Crack the Code: Fun Coding and Decoding Quiz Quiz

  1. Letter Replacement Coding

    If in a certain code 'CAT' is written as 'DBU', how is 'DOG' written in that code?

    1. EPH
    2. EOH
    3. DPH
    4. EOG
    5. CFH
  2. Number-Letter Correspondence

    In a code, each letter stands for its position in the English alphabet (A=1, B=2,..., Z=26). What is the code for 'CAB'?

    1. 312
    2. 314
    3. 3124
    4. 3122
    5. 3126
  3. Reversal Coding

    If 'STAR' is coded as 'RATS', what is the code for 'SNOW'?

    1. WONS
    2. SONW
    3. WONS
    4. SWON
    5. NWOS
  4. Substitution Coding

    If 'RED' is called 'BLUE', 'BLUE' is called 'GREEN', and 'GREEN' is called 'YELLOW', what is the color of the sky?

    1. GREEN
    2. BLUE
    3. YELLOW
    4. RED
    5. PURPLE
  5. Digit Replacement

    In a certain code language, '4' is written as '7', '7' as '9', and '9' as '3'. What will be the code for '4+9'?

    1. 7+3
    2. 7+9
    3. 9+3
    4. 7+4
    5. 4+3
  6. Pattern Recognition

    If '1234' is coded as '2345', then how is '7890' coded?

    1. 8901
    2. 8900
    3. 7891
    4. 7881
    5. 6790
  7. Word Coding with Rule

    If the word 'FISH' is coded by shifting all letters forward by two (F→H, I→K, S→U, H→J), what is the code for 'BIRD'?

    1. DKTF
    2. DIPC
    3. DKPF
    4. BISD
    5. DJRD
  8. Symbol Coding

    In a certain code, '+' means '-', '-' means '*', and '*' means '+'. What is the value of 3 * 2 + 4 in this code?

    1. 5
    2. 10
    3. 1
    4. 7
    5. 3
  9. Mixed Letters Coding

    If 'HOUSE' is coded as 'SUOHE', which is formed by reversing the first three letters and then the last two, how is 'MOUSE' coded?

    1. UOMSE
    2. SUOEM
    3. UOMES
    4. UOSME
    5. SUMOE
  10. Sequence Coding

    If in a code, every alternate letter starting from the first is written, what is the code for 'CODING'?

    1. CDN
    2. COG
    3. CDG
    4. CIN
    5. CNG
  11. Odd-Even Coding

    If vowels are replaced by the next letter and consonants remain the same, what is the code for 'MAP'?

    1. MBQ
    2. MBP
    3. MAQ
    4. MBB
    5. MBR
  12. Double Letter Coding

    If each letter in a word is doubled (e.g., 'A' becomes 'AA'), how would 'SUN' be coded?

    1. SSUUNN
    2. SUUN
    3. SSUUN
    4. SNUU
    5. SNSUUN
  13. Incremental Coding

    If in a code, each digit in a number is increased by 1 to get the code (e.g., 234 → 345), how is '567' coded?

    1. 678
    2. 568
    3. 578
    4. 668
    5. 5687
  14. Final Letter Coding

    If each word is coded by its last letter repeated twice, what is the code for 'RABBIT'?

    1. TT
    2. II
    3. RR
    4. AA
    5. BB
  15. First and Last Letter Swap

    If the first and last letters of every word are swapped, how does 'CODE' become in this code?

    1. EODC
    2. EDOC
    3. CDOE
    4. EDCO
    5. EOCD