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Multiple Choice Questions (MCQ) on Coding Decoding is a logical reasoning test to evaluate your ability to decode the message given in the question. MCQ on Coding and Decoding are asked in competitive exams like Bank PO/Clerk, SBI PO, SBI Clerk, IBPS PO, IBPS Clerk, IBPS RRB, RBI, SSC, SSC CGL, SSC CHSL, SSC MTS, SSC GD, RRB NTPC, and RRB Group D

Coding Decoding MCQ

Coding hides the meaning of any message, and decoding allows one to understand the actual meaning of that message.
In questions based on coding-decoding, a word or sentence is coded in a particular way, and the candidates are asked to code another word or sentence in the same way or to decode the word or sentence.

Position of Letters in English Alphabet
Sometimes a word or a sentence is coded by changing the position of English alphabet letters according to a definite pattern, so it is necessary to remember the positions of all the letters in English alphabetical order, both in forward and backward order.

A=1, B=2, C=3, … Z=26
A=26, B=25, C=24 … Z=1

Types of Coding-Decoding
Type #1: Letter/Number Coding: In this type of coding, we deal with questions, in which the letters of a word are replaced by certain other letters or numbers according to a specific pattern/rule to form a code. You must detect the coding pattern/rule and answer the question(s) that are asked, based on that coding pattern/rule.

Type #2: Direct Coding: In direct coding, the code letters/numbers/ symbols occur in the same sequence as the corresponding letters occur in the words. This is a direct substitution method.

Type #3: Conditional Coding: In this type, letters/numbers are given along with their code. Candidates must find the codes for a particular letter group/word/number according to certain conditions given in the questions.

Answer the following MCQ on Coding Decoding:

  1. If In a certain language, TAP is coded as SZO, then how will FREEZE be coded as?

A. ESDFYF B. GQFDYF C. EQDFYG D. EQDDYD


Correct Answer: D
Clearly, each letter in the code is the alphabet before the corresponding letter in the word.
s – 1 = T, A – 1 = Z AND P – 1 = O (based on the position of the alphabet).

FREEZE = E (F-1) Q (R – 1) D (E – 1) D (E – 1) Y (Z – 1) D (E – 1) = EQDDYD

  1. If in a certain language, PAPER is written as OZODQ. Which word would be written as RZKD?

A. SEAL B. SALE C. SELL D. SKIP


Correct Answer: B
each letter in the code is the alphabet before the corresponding letter in the word.

PAPER = O (P-1) Z (A-1) O (P-1) D (E-1) Q (R-1) OZODQ
SALE = R (S-1) Z (A-1) K(L-1) D (E-1) = RZKD

  1. If in a certain language, PENSION is coded as NEISNOP, how will FOLIAGE be coded in that code?

A. OFILGAE B. EOAILGF C. FGLIAOE D. EGAILOF


Correct Answer: B
In the code, first and last letters are reversed, second and second last letters are the same, third and third last letters are reversed and the middle letter remains the same.
  1. If PLANE is coded as OKZMD in a certain language, how will TRAIN be coded?

A. SQZHM B. UQBHO C. SQZJM D. USBJM


Correct Answer: A
The letter preceding each letter of the given word in the alphabet is taken as the subsequent letter of its code.
  1. If in a certain language; SPACE is coded as TQBDF, how will PURSE be coded in that code?

A. QTSRF B. OVQTD C. QVSTF D. ESRUP


Correct Answer: C
Each letter of the given word is moved one step ahead to obtain the subsequent letter of its code.
  1. If in a certain language NATURE is coded as MASUQE, how is FAMINE coded in that code?

A. FBMJND B. FZMHND C. GANIOE D. EALIME


Correct Answer: D
The letters preceding the letters at odd places in the given word are taken as the corresponding letters of the code while those at even places remain the same.
  1. If in a certain language MECHANICS is coded as HCEMASCIN, how is POSTER coded in that code?

A. OPTSRE B. SOPRET C. RETSOP D. TERPOS


Correct Answer: B
In the code the first four and the last four letters are reversed in order.
  1. In a certain code, GOODNESS is coded as HNPCODTR. How is GREATNESS coded in that code?

A. HQFZUODTR B. HQFZUMFRT C. HQFZSMFRT D. FSDBSODTR


Correct Answer: B
In the code the letters at odd places are one alphabet ahead and those at even places are one alphabet before the corresponding letter in the word.
  1. If FOUGHT is coded as EQRKCZ, how will MALE be coded?

A. LCH B. NZMD C. KCMI D. NBIF


Correct Answer: A
In the code the first letter is one place before, the second letter is two places ahead the third letter is three places before, the fourth letter is four places ahead, and so on.
  1. If in a certain language BLEMISH is coded as AODPHVG, how will CHAPTER be coded in that code?

A. DEBOVTDR B. BKZSSHQ C. CAHTPRE D. BGAQMFP


Correct Answer: B
In the code, the letters at odd places are one place before and those at even places are three
places ahead of the corresponding letters in the word.

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