Reasoning

Coding-Decoding: Practice Questions with Answers

88 practice questions on Coding-Decoding, with answers; most also have an explanation or a worked solution. Try each one before you open its answer.

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1. Q.51

   In a certain code, CLOUD is written as FORXG. Using the same rule, how is SHEEP written?

   1. A VKHHS
   2. B WLIIT
   3. C XMJJU
   4. D YNKKV
   Show answer

   Correct answer: (A) VKHHS

   Each letter shifts forward by 3 in the alphabet (C→F, ...). Applying the same +3 shift to SHEEP gives VKHHS.

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2. Q.52

   Using the mirror-alphabet rule (A<->Z, B<->Y, C<->X, and so on), how is SILVER coded?

   1. A HROEVI
   2. B IVEORH
   3. C TJMWFS
   4. D ISPFWJ
   Show answer

   Correct answer: (A) HROEVI

   Each letter is replaced by its mirror partner from the opposite end of the alphabet (A<->Z, B<->Y, ...), giving SILVER -> HROEVI.

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3. Q.53

   Using the rule A=1, B=2, C=3, ... Z=26, how is LIGHT coded (letters separated by hyphens)?

   1. A 12-9-7-8-20
   2. B 13-10-8-9-21
   3. C 20-8-7-9-12
   4. D 11-8-6-7-19
   Show answer

   Correct answer: (A) 12-9-7-8-20

   Replacing each letter with its position in the alphabet: L=12, I=9, G=7, H=8, T=20, giving 12-9-7-8-20.

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4. Q.54

   In a certain code, OASIS is written as QCUKU. Using the same rule, how is STEPPE written?

   1. A UVGRRG
   2. B UVGRRF
   3. C UVGRSG
   4. D UWGRRG
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   Correct answer: (A) UVGRRG

   In OASIS->QCUKU, each letter shifts forward by 2 places. Applying the same +2 shift to STEPPE gives UVGRRG.

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5. Q.55

   In a certain code, DUSK is written as EVTL. Using the same rule, how is AURORA written?

   1. A BVSPSB
   2. B BVSPSC
   3. C BVSQSB
   4. D BWSPSB
   Show answer

   Correct answer: (A) BVSPSB

   In DUSK->EVTL, each letter shifts forward by 1 place. Applying the same +1 shift to AURORA gives BVSPSB.

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6. Q.56

   In a certain code, LAGOON is written as ODJRRQ. Using the same rule, how is DESERT written?

   1. A GHVHUW
   2. B GHVHUV
   3. C GHVGUW
   4. D GIVHUW
   Show answer

   Correct answer: (A) GHVHUW

   Every letter in LAGOON->ODJRRQ is shifted forward by 3 places. Applying the same +3 shift to DESERT gives GHVHUW.

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7. Q.57

   Using the mirror-alphabet rule (A<->Z, B<->Y, C<->X, and so on), BLIZZARD is coded as YORAAZIW. How is TORNADO coded?

   1. A GLIMZWL
   2. B GLIMZWM
   3. C GLINZWL
   4. D GMIMZWL
   Show answer

   Correct answer: (A) GLIMZWL

   Each letter is replaced by its mirror partner; applying this to TORNADO gives GLIMZWL.

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8. Q.58

   Using the mirror-alphabet rule (A<->Z, B<->Y, C<->X, and so on), JUPITER is coded as QFKRGVI. How is MONSOON coded?

   1. A NLMHLLM
   2. B MLLHMLN
   3. C NLMHLLN
   4. D NPOTPPO
   Show answer

   Correct answer: (A) NLMHLLM

   Each letter is replaced by its mirror partner in the alphabet (A<->Z, B<->Y, ...). Applying this to MONSOON gives NLMHLLM.

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9. Q.59

   In a certain code, THORN is written as UJPTO, where letters in odd positions (1st, 3rd, 5th...) shift forward by 1 and letters in even positions (2nd, 4th, 6th...) shift forward by 2. Using the same rule, how is PRAIRIE written?

   1. A QTBKSKF
   2. B QTBKSKG
   3. C QSBKSKF
   4. D QTCKSKF
   Show answer

   Correct answer: (A) QTBKSKF

   Odd-position letters shift by +1 and even-position letters shift by +2. Applying this to PRAIRIE gives QTBKSKF.

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10. Q.60

    In a certain code, SMILE is written as TNJMF. Using the same rule, how is TOOTH written?

