MCQs on Control Structures | Python programming

1. Conditional Statements (if, else, elif)

1. Which of the following is the correct syntax for an if-else statement in Python?
   • a) if condition: else
   • b) if condition: elif: else
   • c) if condition else:
   • d) if condition: else condition
2. What will be the output of the following code?
   x = 10 if x > 5: print("Greater") else: print("Smaller")
   • a) Greater
   • b) Smaller
   • c) Error
   • d) None
3. How many elif statements can be used in a Python conditional structure?
   • a) One
   • b) Unlimited
   • c) Two
   • d) Zero
4. What is the output of the following code?
   x = 5 if x > 10: print("Greater") elif x == 5: print("Equal") else: print("Smaller")
   • a) Greater
   • b) Equal
   • c) Smaller
   • d) Error
5. What is the purpose of the else block in a conditional statement?
   • a) To execute code if the condition is false
   • b) To execute code when a condition is true
   • c) To end the program
   • d) To handle exceptions

2. Loops: for, while

6. Which loop will execute a block of code a fixed number of times?
   • a) for loop
   • b) while loop
   • c) do-while loop
   • d) loop()
7. What is the correct syntax for a for loop in Python?
   • a) for x in range():
   • b) for x in range(1, 10):
   • c) for x;
   • d) for (x = 0; x < 10; x++)
8. What will the following code print?
   for i in range(3): print(i)
   • a) 0 1 2
   • b) 1 2 3
   • c) 0 1 2 3
   • d) Error
9. What is the result of the following code?pythonCopy codex = 0 while x < 3: print(x) x += 1
   • a) 0 1 2
   • b) 0 1 2 3
   • c) 1 2 3
   • d) Error
10. Which of the following will create an infinite loop in Python?
    • a) while True:
    • b) for x in range(1, 10):
    • c) while x < 10:
    • d) for x in range(10):

3. Break, Continue, and Pass Statements

11. What does the break statement do in a loop?
    • a) Terminates the loop
    • b) Skips to the next iteration
    • c) Exits the current function
    • d) Pauses the loop
12. What is the purpose of the continue statement in a loop?
    • a) Skips to the next iteration of the loop
    • b) Exits the loop immediately
    • c) Pauses the loop
    • d) Ends the loop
13. What does the pass statement do in Python?
    • a) Skips the rest of the loop and proceeds to the next iteration
    • b) Terminates the loop
    • c) Does nothing, acts as a placeholder
    • d) Exits the program
14. What will the following code print?
    for i in range(3): if i == 1: break print(i)
    • a) 0
    • b) 0 1
    • c) 0 1 2
    • d) Error
15. What will the following code print?pythonCopy codefor i in range(3): if i == 1: continue print(i)
    • a) 0 1 2
    • b) 0 2
    • c) 1 2
    • d) Error

4. Nested Loops and Conditions

16. Which of the following represents a nested for loop in Python?
    • a)
    pythonCopy codefor i in range(3): for j in range(3): print(i, j)
    • b)
    pythonCopy codefor i in range(3): if i == 1: for j in range(3): print(i, j)
    • c)
    pythonCopy codefor i in range(3): while i < 3: print(i)
    • d) None of the above
17. How many times will the inner print statement execute in the following code?
    for i in range(2): for j in range(3): print(i, j)
    • a) 2
    • b) 3
    • c) 6
    • d) 5
18. What will the following code output?
    for i in range(2): for j in range(2): if i == 1 and j == 1: break print(i, j)
    • a) 0 0 0 1 1 0
    • b) 0 0 0 1
    • c) 0 0 0 1 1 1
    • d) 0 0 0 1
19. What is the result of the following code?
    for i in range(2): for j in range(2): if i == j: pass else: print(i, j)
    • a) 0 1 1 0
    • b) 1 0
    • c) 0 1 1 1
    • d) 0 1
20. What is the outcome of the following code?
    for i in range(3): for j in range(3): if j == 1: break print(i, j)
    • a) 0 0 1 0
    • b) 0 0 1 1
    • c) 0 0
    • d) 1 0

5. List Comprehensions

21. Which of the following is the correct syntax for a list comprehension?
    • a) [x for x in range(5)]
    • b) for x in range(5): [x]
    • c) x = [for x in range(5)]
    • d) list comprehension: [x for x in range(5)]
22. What does the following list comprehension return?
    [x * 2 for x in range(3)]
    • a) [0, 1, 2]
    • b) [0, 2, 4]
    • c) [0, 2, 4, 6]
    • d) [2, 4, 6]
23. What will this list comprehension return?
    [x for x in range(5) if x % 2 == 0]
    • a) [1, 3]
    • b) [0, 2, 4]
    • c) [1, 2, 3, 4]
    • d) [0, 1, 2]
24. What is the output of the following code?
    [x ** 2 for x in range(3)]
    • a) [1, 4, 9]
    • b) [1, 2, 3]
    • c) [0, 1, 2]
    • d) [0, 1, 4]
25. Which of the following will create a list of even numbers between 1 and 10 (inclusive)?
    • a) [x for x in range(1, 11) if x % 2 == 0]
    • b) [x for x in range(1, 10) if x % 2 != 0]
    • c) [x for x in range(0, 10) if x % 2 != 0]
    • d) [x for x in range(10) if x % 2 == 0]
26. How do you create a list of squares of numbers from 0 to 4 using list comprehension?
    • a) [x * x for x in range(5)]
    • b) [x ** 2 for x in range(4)]
    • c) [x^2 for x in range(5)]
    • d) [x for x in range(5)]
27. What will be the output of the following list comprehension?
    [x + 1 for x in range(5) if x % 2 == 0]
    • a) [2, 4]
    • b) [1, 3, 5]
    • c) [1, 3]
    • d) [0, 2, 4]
28. Which of the following is the correct syntax for a nested list comprehension?
    • a) [x for x in range(3) for y in range(3)]
    • b) [x, y for x in range(3) for y in range(3)]
    • c) [[x, y] for x in range(3) for y in range(3)]
    • d) [[x] for x in range(3) for y in range(3)]
29. What is the output of this code?pythonCopy code[[x * y for x in range(2)] for y in range(2)]
    • a) [[0, 0], [0, 1]]
    • b) [[0, 0], [0, 2]]
    • c) [[0, 1], [0, 2]]
    • d) [[0, 2], [0, 1]]
30. What does this list comprehension do?pythonCopy code[x for x in range(5) if x % 2 == 1]
    • a) Generates a list of odd numbers between 1 and 5
    • b) Generates a list of even numbers between 1 and 5
    • c) Generates a list of prime numbers between 1 and 5
    • d) Generates a list of all numbers between 1 and 5

Answers (Tabular Form)