If ZERO is encoded as ADSN, then how do you encode STOP?

Mental Ability & Logical Reasoning ·Previously asked in UPSC Civil Services Examination 2026

View the full solved paper: GS Paper II

Question

If ZERO is encoded as ADSN, then how do you encode STOP?

  1. A. SPOT
  2. B. TSPO (Correct answer)
  3. C. TSOP
  4. D. POST

Correct Answer

Option B — TSPO

Detailed Solution & Explanation

The correct answer is Option B (TSPO).

Key Points

  • ZERO → ADSN uses an alternating shift +1, −1, +1, −1: Z+1=A, E−1=D, R+1=S, O−1=N.
  • Apply the same to STOP: S+1=T, T−1=S, O+1=P, P−1=OTSPO.

Additional Information

  • Spotting the alternating forward/backward shift is the trick; it gives Option B.