    1. A UPPUI
    2. B VQQVJ
    3. C WRRWK
    4. D XSSXL
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    Correct answer: (A) UPPUI

    Each letter shifts forward by 1 in the alphabet (S→T, ...). Applying the same +1 shift to TOOTH gives UPPUI.

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11. Q.61

    In a certain code, VALLEY is written as ZEPPIC. Using the same rule, how is CANYON written?

    1. A GERCSR
    2. B GERCRR
    3. C FERCSR
    4. D GESCSR
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    Correct answer: (A) GERCSR

    Every letter in VALLEY->ZEPPIC is shifted forward by 4 places. Applying the same +4 shift to CANYON gives GERCSR.

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12. Q.62

    Using the mirror-alphabet rule (A<->Z, B<->Y, C<->X, and so on), how is VILLAGE coded?

    1. A EROOZTV
    2. B WJMMBHF
    3. C UHKKZFD
    4. D VTZOORE
    Show answer

    Correct answer: (A) EROOZTV

    Each letter is replaced by its mirror partner in the alphabet (A<->Z, B<->Y, ...), giving EROOZTV.

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13. Q.63

    In a certain code, HOUSE is written as KRXVH. Using the same rule, how is GARDEN written?

    1. A JDUGHQ
    2. B KEVHIR
    3. C LFWIJS
    4. D MGXJKT
    Show answer

    Correct answer: (A) JDUGHQ

    Each letter shifts forward by 3 in the alphabet (H→K, ...). Applying the same +3 shift to GARDEN gives JDUGHQ.

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14. Q.64

    Using the mirror-alphabet rule (A<->Z, B<->Y, C<->X, and so on), how is PENINSULA coded?

    1. A KVMRMHFOZ
    2. B KVMRMHFOY
    3. C KVMRNHFOZ
    4. D KWMRMHFOZ
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    Correct answer: (A) KVMRMHFOZ

    Each letter is replaced by its mirror partner in the alphabet; applying this to PENINSULA gives KVMRMHFOZ.

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15. Q.65

    In a certain code, ELEPHANT is written as JQJUMFSY. Using the same rule, how is KITCHEN written?

    1. A PNYHMJS
    2. B QOZINKT
    3. C OMXGLIR
    4. D PRGXSVM
    Show answer

    Correct answer: (A) PNYHMJS

    Each letter shifts forward by 5 in the alphabet (E→J, ...). Applying the same +5 shift to KITCHEN gives PNYHMJS.

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16. Q.66

    Using the rule A=1, B=2, C=3, ... Z=26, how is FJORD coded (letters separated by hyphens)?

    1. A 6-10-15-18-4
    2. B 6-10-15-18-5
    3. C 6-9-15-18-4
    4. D 7-10-15-18-4
    Show answer

    Correct answer: (A) 6-10-15-18-4

    Each letter is replaced by its position number: F=6, J=10, O=15, R=18, D=4, giving 6-10-15-18-4.

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17. Q.67

    In a certain code language, "pen is good" is written as "ab cd ef", and "good is costly" is written as "ef cd gh". What is the code for "costly"?

    1. A gh
    2. B ab
    3. C cd
    4. D ef
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    Correct answer: (A) gh

    "costly" is the only word in the second sentence not in the first, so its code must be the only code in the second sentence not in the first's codes: "gh".

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18. Q.68

    In a certain code, MOUSE is written as OQWUG. Using the same rule, how is RABBIT written?

    1. A TCDDKV
    2. B UDEELW
    3. C VEFFMX
    4. D WFGGNY
    Show answer

    Correct answer: (A) TCDDKV

    Each letter shifts forward by 2 in the alphabet (M→O, ...). Applying the same +2 shift to RABBIT gives TCDDKV.

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19. Q.69

    In a certain code, HARBOR is written as MFWGTW. Using the same rule, how is VOYAGE written?

    1. A ATDFLJ
    2. B BTDFLJ
    3. C ATDFLI
    4. D ATEFLJ
    Show answer

    Correct answer: (A) ATDFLJ

    Every letter in HARBOR->MFWGTW is shifted forward by 5 places. Applying the same +5 shift to VOYAGE gives ATDFLJ.

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20. Q.70

    Using the mirror-alphabet rule (A<->Z, B<->Y, C<->X, and so on), how is GARDEN coded?

