Practice

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

. Cannot start with numbers, symbols.

. Cannot be any keywords.

• 1variable

• @var

• my_var

• for

Answer explanation

Variable in Python must start with a letter or underscore and cannot be keywords. my_var is valid, while the others violate these rules.

What is the output of the following Python code?

print(type(3.14))

• int

• float

• str

• bool

Answer explanation

3.14 is a floating-point number in Python, and its type is float.

3. 3. What will be the output of this code?

x = 5

y = 10

print(x + y)

• 50

• 15

• error

• 5 + 10

Answer explanation

The + operator adds the two integers, 5 and 10, resulting in 15.

Which of the following is the correct way to declare a variable in Python?

• var x = 10

• x == 10

• x = 10

• None of the above

Answer explanation

Python uses = for variable assignment without needing a type declaration like in some other languages.

Which of the following is invalid?

• _a = 1

• __a = 1

• __str__ = 1

• none of the mentioned

Which of the following variable names is not valid in Python?

•    a) my_var

•    b) _myvar

•    c) 2myvar 

•    d) myVar2

What is the result of this arithmetic operation in Python?

10 // 3

• 3.33

• 3

• 4

• None of the above

Answer explanation

The // operator performs integer division, discarding the decimal part, so 10 // 3 results in 3.

Which function is used to get input from the user in Python?

• input()

• raw_input()

• • get_input()

• • print()

Answer explanation

The input() function is used to take user input as a string in Python.

What is the output of the following code?

print(5 < 10)

• True

• False

• None

• error

Answer explanation

The < operator checks if 5 is less than 10, which is true, so it prints True.

What is the result of the following expression in Python?

not (True and False)

• True

• False

• None

• Error

Answer explanation

True and False is False, and not False is True.