Coding-Decoding

JKSSB Junior Engineer (Mechanical) · Reasoning · 81 practice questions with answers and explanations: 48 Easy, 33 Medium, 0 Hard.

Sample questions

Sample Easy question 1

In a certain code, each letter is replaced by the letter 5 places ahead of it in the alphabet. How is MARKET written in that code?

  1. SGXQKZ
  2. QEVOIX
  3. RFWPJY
  4. HVMFZO
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Answer: C. Move each letter 5 step(s) forward: M A R K E T → R F W P J Y.

Sample Easy question 2

In a certain code, each letter is replaced by the letter 4 places ahead of it. If a word is coded as ERWAIV, what was the original word?

  1. IVAEMZ
  2. BOTXFS
  3. ZMRVDQ
  4. ANSWER
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Answer: D. Move each letter 4 step(s) back: ERWAIV → ANSWER.

Sample Easy question 3

In a certain code, each letter is replaced by the letter 3 places before it in the alphabet. How is OFFICE written in that code?

  1. LCCFZB
  2. MDDGAC
  3. RIILFH
  4. KBBEYA
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Answer: A. Move each letter 3 step(s) backward: OFFICE → LCCFZB.

Sample Medium question 4

In a certain code, letters in odd positions are moved 2 place(s) ahead and letters in even positions are moved 3 place(s) ahead. How is SALT coded?

  1. VCOV
  2. UDNW
  3. VDOW
  4. UCNV
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Answer: B. Apply +2 to positions 1, 3, 5… and +3 to positions 2, 4, 6…: UDNW.

Sample Medium question 5

In a certain code, the letters of a word are written in reverse order and then each letter is moved 1 place(s) ahead. How is GARDEN coded?

  1. OFESBH
  2. NEDRAG
  3. HBSEFO
  4. MDCQZF
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Answer: A. Reverse: NEDRAG; shift each letter 1 ahead: OFESBH.

Sample Medium question 6

In a certain code, letters in odd positions are moved 1 place(s) ahead and letters in even positions are moved 3 place(s) ahead. How is ANSWER coded?

  1. BOTXFS
  2. DOVXHS
  3. DQVZHU
  4. BQTZFU
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Answer: D. Apply +1 to positions 1, 3, 5… and +3 to positions 2, 4, 6…: BQTZFU.

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