Python Flow Control ( If Else and Loops) Quiz

1. Given the nested if-else structure below, what will be the value of x

x = 0
a = 0
b = -5
if a > 0:
    if b < 0: 
        x = x + 5 
    elif a > 5:
        x = x + 4
    else:
        x = x + 3
else:
    x = x + 2
print(x)

2. What is the output of the following loop

for i in 'Jhon':
   if i == 'o':
      pass
   print(i, end=", ")

3. What will be the output of the following Python code?

count = 0
while count < 5:
    print(count)
    if count == 2:
        break
    count += 1
else:
    print("Loop completed")

4. What will be the output of the following Python code?

result = 0 
for i in range(4): 
  if i % 2 == 0: 
    result += 1 
  else: 
    result -= 1 
print(result)

5. What kind of error is most likely to occur if you incorrectly indent a line of code within an if block?

6. What is the purpose of the else block in a for loop?

7. What will be the output of the following Python code?

for i in range(3):
  print(i * 2, end=" ")

8. What is the output of the following nested loop?

numbers = [10, 20]
items = ["Chair", "Table"]

for x in numbers:
  for y in items:
    print(x, y)

9. When you iterate directly over a dictionary using a for loop (e.g., for key in my_dict:), what do you get in each iteration?

10. Given the nested if-else below, what will be the value x

x = 0
a = 5
b = 5
if a > 0:
    if b < 0: 
        x = x + 5 
    elif a > 5:
        x = x + 4
    else:
        x = x + 3
else:
    x = x + 2
print(x)

11. In the expression condition1 and condition2, when is condition2 evaluated?

12. Which list comprehension correctly filters a list numbers to include only even numbers?

13. if -3 will evaluate to True

14. Which of the following correctly describes a while loop?

15. What will be the output of the following Python code?

data = ["apple", "banana", "cherry"]
for index, item in enumerate(data):
    print(f"{index}: {item}")

16. What is the output of the following range() function

for num in range(2,-5,-1):
    print(num, end=", ")

17. Which of the following conditions would most likely result in an infinite while loop?

18. Which keyword is used to skip the rest of the current iteration of a loop and move to the next iteration?

19. What is the value of x

x = 0
while x < 10:
  x+=2
print(x)

20. How many times will the print statement be executed in the following code?

for i in range(10): 
  if i == 5: 
    break 
  print(i)

21. What will be the output of the following Python code?

x = 1 
while x <= 3: 
  print(x * '*', end=' ')
  x += 1

22. What will be the output of the following Python code?

matrix = [[1, 2], [3, 4]]
for row in matrix:
    for item in row:
        print(item, end=" ")
print()

23. When is the else block of a while loop executed?

24. Which of these is NOT a valid control flow statement in Python?

25. What will be the output of the following Python code?

for i in range(3):
    if i == 1:
        continue
    print(i)
else:
    print("Loop finished")