Python's if...else statement is a fundamental control flow tool that allows you to execute code based on certain conditions. Here we present 12 multiple-choice questions to test your knowledge of Python if-else statement. Each MCQ has the correct answer with an explanation.
1. What is the correct syntax for an if statement in Python?
a) if (x > 10) { }
b) if x > 10:
c) if x > 10 then:
d) if (x > 10):
Answer:
b) if x > 10:
Explanation:
In Python, the syntax for an if statement is 'if' followed by the condition, a colon, and then the block of code to execute if the condition is true.
2. How do you check for multiple conditions in a single if statement?
a) if x > 10 and y < 5:
b) if x > 10 && y < 5:
c) if (x > 10) && (y < 5):
d) if x > 10 & y < 5:
Answer:
a) if x > 10 and y < 5:
Explanation:
Python uses 'and' to check if multiple conditions are true.
3. How would you write an if statement that executes when x is not equal to 10?
a) if x != 10:
b) if x =! 10:
c) if x <> 10:
d) if x not 10:
Answer:
a) if x != 10:
Explanation:
The '!=' operator is used in Python to check if two values are not equal.
4. Which keyword is used for executing a block of code if the if condition is false?
a) else
b) otherwise
c) elif
d) except
Answer:
a) else
Explanation:
The 'else' keyword is used in Python to execute a block of code when the if condition is false.
5. How do you implement multiple conditions that trigger different blocks of code?
a) if ... elif ... else
b) if ... else if ... else
c) if ... then ... else
d) if ... or ... else
Answer:
a) if ... elif ... else
Explanation:
Python uses 'elif', short for 'else if', for multiple, mutually exclusive conditions in an if statement.
6. What is the output of the following code?
x = 10
if x > 10:
print("Greater")
elif x == 10:
print("Equal")
else:
print("Lesser")
a) Greater
b) Equal
c) Lesser
d) No output
Answer:
b) Equal
Explanation:
The code checks if x is greater than, equal to, or less than 10. Since x is 10, it prints "Equal".
7. How do you write a one-line if statement in Python?
a) if x > 10: print(x)
b) print(x) if x > 10
c) print(x) where x > 10
d) (print x) if x > 10
Answer:
b) print(x) if x > 10
Explanation:
Python allows one-line if statements, where the action is before the condition, separated by 'if'.
8. What is the correct way to check if a list is empty in an if statement?
a) if len(my_list) == 0:
b) if my_list == []:
c) if not my_list:
d) All of the above
Answer:
d) All of the above
Explanation:
All three methods are correct for checking if a list is empty in Python.
9. Can an if statement contain only an else clause without elif?
a) Yes
b) No
c) Only inside a function
d) Only if there is no code in the else clause
Answer:
a) Yes
Explanation:
An if statement can have an else clause without an elif, as elif is optional.
10. What is the result of the following code?
x = 5
if x > 10:
print("A")
else:
if x > 7:
print("B")
else:
print("C")
a) A
b) B
c) C
d) No output
Answer:
c) C
Explanation:
The code uses nested if statements. Since x is 5, which is not greater than 10 or 7, it prints "C".
11. Which keyword allows you to check if a condition is false in an if statement?
a) not
b) false
c) invert
d) negate
Answer:
a) not
Explanation:
The 'not' keyword is used to check if a condition is false in Python.
12. How do you check for the existence of a key in a dictionary within an if statement?
a) if my_dict.has_key('key'):
b) if 'key' in my_dict:
c) if my_dict['key']:
d) if my_dict.exists('key'):
Answer:
b) if 'key' in my_dict:
Explanation:
The syntax 'if key in dictionary:' is used to check if a key exists in a dictionary.
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