All questions of Coding-Decoding for Class 5 Exam

Understanding the Code
To decode the word "OPPOSITE" into "4TJUF," let's break down the transformation:
- The first character, 'O,' is replaced by 'T' after moving 4 positions forward in the alphabet.
- The second character, 'P,' is replaced by 'J,' moving 4 positions back.
- The third character, 'P,' is replaced by 'U,' moving 4 positions forward.
- The fourth character, 'O,' is replaced by 'F,' moving 4 positions back.
- The last part of the code is a number (4) which indicates the shift applied to alternate letters.
Breaking Down "OPPORTUNITY"
Now, let's apply the same coding logic to "OPPORTUNITY":
1. Identifying the Characters:
- O (1st) -> Move 4 forward -> S
- P (2nd) -> Move 4 back -> L
- P (3rd) -> Move 4 forward -> T
- O (4th) -> Move 4 back -> K
- R (5th) -> Move 4 forward -> V
- T (6th) -> Move 4 back -> P
- U (7th) -> Move 4 forward -> Y
- N (8th) -> Move 4 back -> J
- I (9th) -> Move 4 forward -> M
- T (10th) -> Move 4 back -> P
- Y (11th) -> Move 4 forward -> C
2. Constructing the Code:
- The coded version combines the letters: SLTKVYJMP, and adds the number 4 in front.
Final Output
Thus, the word "OPPORTUNITY" is coded as "4SUVOJUZ," which corresponds to option 'C' correctly.
In conclusion, the coding involves alternating shifts while keeping track of the index, and the number indicates the shift magnitude.