Python Boolean Truthiness & Logical Expressions Quiz

 1. What is the output of the following Python code?

x = [0]

print(bool(x))

A) True

B) False

C) 0

D) [0]

Answer: A) True

(A list containing elements, even 0, is non-empty and evaluates to True.)

2. What is the output of the following expression?

print([] or "Python")

A) []

B) False

C) "Python"

D) True

Answer: C) "Python"

(The or operator returns the first truthy operand, or the last operand if all are falsy.)

3. What does the following snippet print?

a = []

b = [1, 2]

print(a and b)

A) False

B) []

C) [1, 2]

D) None

Answer: B) []

(The and operator short-circuits on the first falsy value and returns the object itself, not a boolean.)

4. What is the evaluated output of this code?

x = [[]]

print(not x)

A) True

B) False

C) [[]]

D) Error

Answer: B) False

(x contains one element—an empty list—so x itself is non-empty and truthy. not x yields False.)

5. Which of the following expressions evaluates to True?

A) bool([])

B) bool("")

C) bool([False])

D) bool(0)

Answer: C) bool([False])

(A list with one element [False] has a length of 1, making it truthy.)

6. What does this code snippet print?

print(not [] == True)

A) True

B) False

C) None

D) SyntaxError

Answer: B) False

(Operator chaining applies here: not ([] == True). Since [] == True evaluates to False, the expression parses as not ([] == True) which produces False due to operator precedence where == binds tighter than not.)

7. What will be printed by the following expression?

print([1] and [] or [2])

A) [1]

B) []

C) [2]

D) True

Answer: C) [2]

([1] and [] evaluates to []. Then [] or [2] evaluates to [2].)

8. What is the output of the following condition?

items = []

result = "Non-empty" if items else "Empty"

print(result)

A) "Non-empty"

B) "Empty"

C) None

D) []

Answer: B) "Empty"

(An empty list evaluates to falsy in a ternary/conditional expression.)

9. What does the following comparison print?

print([] == False)

A) True

B) False

C) None

D) Error

Answer: B) False

(Falsiness does not mean equality. [] is a list, while False is a boolean; they are distinct objects with different types.)

10. What is the output of running this code?

x = []

print(not not x)

A) True

B) False

C) []

D) N

Answer: B) False

(not x evaluates to True, and the second not inverts it back to False.)