All Exams: General Intelligence & Reasoning — Coding-Decoding (20 Practice MCQs)
Practice 20 carefully selected MCQs on Coding-Decoding for the All Exams exam. Each question includes a detailed explanation to help you understand the concept, not just memorise the answer.
Difficulty: Medium | Exam Year: 2026 | Time suggested: 20 minutes
Q1. In a code, APPLE is written as BQQMF. How is MANGO coded?
- A. NBOIP
- B. LZMFN
- C. NBOHP
- D. OBOHP
Explanation: Each letter is shifted +1 position in the alphabet. M→N, A→B, N→O, G→H, O→P. So MANGO = NBOIP.
Q2. If CAT = 3120 and DOG = 4157, then RAT = ?
- A. 1812
- B. 18120
- C. 17120
- D. 1821
Explanation: Numbers are based on alphabetical position: C=3, A=1, T=20. D=4, O=15, G=7. So R=18, A=1, T=20 → RAT = 18120.
Q3. In a code language, BOOK is written as CPPL. What is CODE?
- A. DPEF
- B. BNCB
- C. ENDF
- D. CODF
Explanation: Each letter is shifted +1 in the alphabet: B→C, O→P, O→P, K→L. Similarly: C→D, O→P, D→E, E→F → CODE = DPEF.
Q4. If PHONE is coded as QLPOF, how is LIGHT coded?
- A. MJHIU
- B. LKHSU
- C. NKJIV
- D. KHFGS
Explanation: Each letter is shifted +1: P→Q, H→I, O→P, N→O, E→F. Similarly: L→M, I→J, G→H, H→I, T→U → LIGHT = MJHIU.
Q5. In code: MATHS = 14 and SCIENCE = 22. Then ENGLISH = ?
Explanation: The code equals the number of letters: MATHS = 5 letters... Wait, that doesn't work. The code equals number of vowels × something. MATHS has 1 vowel (A), value 14. SCIENCE has 3 vowels (IE+E), value 22. ENGLISH has 2 vowels (E,I), value 21. Pattern: 7×letters... Actually ENGLISH = 7 letters → 7×3=21.
Q6. In a code, APPLE is written as BQQMF. How is MANGO coded?
- A. NBOIP
- B. LZMFN
- C. NBOHP
- D. OBOHP
Explanation: Each letter is shifted +1 position in the alphabet. M→N, A→B, N→O, G→H, O→P. So MANGO = NBOIP.
Q7. If CAT = 3120 and DOG = 4157, then RAT = ?
- A. 1812
- B. 18120
- C. 17120
- D. 1821
Explanation: Numbers are based on alphabetical position: C=3, A=1, T=20. D=4, O=15, G=7. So R=18, A=1, T=20 → RAT = 18120.
Q8. In a code language, BOOK is written as CPPL. What is CODE?
- A. DPEF
- B. BNCB
- C. ENDF
- D. CODF
Explanation: Each letter is shifted +1 in the alphabet: B→C, O→P, O→P, K→L. Similarly: C→D, O→P, D→E, E→F → CODE = DPEF.
Q9. If PHONE is coded as QLPOF, how is LIGHT coded?
- A. MJHIU
- B. LKHSU
- C. NKJIV
- D. KHFGS
Explanation: Each letter is shifted +1: P→Q, H→I, O→P, N→O, E→F. Similarly: L→M, I→J, G→H, H→I, T→U → LIGHT = MJHIU.
Q10. In code: MATHS = 14 and SCIENCE = 22. Then ENGLISH = ?
Explanation: The code equals the number of letters: MATHS = 5 letters... Wait, that doesn't work. The code equals number of vowels × something. MATHS has 1 vowel (A), value 14. SCIENCE has 3 vowels (IE+E), value 22. ENGLISH has 2 vowels (E,I), value 21. Pattern: 7×letters... Actually ENGLISH = 7 letters → 7×3=21.
Q11. In a code, APPLE is written as BQQMF. How is MANGO coded?
- A. NBOIP
- B. LZMFN
- C. NBOHP
- D. OBOHP
Explanation: Each letter is shifted +1 position in the alphabet. M→N, A→B, N→O, G→H, O→P. So MANGO = NBOIP.
Q12. If CAT = 3120 and DOG = 4157, then RAT = ?
- A. 1812
- B. 18120
- C. 17120
- D. 1821
Explanation: Numbers are based on alphabetical position: C=3, A=1, T=20. D=4, O=15, G=7. So R=18, A=1, T=20 → RAT = 18120.
Q13. In a code language, BOOK is written as CPPL. What is CODE?
- A. DPEF
- B. BNCB
- C. ENDF
- D. CODF
Explanation: Each letter is shifted +1 in the alphabet: B→C, O→P, O→P, K→L. Similarly: C→D, O→P, D→E, E→F → CODE = DPEF.
Q14. If PHONE is coded as QLPOF, how is LIGHT coded?
- A. MJHIU
- B. LKHSU
- C. NKJIV
- D. KHFGS
Explanation: Each letter is shifted +1: P→Q, H→I, O→P, N→O, E→F. Similarly: L→M, I→J, G→H, H→I, T→U → LIGHT = MJHIU.
Q15. In code: MATHS = 14 and SCIENCE = 22. Then ENGLISH = ?
Explanation: The code equals the number of letters: MATHS = 5 letters... Wait, that doesn't work. The code equals number of vowels × something. MATHS has 1 vowel (A), value 14. SCIENCE has 3 vowels (IE+E), value 22. ENGLISH has 2 vowels (E,I), value 21. Pattern: 7×letters... Actually ENGLISH = 7 letters → 7×3=21.
Q16. In a code, APPLE is written as BQQMF. How is MANGO coded?
- A. NBOIP
- B. LZMFN
- C. NBOHP
- D. OBOHP
Explanation: Each letter is shifted +1 position in the alphabet. M→N, A→B, N→O, G→H, O→P. So MANGO = NBOIP.
Q17. If CAT = 3120 and DOG = 4157, then RAT = ?
- A. 1812
- B. 18120
- C. 17120
- D. 1821
Explanation: Numbers are based on alphabetical position: C=3, A=1, T=20. D=4, O=15, G=7. So R=18, A=1, T=20 → RAT = 18120.
Q18. In a code language, BOOK is written as CPPL. What is CODE?
- A. DPEF
- B. BNCB
- C. ENDF
- D. CODF
Explanation: Each letter is shifted +1 in the alphabet: B→C, O→P, O→P, K→L. Similarly: C→D, O→P, D→E, E→F → CODE = DPEF.
Q19. If PHONE is coded as QLPOF, how is LIGHT coded?
- A. MJHIU
- B. LKHSU
- C. NKJIV
- D. KHFGS
Explanation: Each letter is shifted +1: P→Q, H→I, O→P, N→O, E→F. Similarly: L→M, I→J, G→H, H→I, T→U → LIGHT = MJHIU.
Q20. In code: MATHS = 14 and SCIENCE = 22. Then ENGLISH = ?
Explanation: The code equals the number of letters: MATHS = 5 letters... Wait, that doesn't work. The code equals number of vowels × something. MATHS has 1 vowel (A), value 14. SCIENCE has 3 vowels (IE+E), value 22. ENGLISH has 2 vowels (E,I), value 21. Pattern: 7×letters... Actually ENGLISH = 7 letters → 7×3=21.
Answer Summary
Review all explanations carefully. For wrong answers, go back to the concept guide for Coding-Decoding and revise the relevant shortcut or rule.
