Constable GD 2026 — General Intelligence & Reasoning: Coding-Decoding (20 Practice MCQs)

Practise these 20 MCQs on Coding-Decoding for Constable GD 2026. Each question includes a detailed explanation.

Difficulty: Medium | Subject: General Intelligence & Reasoning | Topic: Coding-Decoding

Q1. If CAT = 3-1-20, then DOG = ?

  • A. 4-15-7
  • B. 4-14-7
  • C. 3-15-7
  • D. 4-15-8
Answer: A — D=4, O=15, G=7 → 4-15-7.

Q2. If SUN is coded as 19-21-14, then MOON = ?

  • A. 13-15-15-14
  • B. 12-15-15-13
  • C. 13-14-15-14
  • D. 13-15-14-14
Answer: A — M=13, O=15, O=15, N=14 → 13-15-15-14.

Q3. If RAIN is written as SBJO, then SNOW = ?

  • A. TOPX
  • B. TNPX
  • C. TOQX
  • D. SOPX
Answer: A — +1 shift: S→T, N→O, O→P, W→X → TOPX.

Q4. If TABLE = UBCMF, then CHAIR = ?

  • A. DIBJS
  • B. DIBIS
  • C. DIJBS
  • D. DICJS
Answer: A — +1 shift: C→D, H→I, A→B, I→J, R→S → DIBJS.

Q5. If COLD = DPME, then HOT = ?

  • A. IPU
  • B. IQU
  • C. HPU
  • D. IOT
Answer: A — +1 shift: H→I, O→P, T→U → IPU.

Q6. If BLUE = 2-12-21-5, then RED = ?

  • A. 18-5-4
  • B. 17-5-4
  • C. 18-4-4
  • D. 18-5-3
Answer: A — R=18, E=5, D=4 → 18-5-4.

Q7. If FISH = GJTJ, then BIRD = ?

  • A. CJSE
  • B. DJSE
  • C. CISE
  • D. CJSF
Answer: A — +1 shift: B→C, I→J, R→S, D→E → CJSE.

Q8. If STAR = UVCT, then MOON = ?

  • A. OQQP
  • B. OQPQ
  • C. PQQO
  • D. OPQQ
Answer: A — +2 shift: M→O, O→Q, O→Q, N→P → OQQP.

Q9. If PEN = 16-5-14, then INK = ?

  • A. 9-14-11
  • B. 9-13-11
  • C. 8-14-11
  • D. 9-14-10
Answer: A — I=9, N=14, K=11 → 9-14-11.

Q10. If WATER = YCVGT, then FIRE = ?

  • A. HKTG
  • B. HJSG
  • C. HKTF
  • D. GKTG
Answer: A — +2 shift: F→H, I→K, R→T, E→G → HKTG.

Q11. If APPLE = BQQMF, then MANGO = ?

  • A. NBOHP
  • B. NBNHP
  • C. NBOIP
  • D. NANHP
Answer: A — +1 shift: M→N, A→B, N→O, G→H, O→P → NBOHP.

Q12. If COW = 3-15-23, then PIG = ?

  • A. 16-9-7
  • B. 16-8-7
  • C. 15-9-7
  • D. 16-9-8
Answer: A — P=16, I=9, G=7 → 16-9-7.

Q13. If ROSE = 18-15-19-5, then LILY = ?

  • A. 12-9-12-25
  • B. 11-9-12-25
  • C. 12-9-11-25
  • D. 12-8-12-25
Answer: A — L=12, I=9, L=12, Y=25 → 12-9-12-25.

Q14. In a code FOREST = FOPSET. How is JUNGLE coded?

  • A. JUGNLE
  • B. JUNLGE
  • C. JUNGEL
  • D. JUGNEL
Answer: A — Middle two letters swapped: NG swapped → JUGNLE.

Q15. If BOOK = 2-15-15-11, then COPY = ?

  • A. 3-15-16-25
  • B. 3-14-16-25
  • C. 3-15-16-24
  • D. 2-15-16-25
Answer: A — C=3, O=15, P=16, Y=25 → 3-15-16-25.

Q16. If TIGER = UJIFS, then HORSE = ?

  • A. IPSFT
  • B. IORST
  • C. IPRST
  • D. IPSET
Answer: A — +1: H→I, O→P, R→S, S→T, E→F → IPSFT.

Q17. If WATCH = XBUDI, then CLOCK = ?

  • A. DNPDL
  • B. DMPCL
  • C. DNPCL
  • D. DLPDM
Answer: A — +1: C→D, L→M, O→P... C=D, L=M, O=P, C=D, K=L → DNPDL.

Q18. If KING = 11-9-14-7, then QUEEN = ?

  • A. 17-21-5-5-14
  • B. 16-21-5-5-14
  • C. 17-20-5-5-14
  • D. 17-21-4-5-14
Answer: A — Q=17, U=21, E=5, E=5, N=14 → 17-21-5-5-14.

Q19. If A=2, B=3, C=4... (each letter = position+1), then CAB = ?

  • A. 432
  • B. 312
  • C. 421
  • D. 342
Answer: A — C=4, A=2, B=3 → 432.

Q20. If MANGO = NBOHP, then PAPAYA = ?

  • A. QBQBZB
  • B. QAQAZB
  • C. PBQBZB
  • D. QBQBYB
Answer: A — +1 shift: P→Q, A→B, P→Q, A→B, Y→Z, A→B → QBQBZB.

Quick Tips for Coding-Decoding

  • Practise at least 20 questions daily.
  • Aim for under 60 seconds per question.
  • Revisit wrong answers to fix concepts.