Coding-Decoding MCQs

Coding-decoding MCQs with worked solutions: letter shifts, reverse order, opposite letters, position-sum and step-shift codes, as asked in SSC and IBPS reasoning.

1. 1

   In a certain code, CAT is written as DBU. How is DOG written in that code?

   AHPEBEPHCFQIDCNF

   Correct answer: B. EPH

   Each letter moves 1 place forward in the alphabet (C → D). Applying the same rule to DOG gives EPH.

   easyShow answer
2. 2

   In a certain code, BOOK is written as DQQM. How is PAGE written in that code?

   ARCIGBNYECCSDJHDGICR

   Correct answer: A. RCIG

   Each letter moves 2 places forward in the alphabet (B → D). Applying the same rule to PAGE gives RCIG.

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3. 3

   In a certain code, RIVER is written as SJWFS. How is OCEAN written in that code?

   AQEGCPBOBFDPCNBDZMDPDFBO

   Correct answer: D. PDFBO

   Each letter moves 1 place forward in the alphabet (R → S). Applying the same rule to OCEAN gives PDFBO.

   easyShow answer
4. 4

   In a certain code, TRAIN is written as WUDLQ. How is BUSES written in that code?

   AYRPBPBEXVHVCFYWIWDVHVXE

   Correct answer: B. EXVHV

   Each letter moves 3 places forward in the alphabet (T → W). Applying the same rule to BUSES gives EXVHV.

   mediumShow answer
5. 5

   In a certain code, DELHI is written as CDKGH. How is GOA written in that code?

   AGOABHPBCZNFDFNZ

   Correct answer: D. FNZ

   Each letter moves 1 place back in the alphabet (D → C). Applying the same rule to GOA gives FNZ.

   easyShow answer
6. 6

   In a certain code, MOTHER is written as OQVJGT. How is FATHER written in that code?

   AIDWKHUBTGJVCHCHCVJGTDDYRFCP

   Correct answer: C. HCVJGT

   Each letter moves 2 places forward in the alphabet (M → O). Applying the same rule to FATHER gives HCVJGT.

   mediumShow answer
7. 7

   In a certain code, SCHOOL is written as QAFMMJ. How is LIBRARY written in that code?

   ANKDTCTABWPYPZGJCKHAQZQXDJGZPYPW

   Correct answer: D. JGZPYPW

   Each letter moves 2 places back in the alphabet (S → Q). Applying the same rule to LIBRARY gives JGZPYPW.

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8. 8

   In a certain code, PEN is written as NEP. How is CUP written in that code?

   ADVQBQVDCPUCDUPC

   Correct answer: C. PUC

   The letters are written in reverse order (PEN → NEP), so CUP becomes PUC.

   easyShow answer
9. 9

   In a certain code, STAR is written as RATS. How is MOON written in that code?

   AOPPNBNPPOCOONMDNOOM

   Correct answer: D. NOOM

   The letters are written in reverse order (STAR → RATS), so MOON becomes NOOM.

   easyShow answer
10. 10

    In a certain code, LAMP is written as PMAL. How is DESK written in that code?

    ALTFEBKSEDCEFTLDESKD

    Correct answer: B. KSED

    The letters are written in reverse order (LAMP → PMAL), so DESK becomes KSED.

    easyShow answer
12. 11

    In a certain code, GOLD is written as TLOW. How is IRON written in that code?

    ASJMNBRILMCMLIRDVEBA

    Correct answer: B. RILM

    Each letter is replaced by its opposite in the alphabet (A↔Z, B↔Y, C↔X …): G → T. So IRON becomes RILM.

    hardShow answer
13. 12

    In a certain code, WATER is written as DZGVI. How is EARTH written in that code?

    AVZIGSBWAJHTCRNEGUDSGIZV

    Correct answer: A. VZIGS

    Each letter is replaced by its opposite in the alphabet (A↔Z, B↔Y, C↔X …): W → D. So EARTH becomes VZIGS.

    hardShow answer
14. 13

    In a certain code, BLUE is written as YOFV. How is PINK written in that code?

    APMRKBLSNQCKRMPDCVAX

    Correct answer: C. KRMP

    Each letter is replaced by its opposite in the alphabet (A↔Z, B↔Y, C↔X …): B → Y. So PINK becomes KRMP.

    hardShow answer
15. 14

    If ACE is coded as 9 (the sum of the letters' positions in the alphabet), what is the code for BAD?

    A5B7C8D10

    Correct answer: B. 7

    Add the alphabet positions: B = 2, A = 1, D = 4. Total = 7.

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16. 15

    If BAG is coded as 10 (the sum of the letters' positions in the alphabet), what is the code for HIDE?

    A24B27C26D29

    Correct answer: C. 26

    Add the alphabet positions: H = 8, I = 9, D = 4, E = 5. Total = 26.

    mediumShow answer
17. 16

    If KITE is coded as 45 (the sum of the letters' positions in the alphabet), what is the code for LAMB?

    A26B28C29D31

    Correct answer: B. 28

    Add the alphabet positions: L = 12, A = 1, M = 13, B = 2. Total = 28.

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18. 17

    In a certain code, ABC is written as BDF. How is DEF written in that code?

    AEGIBEFGCIGEDFGH

    Correct answer: A. EGI

    The first letter moves 1 place forward, the second 2 places, the third 3 places, and so on (ABC → BDF). So DEF becomes EGI.

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    hardShow answer
19. 18

    In a certain code, HOME is written as IQPI. How is WORK written in that code?

    AOUQXBYQTMCXQUODXPSL

    Correct answer: C. XQUO

    The first letter moves 1 place forward, the second 2 places, the third 3 places, and so on (HOME → IQPI). So WORK becomes XQUO.

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    hardShow answer
20. 19

    If BAKE is coded as 2-1-11-5 (each letter replaced by its position in the alphabet), what is the code for CAFE?

    A3-1-5-6B4-2-7-6C3-1-6-5D5-6-1-3

    Correct answer: C. 3-1-6-5

    C = 3, A = 1, F = 6, E = 5, so CAFE = 3-1-6-5.

    easyShow answer
21. 20

    In a certain code, each letter is moved two places forward in the alphabet. Which word is written as RNCPV?

    APLANTBOKZMSCTPERXDPLANE

    Correct answer: A. PLANT

    Decode by moving each letter two places back: R → P, N → L, C → A, P → N, V → T. The word is PLANT.

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