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15 Coding decoding Questions and Answers

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

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Practice coding decoding questions with detailed explanations. These solved examples cover the most frequently asked patterns in placement and competitive exams.

Q1 Easy

Using A=1, B=2 coding, 'TASK' is '2011911'. Find the code for 'BOOK'.

  • A. 1141410
  • B. 3161612
  • C. 2151511 ✓
  • D. BOOK
Explanation: Map A=1, B=2, ... Z=26 and concatenate.
Q2 Easy

Mirror alphabet rule gives 'BOOK' -> 'YLLP'. What is code for 'TASK'?

  • A. TASK
  • B. GZHP ✓
  • C. KSAT
  • D. UBTL
Explanation: Use mirror mapping A<->Z, B<->Y, ... for each letter.
Q3 Easy

If 'MIND' is coded as 'DNIM' (reverse order), how is 'CAT' coded?

  • A. TAC ✓
  • B. CAT
  • C. cat
  • D. ATC
Explanation: Rule is reverse the letter order.
Q4 Easy

Using alternating shifts on letters, 'CAT' becomes 'DZU'. Then 'TASK' becomes?

  • A. SZRJ
  • B. UBTL
  • C. UZTJ ✓
  • D. KSAT
Explanation: Apply +1 to 1st, -1 to 2nd, +1 to 3rd, and so on.
Q5 Easy

In a reverse coding rule, 'MIND' becomes 'DNIM'. Find code for 'TASK'.

  • A. task
  • B. TASK
  • C. KSAT ✓
  • D. ASKT
Explanation: Rule is reverse the letter order.
Q6 Easy

Using a +1 alphabet shift, 'BOOK' becomes 'CPPL'. What is code for 'ROAD'?

  • A. DAOR
  • B. ROAD
  • C. SPBE ✓
  • D. TQCF
Explanation: Apply same +1 shift to each letter of 'ROAD'.
Q7 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'.
Q8 Medium

If 'BOOK' is coded as 'KOOB' (reverse order), how is 'ROAD' coded?

  • A. OADR
  • B. road
  • C. ROAD
  • D. DAOR ✓
Explanation: Rule is reverse the letter order.
Q9 Medium

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

  • A. CPPL
  • B. KOOB
  • C. BOOK
  • D. YLLP ✓
Explanation: Use mirror mapping A<->Z, B<->Y, ... for each letter.
Q10 Medium

If 'MIND' is coded as 'PLQG' (shift +3), how is 'ROAD' coded?

  • A. VSEH
  • B. URDG ✓
  • C. DAOR
  • D. TQCF
Explanation: Apply same +3 shift to each letter of 'ROAD'.
Q11 Medium

A +3 shift code converts a word into 'ERRN'. Which original word could it be?

  • A. YLLH
  • B. FSSO
  • C. KOOB
  • D. BOOK ✓
Explanation: Reversing the +3 shift on 'ERRN' gives 'BOOK'.
Q12 Hard

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

  • A. 4221
  • B. 3120 ✓
  • C. CAT
  • D. 2019
Explanation: Map A=1, B=2, ... Z=26 and concatenate.
Q13 Hard

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

  • A. TASK
  • B. UBTL
  • C. GZHP ✓
  • D. KSAT
Explanation: Use mirror mapping A<->Z, B<->Y, ... for each letter.
Q14 Hard

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

  • A. SPBE
  • B. DAOR
  • C. SNBC ✓
  • D. QNZC
Explanation: Apply +1 to 1st, -1 to 2nd, +1 to 3rd, and so on.
Q15 Hard

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

  • A. XZG ✓
  • B. DBU
  • C. TAC
  • D. CAT
Explanation: Use mirror mapping A<->Z, B<->Y, ... for each letter.

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