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Reasoning practice

Coding and Decoding Questions with Answers

Letter, number and symbol codes, including the layered codes that need two rules applied in order. This page pools every coding and decoding question on the site (326 of them, from 50 exams, weighted towards Banking, Railways, SSC) so you can drill the topic on its own instead of meeting four of them inside a full paper.

20% of the pool is graded hard on this site’s own scale and 7% easy, which is about average for this section.

Questions
326
Practice set
25 in 25 min
Difficulty
24/238/64
Negative marking
None
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Coding and Decoding questions with solutions

6 from the 326-question pool, worked in full.

  1. 1. In a code, each letter is shifted three places forward in the alphabet, so CAT is written as FDW. How is DOG written?

    • A. GRI
    • B. GRJ ✓
    • C. GQJ
    • D. FRJ

    Solution. Shifting each letter three places forward: D→G, O→R, G→J, so DOG is written as GRJ.

  2. 2. In a code, "save money wisely" is written as "ta ba da" and "invest money safely" is written as "da ka ra". What is the code for "money"?

    • A. ba
    • B. da ✓
    • C. ka
    • D. ra

    Solution. "Money" appears in both statements, which share only the code "da", so "da" codes for "money".

  3. 3. In a code, each letter of the alphabet is replaced by the letter that is 3 positions ahead (cyclically). What does "BANK" become?

    • A. DCPM
    • B. DCQN
    • C. EDQN ✓
    • D. EDQM

    Solution. Shifting each letter 3 positions ahead: B->E, A->D, N->Q, K->N, giving EDQN.

  4. 4. If in a code language CAT = 3-1-20 and DOG = 4-15-7, what does BAT equal in the same code?

    • A. 2-1-20 ✓
    • B. 2-1-19
    • C. 3-1-20
    • D. 2-2-20

    Solution. Each letter is coded by its position in the alphabet: B=2, A=1, T=20, giving 2-1-20.

  5. 5. In a certain code, the value of a word is the sum of the positions of its letters in the alphabet. If 'CAT' has a value of 24 (C=3, A=1, T=20), find the value of 'DOG'.

    • A. 24
    • B. 25
    • C. 26 ✓
    • D. 27

    Solution. D=4, O=15, G=7. Sum = 4+15+7 = 26.

  6. 6. In a certain code, "BRANCH" is written as "CSBODI". How is "MARKET" written in the same code?

    • A. NBSLFV
    • B. NBSLFU ✓
    • C. NBSMFU
    • D. MBSLFU

    Solution. Each letter is shifted forward by one place in the alphabet: M→N, A→B, R→S, K→L, E→F, T→U, giving NBSLFU.

Exams that set Coding and Decoding

9 categories, led by Banking, Railways, SSC.

    Drawn from AFCAT, AILET, ATIT, ATMA, CA Foundation, CUCET, IBPS Clerk, IBPS PO, IBPS RRB Office Assistant, IBPS RRB Officer Scale I, IBPS SO, IMU-CET, INET, JAIN JET, KMAT Karnataka, LIC AAO, MAT, MH CET Law, MH CET Law (3-Year LLB), MPPSC SSE, NABARD Grade A, NIACL AO, NMAT, OPSC OCS, PULEET, RBI Assistant, RBI Grade B, RPF Constable, RPF Sub-Inspector, RRB ALP, RRB Group D, RRB Junior Engineer, RRB Paramedical, RRB Technician, SBI Clerk, SBI PO, SEBI Grade A, SIDBI Grade A & B, SNAP, SSC CGL, SSC CHSL, SSC CPO, SSC GD Constable, SSC Junior Engineer, SSC MTS, SSC Stenographer, Territorial Army, TG LAWCET, UPPSC PCS, UPSC CSE. Browse all exams.

    Coding and Decoding: frequently asked questions

    How many coding and decoding questions are there?

    326, from the 50 exams here whose syllabus sets the topic. 7% are graded easy and 20% hard, which makes coding and decoding about average for this section, where the mean is 17%.

    Which exams ask coding and decoding questions?

    50 of the exams on this site, weighted towards Banking (14), Railways (7), SSC (7). Every question in this pool comes from one of their own mock tests, so the list below is the honest answer to whether the topic is worth your time.

    Is coding and decoding hard?

    20% of these 326 questions are graded hard and 7% easy, making it about average for this section, where the mean is 17%.

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