Python Quiz

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

• 2value

• value_2

• value-2

• value 2

Answer explanation

In Python, variable names must start with a letter or underscore, and can contain letters, numbers, and underscores. 'value_2' is valid, while '2value' starts with a number, 'value-2' contains a hyphen, and 'value 2' has a space.

Which of these is not a keyword in Python?

• lambda

• global

• eval

• yield

Answer explanation

In Python, 'lambda', 'global', and 'yield' are all keywords used for specific functionalities. However, 'eval' is a built-in function, not a keyword, making it the correct choice for this question.

What will be the result of 3 + 4 * 2?

• 14

• 11

• 10

• 7

Answer explanation

According to the order of operations (PEMDAS/BODMAS), we first multiply 4 by 2, which gives 8. Then, we add 3, resulting in 11. Therefore, the correct answer is 11.

What is the output of 10 // 3?

• 3.33

• 4

• 3

• 3.0

Answer explanation

The expression 10 // 3 performs integer division, which returns the largest integer less than or equal to the division result. Thus, 10 divided by 3 equals 3 with a remainder, so the output is 3.

Which of the following functions is used to convert a string to integer?

• str()

• int()

• float()

• input()

Answer explanation

The function int() is used to convert a string representation of a number into an integer. The other options serve different purposes: str() converts to a string, float() converts to a float, and input() takes user input as a string.

What does the expression 9 % 4 evaluate to?

• 2

• 1

• 0

• 3

Answer explanation

The expression 9 % 4 calculates the remainder of 9 divided by 4. When 9 is divided by 4, it goes 2 times (8), leaving a remainder of 1. Therefore, 9 % 4 evaluates to 1.

Which operator is used for exponentiation (power) in Python?

• ^

• **

• ^^

• exp()

Answer explanation

In Python, the operator for exponentiation (raising to a power) is '**'. For example, '2 ** 3' equals 8. The other options are incorrect: '^' is a bitwise XOR, '^^' is not valid, and 'exp()' is a function for exponentials.

Which function is used to take input from the user?

• scanf()

• cin

• input()

• read()

Answer explanation

The function input() is used in Python to take input from the user. While scanf() and cin are used in C and C++ respectively, input() is the correct choice for Python.

Which data type is returned by input() in Python 3?

• int

• float

• string

• boolean

Answer explanation

In Python 3, the input() function always returns data as a string, regardless of what the user enters. Therefore, the correct answer is 'string'.

Which of the following expressions will result in a TypeError?

• int("10")

• float("3.5")

• int("3.5")

• str(10.5)

Answer explanation

The expression int("3.5") will result in a TypeError because it attempts to convert a string representing a float to an integer, which is not valid. The other expressions are valid conversions.