Coding And Decoding — Part 2 MCQs with Explanations

The code contains the letters of the word in the order - third, fourth, second, fifth, first and sixth.

Each letter of the word except the first and the last letters, is moved one step forward and then the order of the letters so obtained, is reversed to get the code.

The letters of the word are written in a reverse order and the group of letters so obtained, the first, third and fifth letters are each moved one step forward while the second and fourth letters are each moved one step backward to get the code.

Divide the word into three groups of two letters each and write the letters of each group in the reverse order. In the group of letters so obtained, the second, fourth and sixth letters are each moved one step forward to get the code. Thus, we have : AN SW ER => NA WS RE => NBWTRF.

Each letter in the word is replaced by the letter which occupies the same position from the other end of the alphabet, to obtain the code.

Each letter in the word is moved one step backward to obtain the corresponding letter 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 middle (i.e. sixth) letter is moved two steps forward to obtain the corresponding letters of the code.

The first, third and fifth letters of the word are each moved one step backward; the second, fourth and sixth letters are moved one, two and three steps forward respectively to obtain the corresponding letters of the code.

The first letter of the word is replaced by a set of two letters - one following it and the other preceding it - in the code. The remaining letters of the word are each moved one step backward to obtain the remaining letters of the code, in order.

All the letters of the word, except the last letter, are written in a reverse order to obtain the code.

The second and third letters, fourth and fifth letters, sixth and seventh letters of the word mutually interchange positions to form the code.

Let us label the letters of the given word from 1 to 9. Then, the code contains the letters of the word in the order 6, 4, 7, 3, 5, 2, 8, 1, 9. Thus we have : MAUSOLEUM => LSEUOAUMM 123456789 => 647352819

The letters in the first half and second half of the word are written n the reverse order and then in the group of letters so obtained, the first, third, fifth and seventh letters are each moved one step forward while the second, fourth, sixth and eighth letters are each moved one step backward to get the code. Thus, we have : TRIANGLE => TRIA/NGLE => AIRT/ELGN => BHSSFKHM.

Keeping the middle letter as it is, the first five and the last five letters of the word are written in the reverse order. In the group of letters so obtained, the first five letters are each moved one step forward, the middle letter is moved two steps forward and the last five letters are each moved one step backward to get the code. Thus, we have : CREDI/B/ILITY => IDERC/B/YTILI => JEFSD/D/XSHKH

Each letter in the word is replaced by the letter which occupies the same position from the other end of the English alphabet, and the group of letters so obtained is then written in the reverse order to get the code. Thus, we have : CRUELTY => XIFVOGB => BGOVFIX.

Each letter in 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 in the word is replaced by a set of two letters - one preceding it and other following it - in the code. Thus, T is replaced by SU, R is replaced by QS and so on.

The first and third letters are each moved one step backward, while the second and fourth letters are each moved one step forward to obtain the corresponding letters of the code. Finally, in the code so obtained, the last letter of the word is inserted at the end.

The first letter of the word is moved to the last position and 'S' is placed at the beginning, to form the code.

The word is divided into groups of three letters each and then the letters in each group are written in a reverse order.

The middle letter remained unaltered in the code. Let us label the five letters before the middle letter as well as those after it, from 1 to 5. Then, the code contains the letters of each group in the order 5, 4, 1, 3, 2. Thus, we have : ESTABLISHED => BAETSLDEIHS 12345/12345 => 54132/54132

The letters of the word are written in the reverse order and in the group of letters so obtained, the first, third and fifth letters are each moved three steps forward while the second and fourth letters are each moved one step backward to get the code.

Each letter in the word is moved three steps forward 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.

The first, third and fifth letters in the word are moved two, three and four steps forward respectively while the second, fourth and sixth letters are moved two, three and four steps backward respectively to obtain the corresponding letters of the code.

The last letter of the word remains unaltered in the code. The first six letters of the word are divided into two groups of three letters each and then, in each group, the last two letters are written in a reverse order.

Divide the word into six sets of two letters each and label these sets from 1 to 6. Then, the code contains these sets in the order 4, 3, 5, 2, 6, 1 with the letters of sets 3, 2, 1 written in a reverse order. Thus, we have : VI SH WA NA TH AN => NA AW TH HS AN IV.

The letters in the first half and second half of the word are written in the reverse order and then each letter of the group so obtained is moved one step forward to get the code. Thus, we have : SILVER => SIL/VER => LIS/REV => MJT/SFW

The last four letters of the word are written in the reverse order, followed by the first three letters in the same order. In the group of letters so obtained, each letter except the middle letter is moved one step backward while the middle letter is moved one step forward to get the code. Thus, we have : SUPREME => SUP/REME => EMER/SUP => DLD/SRTO.

If in the word, a letter is the nth letter from the beginning of the English alphabet, then in the code the corresponding letter is the nth letter from the end.

The original and rearranged letter sequences are as shown : ABCDEFGHIJKLMNOPQRSTUVWXYZ BCDFGHJKLMNPQRSTVWXYZAEIOU Thus, the code for META is QGYB.

Each of the first four letters in the word is moved one step backward, while each of the last five letters is moved one step forward to obtain the corresponding letter of the code.

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

Each letter in the given message is moved two steps backward to obtain the corresponding letter of the code. The last letter of the third word in the given sentence is Y, which shall be coded as W.

The word is first written twice and the letters at the even positions in the word so obtained, form the code.

The letters in the first half and second half of the word are written in the reverse order to obtain the code. Thus, we have : MYSORE => MYS/ORE => SYM/ERO => SYMERO.

The word is divided into groups of four letters each and then the letters in each group are written in a reverse order.

Divide the word into five sets of two letters each and label these sets from 1 to 5. Then the code contains these sets in the order 5, 4, 3, 2, 1 with the letters of sets 5, 3, 1 written in a reverse order. Thus, we have : PO PU LA RI SE => ES RI AL PU OP 1 2 3 4 5 => 5 4 3 2 1

The letters in the first half and second half of the word are written in the reverse order and in the group of letters so obtained, each letter in the first half is moved one step forward while that in the second half is moved one step backward, to get the code. Thus, we have : STABILISED => STABI/LISED => IBATS/DESIL => JCBUT/CDRHK

The last four letters of the word are written in the reverse order, followed by the first four letters in the same order. In the group of letters so obtained, each of the first four letters is moved one step backward while each of the last four letters is moved one step forward to get the code. Thus, we have : SHOULDER => SHOU/LDER => REDL/SHOU => QDCK/TIPV