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Reasoning Ability | Questions

Coding and Decoding questions with solutions

Coding and Decoding is a Reasoning Ability topic for competitive exams. It is tested in IBPS RRB Clerk, IBPS RRB PO, IBPS SO, IBPS Clerk and other exams. This page has 25 solved coding and decoding questions written to the official pattern, with a worked solution under each.

25 questionsReasoning Ability
  1. Question 1Easy

    In a certain code, CAT is written as DBU (each letter moved one step forward). How is DOG written in the same code?

    • A.EPHCorrect
    • B.EPG
    • C.FPH
    • D.EQH
    Show solution

    Each letter moves one step forward. D becomes E, O becomes P and G becomes H, giving EPH.

  2. Question 2Easy

    If each letter is given its position in the English alphabet (A = 1, B = 2, and so on) and a word's code is the sum of its letters, what is the code for the word CAB?

    • A.5
    • B.6Correct
    • C.7
    • D.8
    • E.9
    Show solution

    C is the 3rd letter, A the 1st and B the 2nd. Adding their positions gives 3 + 1 + 2 = 6, so the code for CAB is 6.

  3. Question 3Easy

    In a certain code, MONEY is written as NPOFZ. How will BANK be written in the same code?

    • A.CBOLCorrect
    • B.CBLO
    • C.ABOL
    • D.CAOL
    • E.DBOL
    Show solution

    Each letter moves one step forward: M to N, O to P, N to O, E to F, Y to Z. Applying the same shift to BANK gives B to C, A to B, N to O and K to L, which is CBOL.

  4. Question 4Easy

    In a certain code, FARM is written as GBSN. Following the same rule, how is CROP written?

    • A.DSPQCorrect
    • B.DSQP
    • C.ESPQ
    • D.DSPR
    Show solution

    Each letter moves one step forward: F to G, A to B, R to S, M to N. Apply the same to CROP: C to D, R to S, O to P, P to Q, which gives DSPQ.

  5. Question 5Easy

    If A = 1, B = 2, C = 3 and so on, and the code for a word is the sum of its letters, what is the code for ACE?

    • A.7
    • B.10
    • C.9Correct
    • D.8
    Show solution

    A = 1, C = 3, E = 5, so the code is 1 + 3 + 5 = 9.

  6. Question 6Easy

    If TRAIN is coded as USBJO, how will BUS be coded?

    • A.CVTCorrect
    • B.CTV
    • C.AVT
    • D.CVS
    Show solution

    Match the letters in order: T to U, R to S, A to B, I to J and N to O. Every letter moves one step forward. Applying the same shift to BUS gives B to C, U to V and S to T, which is CVT.

These are 6 of 25 coding and decoding questions in the bank. Attempt the rest with instant feedback in the practice drills, or under a clock in the mock tests.

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Frequently asked questions

How many Coding and Decoding questions are here?

This page shows 6 worked coding and decoding questions from a bank of 25, spanning 10 easy, 13 moderate and 2 hard. The full set is available to attempt in the timed-free practice drills and the mock tests.

Which exams ask Coding and Decoding questions?

Coding and Decoding is part of the Reasoning Ability syllabus for IBPS RRB Clerk, IBPS RRB PO, IBPS SO, IBPS Clerk, SBI Clerk, IBPS PO, SBI PO, RRB Ministerial and Isolated Categories, RPF SI, RRB Section Controller, RPF Constable, RRB JE, RRB Technician, RRB ALP, RRB Group D, NABARD Office Attendant, RBI Office Attendant, RBI Assistant, RRB Paramedical Staff, RRB NTPC, NABARD Development Assistant, NIACL AO, Delhi Police Constable, SSC Stenographer, SSC CGL, NABARD Grade A, SSC CPO, SSC Selection Post, SSC MTS, SSC CHSL, SSC GD Constable, LIC AAO. Weightage varies by exam and stage — check each exam's page for its pattern.

Are these Coding and Decoding questions free, and are the answers reliable?

Yes. Every question is free, written in-house to the exam pattern rather than copied from a real paper, and the numeric answer keys are recomputed independently at build time — a wrong key fails the build rather than reaching you.