UPSC CSE Prelims
Coding-Decoding Previous Year Questions (PYQs)
Practice solved questions for Coding-Decoding with detailed step-by-step solutions, key insights, and trend analysis for UPSC CSE PRELIMS.
Solved Previous Year Questions
Filter & practice questions topic-wise
If ZERO is encoded as ADSN, then how do you encode STOP?
Detailed Explanation:
In the encoding pattern, ZERO → ADSN reveals an alternating shift: 1st and 3rd letters shift forward (+1) in the alphabet, while 2nd and 4th letters shift backward (−1). Verify: Z→A(+1), E→D(−1), R→S(+1), O→N(−1).
Applying this pattern to STOP: S→T(+1), T→S(−1), O→P(+1), P→O(−1), yielding TSPO.
Therefore, the encoded form is TSPO, making Option 2 the correct answer.
🧐 Not Sure What to Study Next?
Get a personalised study plan based on your goals, time and revision needs.
Related Topics in CSAT (Civil Services Aptitude Test)
Frequently Asked Questions
Common questions about Coding-Decoding in UPSC CSE PRELIMS