Day 23 – Python: Loops & Iterations – ECET 2026 CSE

In ECET 2026 CSE, Python programming is one of the most important sections. Among them, loops & iterations are repeatedly asked. If you master this, you can easily answer coding-based MCQs and logic-building questions.

📘 Concept Notes

🔹 Types of Loops in Python

1. for loop – Iterates over a sequence (list, tuple, string, range).

for i in range(5):
    print(i)

for i in range(5):
    print(i)

1. while loop – Runs as long as a condition is true.

i = 1
while i <= 5:
    print(i)
    i += 1

i = 1
while i <= 5:
    print(i)
    i += 1

1. Nested loops – Loop inside another loop.
2. Loop control statements:
   • break → Exits the loop immediately.
   • continue → Skips the current iteration, continues next.
   • pass → Does nothing (placeholder).

⚙️ Formulas

👉 Python lo loops ki mathematical representation:

🔟 10 Most Expected MCQs – Python Loops & Iterations

Q1. Which loop in Python is used to iterate over a sequence?
A) while
B) for
C) do-while
D) repeat

Q2. What does the range(5) function return?
A) 1 to 5
B) 0 to 5
C) 0 to 4
D) None

Q3. Output of the code?

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

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

A) 0 1 2
B) 1 2 3
C) 0 1 2 3
D) Error

Q4. Which loop may not execute even once?
A) for
B) while
C) nested
D) both for & while

Q5. What keyword is used to stop a loop immediately?
A) pass
B) exit
C) break
D) continue

Q6. What keyword skips the current iteration?
A) break
B) pass
C) stop
D) continue

Q7. Output of the code?

i = 1
while i < 4:
    print(i, end=" ")
    i += 1

i = 1
while i < 4:
    print(i, end=" ")
    i += 1

A) 0 1 2
B) 1 2 3
C) 1 2 3 4
D) Infinite loop

Q8. Which loop is best for fixed iterations?
A) for
B) while
C) nested
D) recursion

Q9. The statement pass in a loop means?
A) terminate
B) skip iteration
C) placeholder / do nothing
D) infinite loop

Q10. Which loop is more suitable when the number of iterations is not known?
A) for
B) while
C) both
D) none

✅ Answer Key

🧠 Explanations

• Q1 → B: for loop is used to iterate over sequences.
• Q2 → C: range(5) → [0,1,2,3,4].
• Q3 → A: Prints 0 1 2.
• Q4 → B: while may not execute if condition is false at start.
• Q5 → C: break terminates loop.
• Q6 → D: continue skips current iteration.
• Q7 → B: Prints 1 2 3.
• Q8 → A: for is best when iterations are fixed.
• Q9 → C: pass is a placeholder (does nothing).
• Q10 → B: while is best when iterations are unknown.

🎯 Why Practice Matters

• Loops are the foundation of coding.
• Every ECET paper asks at least 1–2 MCQs on loops.
• Mastering loops helps in pattern problems, data structures, and real coding interviews.

💪 Motivation Talk

“Every loop you practice builds your logic stronger.” 💡
Don’t skip basics – they are your building blocks for advanced coding. 🚀

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