    1. A TZIWVM
    2. B MVWIZT
    3. C HBSEFO
    4. D UAJXWN
    Show answer

    Correct answer: (A) TZIWVM

    Each letter is replaced by its mirror partner from the opposite end of the alphabet (A<->Z, B<->Y, ...), giving GARDEN -> TZIWVM.

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21. Q.71

    In a certain code, TIGER is written as VKIGT. Using the same rule, how is LION written?

    1. A NKQP
    2. B OLRQ
    3. C PMSR
    4. D QNTS
    Show answer

    Correct answer: (A) NKQP

    Each letter shifts forward by 2 in the alphabet (T→V, ...). Applying the same +2 shift to LION gives NKQP.

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22. Q.72

    Using the mirror-alphabet rule (A<->Z, B<->Y, C<->X, and so on), how is HOSPITAL coded?

    1. A SLHKRGZO
    2. B IPTQJUBM
    3. C GNROHSZK
    4. D OZGRKHLS
    Show answer

    Correct answer: (A) SLHKRGZO

    Each letter is replaced by its mirror partner in the alphabet (A<->Z, B<->Y, ...), giving SLHKRGZO.

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23. Q.73

    Using the mirror-alphabet rule (A<->Z, B<->Y, C<->X, and so on), how is CHICKEN coded?

    1. A XSRXPVM
    2. B DIJDLFO
    3. C BGHBJDM
    4. D MVPXRSX
    Show answer

    Correct answer: (A) XSRXPVM

    Each letter is replaced by its mirror partner in the alphabet (A<->Z, B<->Y, ...), giving XSRXPVM.

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24. Q.74

    In a certain code, TABLE is written as WDEOH. Using the same rule, how is CANDLE written?

    1. A FDQGOH
    2. B GERHPI
    3. C HFSIQJ
    4. D IGTJRK
    Show answer

    Correct answer: (A) FDQGOH

    Each letter shifts forward by 3 in the alphabet (T→W, ...). Applying the same +3 shift to CANDLE gives FDQGOH.

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25. Q.75

    In a certain code, SILVER is written as YORBKX. Using the same rule, how is CHICKEN written?

    1. A INOIQKT
    2. B JOPJRLU
    3. C HMNHPJS
    4. D XSRXPVM
    Show answer

    Correct answer: (A) INOIQKT

    Each letter shifts forward by 6 in the alphabet (S→Y, ...). Applying the same +6 shift to CHICKEN gives INOIQKT.

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26. Q.76

    Using the rule A=1, B=2, C=3, ... Z=26, how is SAVANNA coded (letters separated by hyphens)?

    1. A 19-1-22-1-14-14-1
    2. B 19-1-22-1-14-14-2
    3. C 19-2-22-1-14-14-1
    4. D 18-1-22-1-14-14-1
    Show answer

    Correct answer: (A) 19-1-22-1-14-14-1

    Each letter is replaced by its position number: S=19, A=1, V=22, A=1, N=14, N=14, A=1, giving 19-1-22-1-14-14-1.

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27. Q.77

    Using the mirror-alphabet rule (A<->Z, B<->Y, C<->X, and so on), how is FESTIVAL coded?

    1. A UVHGREZO
    2. B GFTUJWBM
    3. C EDRSHUZK
    4. D OZERGHVU
    Show answer

    Correct answer: (A) UVHGREZO

    Each letter is replaced by its mirror partner in the alphabet (A<->Z, B<->Y, ...), giving UVHGREZO.

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28. Q.78

    Using the mirror-alphabet rule (A<->Z, B<->Y, C<->X, and so on), how is FRIEND coded?

    1. A UIRVMW
    2. B WMVRIU
    3. C GSJFOE
    4. D VJSWNX
    Show answer

    Correct answer: (A) UIRVMW

    Each letter is replaced by its mirror partner from the opposite end of the alphabet (A<->Z, B<->Y, ...), giving FRIEND -> UIRVMW.

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29. Q.79

    In a certain code, BREAD is written as FVIEH. Using the same rule, how is CRUST written?

    1. A GVYWX
    2. B HWZXY
    3. C IXAYZ
    4. D JYBZA
    Show answer

    Correct answer: (A) GVYWX

    Each letter shifts forward by 4 in the alphabet (B→F, ...). Applying the same +4 shift to CRUST gives GVYWX.

