Coding-Decoding

LSSSSB Non-Technical · Reasoning · 81 practice questions with answers and explanations: 48 Easy, 33 Medium, 0 Hard.

Sample questions

Sample Easy question 1

If A = 1, B = 2, C = 3 and so on, how is BELL coded when each letter is replaced by its position number, separated by hyphens?

  1. 3-6-13-13
  2. 1-4-11-11
  3. 25-22-15-15
  4. 2-5-12-12
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Answer: D. Positions: 2-5-12-12.

Sample Easy question 2

If FISH is coded as ILVK in a certain code, how is RAIN coded in the same code?

  1. TCKP
  2. OXFK
  3. VEMR
  4. UDLQ
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Answer: D. The shift is 3: FISH → ILVK, so RAIN → UDLQ.

Sample Easy question 3

In a certain code, each letter is replaced by the letter 4 places ahead of it in the alphabet. How is PAPER written in that code?

  1. SDSHU
  2. TETIV
  3. LWLAN
  4. UFUJW
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Answer: B. Move each letter 4 step(s) forward: P A P E R → T E T I V.

Sample Medium question 4

If RIVER is coded as SJWFS (each letter shifted forward by 1), how is OCEAN coded?

  1. PDFBO
  2. PDFCO
  3. PDEBO
  4. PDFBP
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Answer: A. Shifting each letter of OCEAN forward by 1 gives P,D,F,B,O = PDFBO.

Sample Medium question 5

In a certain code, each letter is replaced by its opposite letter in the alphabet (A↔Z, B↔Y, C↔X and so on). How is PLANT written in that code?

  1. LPANH
  2. TNALP
  3. KOZMG
  4. CYNAG
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Answer: C. A↔Z, B↔Y, …: P L A N T → K O Z M G.

Sample Medium question 6

In a certain code, the letters of a word are written in reverse order and then each letter is moved 3 place(s) ahead. How is CAT coded?

  1. FDW
  2. QXZ
  3. WDF
  4. TAC
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Answer: C. Reverse: TAC; shift each letter 3 ahead: WDF.

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