct.

Answer

256

Answer

64

Answer

128

Question 9

A beginner writes: x = '10'; y = 20; print(x + y). What happens?

Accepted Answer

Raises TypeError. Option A is correct because Python's type system does not allow implicit concatenation of a string and an integer. The variable `x` is a string (`'10'`), and `y` is an integer (`20`). The `+` operator with these types triggers a `TypeError: unsupported operand type(s) for +: 'int' and 'str'` (or vice versa), as Python refuses to guess the programmer's intent.

Answer

Prints 30

Answer

Prints 10 + 20

Answer

Prints 1020

Question 10

Which operator is used to check if two values are equal in Python?

Accepted Answer

==. Option D is correct because the == operator is Python's equality comparison operator, used to check if two values are equal. It returns True if the values are equal and False otherwise, making it the standard way to test equality in conditions and expressions.

Answer

=

Answer

eq

Answer

!=

Question 11

A developer writes: a = 3; b = 4; c = a + b / 2. What is the value of c?

Accepted Answer

5.0. In Python, the division operator `/` always returns a float, and operator precedence dictates that division is performed before addition. Thus, `b / 2` evaluates to `4 / 2 = 2.0`, then `a + 2.0` yields `3 + 2.0 = 5.0`. Option D is correct because the result is a float value of 5.0.

Answer

3

Answer

3.5

Answer

5

Question 12

Which TWO of the following are valid ways to create a variable with the integer value 100?

Accepted Answer

x = int('100'). Option C is correct because the `int()` function converts a string containing a valid integer literal, such as '100', into an integer value of 100. This is a standard type-casting operation in Python that explicitly creates an integer from a string representation.

Answer

x = 0100

Answer

x = 100.0

Answer

x = '100'

Question 13

Which THREE of the following expressions evaluate to True?

Accepted Answer

3 == 3. Option A is correct because the equality operator '==' compares the integer values 3 and 3, which are identical, so the expression evaluates to True. In Python, '==' checks for value equality, not identity, and since both operands are the same integer literal, the result is True.

Answer

1 < 0

Answer

4 > 5

Question 14

Which TWO of the following are valid Python data types?

Accepted Answer

str. Option B (str) is correct because Python uses 'str' as its built-in type for textual data, which is a sequence of Unicode characters. This is a fundamental data type in Python, distinct from other languages that might use 'string' or 'char'.

Answer

real

Answer

array

Answer

char

Question 15

Which THREE of the following are correct uses of the print() function?

Accepted Answer

print('Hello', 'World', sep='-'). Option B is correct because the print() function in Python 3 accepts a 'sep' keyword argument that specifies the separator between multiple arguments. Here, sep='-' causes the output to be 'Hello-World', demonstrating a valid and commonly used feature of print().

Answer

print 'Hello'

Answer

print('Hello', 5)