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30. Q.80

    In a certain code, LETTER is written as MGUVFT, where letters in odd positions (1st, 3rd, 5th...) shift forward by 1 and letters in even positions (2nd, 4th, 6th...) shift forward by 2. Using the same rule, how is WINDOW written?

    1. A XKOFPY
    2. B YJPEQX
    3. C XJOEPX
    4. D XKOFPZ
    Show answer

    Correct answer: (A) XKOFPY

    Odd-position letters shift by +1 and even-position letters shift by +2. Applying this to WINDOW gives XKOFPY.

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31. Q.81

    In a certain code, STONE is written as TUPOF. Using the same rule, how is GLASS written?

    1. A HMBTT
    2. B INCUU
    3. C JODVV
    4. D KPEWW
    Show answer

    Correct answer: (A) HMBTT

    Each letter shifts forward by 1 in the alphabet (S→T, ...). Applying the same +1 shift to GLASS gives HMBTT.

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32. Q.82

    In a certain code, GARDEN is written as LFWIJS. Using the same rule, how is MORNING written?

    1. A RTWSNSL
    2. B SUXTOTM
    3. C RTWSNLS
    4. D QSVRMRK
    Show answer

    Correct answer: (A) RTWSNSL

    Every letter in GARDEN->LFWIJS is shifted forward by 5 places. Applying the same +5 shift to MORNING gives RTWSNSL.

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33. Q.83

    In a certain code, FOREST is written as HPTFUU, where letters in odd positions (1st, 3rd, 5th...) shift forward by 2 and letters in even positions (2nd, 4th, 6th...) shift forward by 1. Using the same rule, how is MARKET written?

    1. A OBTLGU
    2. B NCSMFV
    3. C OCTMGV
    4. D OBTLGV
    Show answer

    Correct answer: (A) OBTLGU

    Odd-position letters shift by +2 and even-position letters shift by +1. Applying this to MARKET gives OBTLGU.

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34. Q.84

    In a certain code, GLACIER is written as MRGIOKX. Using the same rule, how is VOLCANO written?

    1. A BURIGTU
    2. B BURIGTV
    3. C BURIGSU
    4. D BVRIGTU
    Show answer

    Correct answer: (A) BURIGTU

    Every letter in GLACIER->MRGIOKX is shifted forward by 6 places. Applying the same +6 shift to VOLCANO gives BURIGTU.

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35. Q.85

    Using the mirror-alphabet rule (A<->Z, B<->Y, C<->X, and so on), how is SPRING coded?

    1. A HKIRMT
    2. B TMRIKH
    3. C TQSJOH
    4. D ILJSNU
    Show answer

    Correct answer: (A) HKIRMT

    Each letter is replaced by its mirror partner from the opposite end of the alphabet (A<->Z, B<->Y, ...), giving SPRING -> HKIRMT.

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36. Q.86

    Using the rule A=1, B=2, C=3, ... Z=26, how is DREAM coded (letters separated by hyphens)?

    1. A 4-18-5-1-13
    2. B 5-19-6-2-14
    3. C 13-1-5-18-4
    4. D 3-17-4-0-12
    Show answer

    Correct answer: (A) 4-18-5-1-13

    Replacing each letter with its position in the alphabet: D=4, R=18, E=5, A=1, M=13, giving 4-18-5-1-13.

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37. Q.87

    In a certain code, DIAMOND is written as FKCOQPF. Using the same rule, how is HOSPITAL written?

    1. A JQURKVCN
    2. B KRVSLWDO
    3. C IPTQJUBM
    4. D SLHKRGZO
    Show answer

    Correct answer: (A) JQURKVCN

    Each letter shifts forward by 2 in the alphabet (D→F, ...). Applying the same +2 shift to HOSPITAL gives JQURKVCN.

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38. Q.88

    Using the rule A=1, B=2, C=3, ... Z=26, how is ARCHIPELAGO coded (letters separated by hyphens)?

    1. A 1-18-3-8-9-16-5-12-1-7-15
    2. B 1-18-3-8-9-16-5-12-1-7-14
    3. C 1-19-3-8-9-16-5-12-1-7-15
    4. D 1-18-4-8-9-16-5-12-1-7-15
    Show answer

    Correct answer: (A) 1-18-3-8-9-16-5-12-1-7-15

    Each letter is replaced by its position number: A=1, R=18, C=3, H=8, I=9, P=16, E=5, L=12, A=1, G=7, O=15, giving 1-18-3-8-9-16-5-12-1-7-15.

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