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UPSC Civil Services Coding-Decoding Questions with Answers & Explanations

20 Coding-Decoding questions from the Logical Reasoning & Analytical Ability section of UPSC Civil Services, each with the correct answer and a worked explanation. Try each question first, then tap Show answer to check. When you're ready, take the timed chapter-wise test to see your all-India rank.

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Question 1

In a certain code language, BRICK is written as ZPGAI. How is QUEEN written in that code?

  1. ASWGGP
  2. BMQAAJ
  3. CPTDDM
  4. DOSCCL
Show answer
Answer: (D) OSCCL Each letter is shifted 2 place(s) backward.
Question 2

In a certain code language, STONE is written as VWRQH. How is RIVER written in that code?

  1. AULYHU
  2. BOFSBO
  3. CXOBKX
  4. DUHYLU
Show answer
Answer: (A) ULYHU Each letter is shifted 3 place(s) forward.
Question 3

If BAT = 23 (sum of letter positions), then CAT = ?

  1. A25
  2. B21
  3. C24
  4. D28
Show answer
Answer: (C) 24 Add the alphabet positions of the letters: 3 + 1 + 20 = 24.
Question 4

In a certain code language, CLOUD is written as DMPVE. How is SMILE written in that code?

  1. AFMJNT
  2. BUOKNG
  3. CRLHKD
  4. DTNJMF
Show answer
Answer: (D) TNJMF Each letter is shifted 1 place(s) forward.
Question 5

If CUP = 40 (sum of letter positions), then HEN = ?

  1. A26
  2. B29
  3. C27
  4. D28
Show answer
Answer: (C) 27 Add the alphabet positions of the letters: 8 + 5 + 14 = 27.
Question 6

In a certain code language, TABLE is written as RYZJC. How is STONE written in that code?

  1. AUVQPG
  2. BOPKJA
  3. CQRMLC
  4. DRSNMD
Show answer
Answer: (C) QRMLC Each letter is shifted 2 place(s) backward.
Question 7

If HEN = 27 (sum of letter positions), then FAN = ?

  1. A23
  2. B19
  3. C21
  4. D25
Show answer
Answer: (C) 21 Add the alphabet positions of the letters: 6 + 1 + 14 = 21.
Question 8

In a certain code language, GLASS is written as FKZRR. How is PLANT written in that code?

  1. AQMBOU
  2. BOKZMS
  3. CSMZKO
  4. DNJYLR
Show answer
Answer: (B) OKZMS Each letter is shifted 1 place(s) backward.
Question 9

If FAN = 21 (sum of letter positions), then HEN = ?

  1. A25
  2. B29
  3. C31
  4. D27
Show answer
Answer: (D) 27 Add the alphabet positions of the letters: 8 + 5 + 14 = 27.
Question 10

In a certain code language, PLANT is written as SODQW. How is LIGHT written in that code?

  1. AOLJKW
  2. BIFDEQ
  3. CWKJLO
  4. DROMNZ
Show answer
Answer: (A) OLJKW Each letter is shifted 3 place(s) forward.

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Question 11

If MAP = 30 (sum of letter positions), then TOP = ?

  1. A51
  2. B49
  3. C50
  4. D53
Show answer
Answer: (A) 51 Add the alphabet positions of the letters: 20 + 15 + 16 = 51.
Question 12

In a certain code language, WATER is written as YCVGT. How is HOUSE written in that code?

  1. AKRXVH
  2. BGUWQJ
  3. CFMSQC
  4. DJQWUG
Show answer
Answer: (D) JQWUG Each letter is shifted 2 place(s) forward.
Question 13

If PEN = 35 (sum of letter positions), then TOP = ?

  1. A49
  2. B51
  3. C52
  4. D53
Show answer
Answer: (B) 51 Add the alphabet positions of the letters: 20 + 15 + 16 = 51.
Question 14

In a certain code language, HOUSE is written as JQWUG. How is STONE written in that code?

  1. AUVQPG
  2. BGPQVU
  3. CQRMLC
  4. DVWRQH
Show answer
Answer: (A) UVQPG Each letter is shifted 2 place(s) forward.
Question 15

If BUS = 42 (sum of letter positions), then COW = ?

  1. A38
  2. B43
  3. C41
  4. D42
Show answer
Answer: (C) 41 Add the alphabet positions of the letters: 3 + 15 + 23 = 41.
Question 16

In a certain code language, TABLE is written as RYZJC. How is WATER written in that code?

  1. APCRYU
  2. BYCVGT
  3. CVZSDQ
  4. DUYRCP
Show answer
Answer: (D) UYRCP Each letter is shifted 2 place(s) backward.
Question 17

If SUN = 54 (sum of letter positions), then BOX = ?

  1. A42
  2. B37
  3. C40
  4. D41
Show answer
Answer: (D) 41 Add the alphabet positions of the letters: 2 + 15 + 24 = 41.
Question 18

In a certain code language, TIGER is written as UJHFS. How is MONEY written in that code?

  1. AZFOPN
  2. BNPOFZ
  3. COQPGA
  4. DLNMDX
Show answer
Answer: (B) NPOFZ Each letter is shifted 1 place(s) forward.
Question 19

If CAT = 24 (sum of letter positions), then COW = ?

  1. A45
  2. B38
  3. C41
  4. D40
Show answer
Answer: (C) 41 Add the alphabet positions of the letters: 3 + 15 + 23 = 41.
Question 20

In a certain code language, CHAIR is written as DIBJS. How is TABLE written in that code?

  1. AUBCMF
  2. BSZAKD
  3. CVCDNG
  4. DFMCBU
Show answer
Answer: (A) UBCMF Each letter is shifted 1 place(s) forward.

These are RankerClub practice questions written in the UPSC Civil Services pattern. They are not official SSC/IBPS/RRB papers.

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