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Coding-Decoding - Expert Level: shift coding EXPERT

Comprehensive self assessment worksheet covering 20 expert-level coding-decoding problems. Worksheet 28 of 30 emphasizes shift coding. Master encoding rules, decoding techniques, mixed coding through detailed explanations. Difficulty: challenging problems and time-bound practice. Tailored for expert-level preparation.

📝 Worksheet 28 of 30 • 20 questions • ⏱️ Estimated time: 20 minutes • 🎯 Expert level

What you'll learn in this worksheet:
Your progress through Coding-Decoding
Worksheet 28 of 30 (93% complete)

Question 1

If 'BAG' is coded as 'GAB', then how is 'WALL' coded?
The pattern is reverse coding: BAG → GAB, so WALL → LLAW
reverse, pattern

Question 2

If 'LIGHT' is coded as 'THGIL', then how is 'DOOR' coded?
The pattern is reverse coding: LIGHT → THGIL, so DOOR → ROOD
reverse, pattern

Question 3

If 'SOUND' is coded as 'DNUOS', then how is 'CEILING' coded?
The pattern is reverse coding: SOUND → DNUOS, so CEILING → GNILIEC
reverse, pattern

Question 4

If 'SWIFT' is coded as 'VHKYU' using the rule 'reverse the word, then shift each letter by +2', what is the code?
Step 1: Reverse SWIFT → TFIWS, Step 2: Shift +2 → VHKYU
mixed, complex

Question 5

If A=1, B=2, C=3... Z=26, then 'EXAM' is coded as?
Converting each letter to its position number: E=5, X=24, A=1, M=13 → 524113
numbers, substitution

Question 6

In a certain code, vowels become next consonant, consonants become next vowel. How is 'FUNCTION' coded?
Swapping vowel/consonant roles: FUNCTION → IVOEUJPO
conditional, vowels

Question 7

If 'RAT' is coded as 'WFY', then how is 'BAT' coded?
The pattern is shifting each letter by +5. So BAT becomes: B(2→7) → A(1→6) → T(20→25) = GFY
shift, basic

Question 8

If 'THREE' is coded as 'VVISG' using the rule 'replace each letter with its opposite (A↔Z, B↔Y), then reverse', what is the code?
Step 1: Opposite THREE → GSIVV, Step 2: Reverse → VVISG
mixed, complex

Question 9

If the code for 'VALUE' is 'V1L52' using the rule 'vowels replaced by numbers (A=1,E=2,I=3,O=4,U=5)', then what is the original word for the code 'V1L52'?
To decode, replace numbers back to vowels: V1L52 → VALUE
decode, reverse

Question 10

If the code for 'SLOW' is 'HOLD' using the rule 'each letter replaced by its opposite (A↔Z, B↔Y)', then what is the original word for the code 'HOLD'?
To decode, apply opposite again: HOLD → SLOW
decode, reverse

Question 11

In a certain code, vowels become next consonant, consonants become next vowel. How is 'ANALOG' coded?
Swapping vowel/consonant roles: ANALOG → BOBOPI
conditional, vowels

Question 12

In a certain code, vowels become next consonant, consonants become next vowel. How is 'DATABASE' coded?
Swapping vowel/consonant roles: DATABASE → EBUBEBUF
conditional, vowels

Question 13

If the code for 'JAVA' is 'QZEZ' using the rule 'each letter replaced by its opposite (A↔Z, B↔Y)', then what is the original word for the code 'QZEZ'?
To decode, apply opposite again: QZEZ → JAVA
decode, reverse

Question 14

If the code for 'MAT' is 'M1T' using the rule 'vowels replaced by numbers (A=1,E=2,I=3,O=4,U=5)', then what is the original word for the code 'M1T'?
To decode, replace numbers back to vowels: M1T → MAT
decode, reverse

Question 15

If 'BUS' = 42 and 'RAT' = 39, then 'CAR' = ?
Sum of letter positions: BUS = 2+21+19 = 42, RAT = 18+1+20 = 39, CAR = 3+1+18 = 22
position, sum

Question 16

If 'RANK' is coded as 'QZMJ' using the rule 'subtract 1 from each letter's position' (A=1, B=2, ..., Z=26, wrap around), then how is 'SQUARE' coded?
Each letter position -1: RANK → QZMJ
arithmetic, operations

Question 17

If 'MAP' = 30 and 'CUP' = 40, then 'CAT' = ?
Sum of letter positions: MAP = 13+1+16 = 30, CUP = 3+21+16 = 40, CAT = 3+1+20 = 24
position, sum

Question 18

If the code for 'COMPUTER' is 'XLNKFGVI' using the rule 'each letter replaced by its opposite (A↔Z, B↔Y)', then what is the original word for the code 'XLNKFGVI'?
To decode, apply opposite again: XLNKFGVI → COMPUTER
decode, reverse

Question 19

In a certain code, each consonant is replaced by the previous letter (B→A, C→B, etc.). How is 'KERNEL' coded?
Consonants shifted backward: KERNEL → JEQMEK
conditional, vowels

Question 20

If the code for 'MOUSE' is 'OQWUG' using the rule 'each letter shifted forward by 2', then what is the original word for the code 'OQWUG'?
To decode, shift each letter backward by 2: OQWUG → MOUSE
decode, reverse
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