Olympiad Test : Coding And Decoding - 1 - Class 5 MCQ

In the coding system:

Now, we find the code for GATE:

Putting these together, we get the code for GATE as 5247.

The first letters of the word (LUTE) is moved one step forward to obtain the first letter of the code, while the other letters remain unaltered.

Letters of the word INSTITUTION have been just reversed in the coded word. Hence PERFECTION will be coded as NOITCEFREP

First three letters of the word are kept as it is, sixth letter comes at fourth place shifting fourth and fifth letters to fifth and sixth placed respectively, and last two letters are exchanged.

The coding follows an alternating pattern of letter shifts:

Applying this to GREATNESS:

So, GREATNESS = HQFZUMFRT.

Observe the pattern in EXPLAIN → XELPIAN:

Apply the same to PRODUCE:

Here    M    A        D          R        A        S
          +1↓ +1↓     +1↓     +1↓     +1↓     +1↓
            N    B         E         S        B         T
then     B    O         M         B       A         Y
          +1↓  +1↓     +1↓     +1↓     +1↓     +1↓
            C     P         N        C         B        Z

Each letter of the word has been written one letter backward in the coded word as their positions in the alphabets.

Each letter of the word, except the middle letter, is moved one step backward while the middle letter is moved one step forward to obtain the corresponding letter of the code.

Each letter of the word is moved three steps forward to obtain the corresponding letter of the code.

The coding rule is position-based:

Apply this to INVISIBLE:

So, INVISIBLE = HMUHTJCMF.

The first, third and fifth letters are moved one step backward, while the second, fourth and sixth letters are each moves one step forward to obtain the corresponding letters of the code.

The first letter of the word is moved one step backward, while the two middle letters are each moved one step forward to obtain the corresponding letters of the code.

The first, third, fifth, seventh, ninth and eleventh letters in the word are each moved one step forward: the second, fourth, eighth and tenth letters are each moved one step backward, while the sixth letter is moved two step forward to obtain the corresponding letters of the code.

Each letter of the word is moved two step backward to obtain the corresponding letter of the code.

The letters at the odd numbered positions in the word are each moved two steps forward while those at the even numbered positions are each moved three steps forward to obtain the corresponding letters of the code.

Each letter of the word is moved thirteen steps forward to obtain the corresponding letter of the code.

Here M     I           R        A         C        L        E
        +1↓ +2↓     +3↓     +4↓     +5↓     +6↓    +7↓
         N     K          U        E        H        R        L
Similarly G        A         M        B         L      E
             +1↓     +2↓     +3↓     +4↓     +5↓    +6

Letters at the odd places have been written one letter back.

Each letter in the word is moved one step forward to obtain the corresponding letter of the code.