CHSL 2026 — General Intelligence & Reasoning: Coding-Decoding Concept Guide + 10 MCQs
Master Coding-Decoding for CHSL 2026. This guide covers theory, shortcuts, and 10 practice MCQs.
Concept: Coding-Decoding
Coding-Decoding finds patterns that encode words. Common types: letter shifting (+1, +2, -1), number coding (A=1), reverse alphabet (A=26), letter reversal.
Steps
- Check shift for 2-3 letters
- Try number coding (A=1 to Z=26)
- Try reverse: 27-position
⚡ Shortcuts & Tricks
- Write A=1...Z=26 on rough paper
- Verify pattern on all letters
- Consider alternating shifts if simple doesn't work
Practice MCQs (10 Questions)
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.
Summary
Code-decoding needs pattern identification. Check letter shift, number codes, and reversals systematically.
