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25 Coding decoding Questions and Answers

25 solved Coding decoding questions with step-by-step explanations. Includes formulas, shortcuts, and tips for placement tests and competitive exams.

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Advanced coding decoding questions for experienced learners. These medium-to-hard questions test deeper understanding and are ideal for those who have already mastered the basics. Each question includes a detailed explanation.

Q1 Medium

A +2 shift code converts a word into 'OKPF'. Which original word could it be?

  • A. DNIM
  • B. KGLB
  • C. PLQG
  • D. MIND ✓
Explanation: Reversing the +2 shift on 'OKPF' gives 'MIND'.
Q2 Medium

If letter positions are used as code and 'TASK' becomes '2011911', what is code for 'ROAD'?

  • A. 191625
  • B. ROAD
  • C. 181514 ✓
  • D. 171403
Explanation: Map A=1, B=2, ... Z=26 and concatenate.
Q3 Medium

A +1 shift code converts a word into 'SPBE'. Which original word could it be?

  • A. QNZC
  • B. DAOR
  • C. ROAD ✓
  • D. TQCF
Explanation: Reversing the +1 shift on 'SPBE' gives 'ROAD'.
Q4 Medium

Using a +3 alphabet shift, 'MIND' becomes 'PLQG'. What is code for 'ROAD'?

  • A. URDG ✓
  • B. TQCF
  • C. DAOR
  • D. VSEH
Explanation: Apply same +3 shift to each letter of 'ROAD'.
Q5 Medium

A +1 shift code converts a word into 'CPPL'. Which original word could it be?

  • A. BOOK ✓
  • B. DQQM
  • C. ANNJ
  • D. KOOB
Explanation: Reversing the +1 shift on 'CPPL' gives 'BOOK'.
Q6 Medium

Letters are written in reverse: 'CAT' -> 'TAC'. Then 'BOOK' -> ?

  • A. KOOB ✓
  • B. book
  • C. OOKB
  • D. BOOK
Explanation: Rule is reverse the letter order.
Q7 Medium

If 'BOOK' is coded as 'YLLP' using opposite alphabet positions (A<->Z), how is 'TASK' coded?

  • A. KSAT
  • B. GZHP ✓
  • C. UBTL
  • D. TASK
Explanation: Use mirror mapping A<->Z, B<->Y, ... for each letter.
Q8 Medium

Using alternating shifts on letters, 'ROAD' becomes 'SNBC'. Then 'TASK' becomes?

  • A. UZTJ ✓
  • B. SZRJ
  • C. KSAT
  • D. UBTL
Explanation: Apply +1 to 1st, -1 to 2nd, +1 to 3rd, and so on.
Q9 Medium

Using a +3 alphabet shift, 'BOOK' becomes 'ERRN'. What is code for 'TASK'?

  • A. XEWO
  • B. KSAT
  • C. VCUM
  • D. WDVN ✓
Explanation: Apply same +3 shift to each letter of 'TASK'.
Q10 Medium

Letters are written in reverse: 'BOOK' -> 'KOOB'. Then 'TASK' -> ?

  • A. task
  • B. KSAT ✓
  • C. ASKT
  • D. TASK
Explanation: Rule is reverse the letter order.
Q11 Medium

A +2 shift code converts a word into 'DQQM'. Which original word could it be?

  • A. BOOK ✓
  • B. ERRN
  • C. ZMMI
  • D. KOOB
Explanation: Reversing the +2 shift on 'DQQM' gives 'BOOK'.
Q12 Medium

Using a +3 alphabet shift, 'TASK' becomes 'WDVN'. What is code for 'BOOK'?

  • A. DQQM
  • B. FSSO
  • C. ERRN ✓
  • D. KOOB
Explanation: Apply same +3 shift to each letter of 'BOOK'.
Q13 Medium

Using A<->Z, B<->Y mapping, 'MIND' becomes 'NRMW'. Then 'ROAD' becomes?

  • A. ROAD
  • B. SPBE
  • C. ILZW ✓
  • D. DAOR
Explanation: Use mirror mapping A<->Z, B<->Y, ... for each letter.
Q14 Medium

Using a +2 alphabet shift, 'CAT' becomes 'ECV'. What is code for 'MIND'?

  • A. OKPF ✓
  • B. PLQG
  • C. DNIM
  • D. NJOE
Explanation: Apply same +2 shift to each letter of 'MIND'.
Q15 Medium

Using A<->Z, B<->Y mapping, 'TASK' becomes 'GZHP'. Then 'ROAD' becomes?

  • A. DAOR
  • B. ROAD
  • C. ILZW ✓
  • D. SPBE
Explanation: Use mirror mapping A<->Z, B<->Y, ... for each letter.
Q16 Medium

A +2 shift code converts a word into 'VCUM'. Which original word could it be?

  • A. TASK ✓
  • B. RYQI
  • C. WDVN
  • D. KSAT
Explanation: Reversing the +2 shift on 'VCUM' gives 'TASK'.
Q17 Medium

If 'CAT' is coded as 'FDW' (shift +3), how is 'ROAD' coded?

  • A. TQCF
  • B. URDG ✓
  • C. VSEH
  • D. DAOR
Explanation: Apply same +3 shift to each letter of 'ROAD'.
Q18 Medium

If letter positions are used as code and 'ROAD' becomes '181514', what is code for 'MIND'?

  • A. 139144 ✓
  • B. 128133
  • C. 1410155
  • D. MIND
Explanation: Map A=1, B=2, ... Z=26 and concatenate.
Q19 Medium

If letters in 'CAT' are coded as 'DZU' by applying +1, -1 alternately, how is 'TASK' coded?

  • A. KSAT
  • B. UBTL
  • C. SZRJ
  • D. UZTJ ✓
Explanation: Apply +1 to 1st, -1 to 2nd, +1 to 3rd, and so on.
Q20 Medium

Using a +2 alphabet shift, 'BOOK' becomes 'DQQM'. What is code for 'CAT'?

  • A. ECV ✓
  • B. DBU
  • C. TAC
  • D. FDW
Explanation: Apply same +2 shift to each letter of 'CAT'.
Q21 Medium

Using A<->Z, B<->Y mapping, 'CAT' becomes 'XZG'. Then 'ROAD' becomes?

  • A. ILZW ✓
  • B. SPBE
  • C. DAOR
  • D. ROAD
Explanation: Use mirror mapping A<->Z, B<->Y, ... for each letter.
Q22 Medium

Alphabet position code maps 'BOOK' -> '2151511'. Then 'TASK' maps to?

  • A. TASK
  • B. 2011911 ✓
  • C. 2122012
  • D. 1901810
Explanation: Map A=1, B=2, ... Z=26 and concatenate.
Q23 Medium

A +1 shift code converts a word into 'DBU'. Which original word could it be?

  • A. TAC
  • B. BZS
  • C. CAT ✓
  • D. ECV
Explanation: Reversing the +1 shift on 'DBU' gives 'CAT'.
Q24 Medium

If letter positions are used as code and 'MIND' becomes '139144', what is code for 'TASK'?

  • A. 2011911 ✓
  • B. 1901810
  • C. 2122012
  • D. TASK
Explanation: Map A=1, B=2, ... Z=26 and concatenate.
Q25 Medium

If 'BOOK' is coded as 'ERRN' (shift +3), how is 'CAT' coded?

  • A. FDW ✓
  • B. ECV
  • C. GEX
  • D. TAC
Explanation: Apply same +3 shift to each letter of 'CAT'.

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