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GATE Coding-Decoding Questions with Answers & Explanations

16 Coding-Decoding questions from the General Aptitude (Quantitative & Reasoning) section of GATE, 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, HOUSE is written as IPVTF. How is RIVER written in that code?

  1. ASJWFS
  2. BQHUDQ
  3. CSFWJS
  4. DTKXGT
Show answer
Answer: (A) SJWFS Each letter is shifted 1 place(s) forward.
Question 2

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

  1. A34
  2. B30
  3. C29
  4. D27
Show answer
Answer: (B) 30 Add the alphabet positions of the letters: 13 + 1 + 16 = 30.
Question 3

In a certain code language, STONE is written as RSNMD. How is FRUIT written in that code?

  1. ASHTQE
  2. BFRUIT
  3. CEQTHS
  4. DGSVJU
Show answer
Answer: (C) EQTHS Each letter is shifted 1 place(s) backward.
Question 4

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

  1. A45
  2. B41
  3. C40
  4. D42
Show answer
Answer: (D) 42 Add the alphabet positions of the letters: 2 + 21 + 19 = 42.
Question 5

In a certain code language, CLOUD is written as ENQWF. How is TRAIN written in that code?

  1. AWUDLQ
  2. BVTCKP
  3. CRPYGL
  4. DPKCTV
Show answer
Answer: (B) VTCKP Each letter is shifted 2 place(s) forward.
Question 6

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

  1. A28
  2. B27
  3. C23
  4. D26
Show answer
Answer: (B) 27 Add the alphabet positions of the letters: 8 + 5 + 14 = 27.
Question 7

In a certain code language, HOUSE is written as FMSQC. How is CLOUD written in that code?

  1. AAJMSB
  2. BYHKQZ
  3. CENQWF
  4. DBSMJA
Show answer
Answer: (A) AJMSB Each letter is shifted 2 place(s) backward.
Question 8

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

  1. AOKZMS
  2. BSMZKO
  3. CPLANT
  4. DQMBOU
Show answer
Answer: (A) OKZMS Each letter is shifted 1 place(s) backward.
Question 9

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

  1. A18
  2. B21
  3. C17
  4. D20
Show answer
Answer: (B) 21 Add the alphabet positions of the letters: 6 + 1 + 14 = 21.
Question 10

In a certain code language, GLASS is written as INCUU. How is HOUSE written in that code?

  1. AJQWUG
  2. BFMSQC
  3. CLSYWI
  4. DKRXVH
Show answer
Answer: (A) JQWUG Each letter is shifted 2 place(s) forward.

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Question 11

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

  1. A21
  2. B26
  3. C23
  4. D19
Show answer
Answer: (C) 23 Add the alphabet positions of the letters: 2 + 1 + 20 = 23.
Question 12

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

  1. AAQHBJ
  2. BDTKEM
  3. CLDJSC
  4. DCSJDL
Show answer
Answer: (D) CSJDL Each letter is shifted 1 place(s) forward.
Question 13

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

  1. A43
  2. B44
  3. C41
  4. D39
Show answer
Answer: (C) 41 Add the alphabet positions of the letters: 3 + 15 + 23 = 41.
Question 14

In a certain code language, PAPER is written as SDSHU. How is QUEEN written in that code?

  1. ATXHHQ
  2. BWAKKT
  3. CUYIIR
  4. DNRBBK
Show answer
Answer: (A) TXHHQ Each letter is shifted 3 place(s) forward.
Question 15

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

  1. A50
  2. B54
  3. C52
  4. D53
Show answer
Answer: (B) 54 Add the alphabet positions of the letters: 19 + 21 + 14 = 54.
Question 16

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

  1. AQHUDQ
  2. BTKXGT
  3. CNERAN
  4. DPGTCP
Show answer
Answer: (D) PGTCP Each letter is shifted 2 place(s) backward.

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

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