Coding-Decoding

Ladakh Police Sub-Inspector · 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 DESK coded when each letter is replaced by its position number, separated by hyphens?

  1. 5-6-20-12
  2. 4-5-19-11
  3. 23-22-8-16
  4. 3-4-18-10
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Answer: B. Positions: 4-5-19-11.

Sample Easy question 2

If GARDEN is coded as KEVHIR in a certain code, how is PLANT coded in the same code?

  1. LHWJP
  2. SODQW
  3. TPERX
  4. UQFSY
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Answer: C. The shift is 4: GARDEN → KEVHIR, so PLANT → TPERX.

Sample Easy question 3

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 Medium question 4

In a certain code, each letter is replaced by the letter 3 places ahead of it. If a word is coded as UDLQ, what was the original word?

  1. QZHM
  2. SBJO
  3. RAIN
  4. XGOT
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Answer: C. Move each letter 3 step(s) back: UDLQ → RAIN.

Sample Medium question 5

If BRIDGE is coded as CSJEHF in a certain code, how is WINDOW coded in the same code?

  1. YKPFQY
  2. XJOEPX
  3. WINDOW
  4. VHMCNV
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Answer: B. The shift is 1: BRIDGE → CSJEHF, so WINDOW → XJOEPX.

Sample Medium question 6

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 HOUSE written in that code?

  1. SLFHV
  2. UBHFR
  3. TMGIW
  4. ESUOH
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Answer: A. A↔Z, B↔Y, …: H O U S E → S L F H V.

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