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CET 12th Level — Coding-Decoding MCQs

Practice 20 free coding-decoding multiple choice questions for CET 12th Level exam. Instant answers with explanations in Hindi and English.

Master Coding-Decoding under Mental Ability for CET 12th Level with our curated MCQ set. Every question follows real Rajasthan exam patterns. Switch between Hindi and English anytime.

CET 12th Level — Mental Ability — Coding-Decoding

20 Questions • Instant results & explanations • Hindi & English

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Question 1 of 20

Assertion (A): The most crucial step in solving a coding-decoding problem is identifying the specific rule used to alter the information. Reason (R): Coding rules are universal and strictly follow the forward alphabetical numerical sequence.

Question 2 of 20

Match List-I (Words) with List-II (Codes based on standard forward numerical values): List-I P. MAC Q. CAB R. BAD S. DAD List-II 1. 3-1-2 2. 4-1-4 3. 13-1-3 4. 2-1-4

Question 3 of 20

What is the primary operational utility of converting a meaningful message into a coded, obscure format?

Question 4 of 20

In a specific coding mechanism, 'TANU' is represented as '20-1-14-21'. Based on this exact logic, how would the word 'MAN' be coded?

Question 5 of 20

In word substitution, if 'Blue' is coded as 'Black', and 'Black' is coded as 'Green', what is the actual, un-coded color of the sky?

Question 6 of 20

Consider the following statements defining cryptographic processes: I. Coding is the deliberate process of transforming a meaningful sentence into a meaningless format using a secret rule. II. Decoding is the deliberate process of extracting a meaningful sentence from a meaningless format using the same secret rule. Which of the statements is correct?

Question 7 of 20

Match List-I (Alphabetical ranges) with List-II (Numerical positions) for standard forward coding: List-I P. First three letters Q. Letters E, F, G R. Letters U, V, W S. Last three letters List-II 1. 24, 25, 26 2. 5, 6, 7 3. 1, 2, 3 4. 21, 22, 23

Question 8 of 20

If Z=1, Y=2, X=3, and W=4, what will be the numerical value of the word 'CAB' using this specific logic?

Question 9 of 20

What is the fundamental characteristic of the output generated by the 'Coding' process?

Question 10 of 20

Consider a two-step coding process: First, find the opposite letter, then find its forward numerical position. What is the code for the letter 'C' under this system?

Question 11 of 20

Match the letter with its corresponding forward numerical position (List-I to List-II): List-I P. O Q. P R. Q S. R List-II 1. 18 2. 15 3. 17 4. 16

Question 12 of 20

In the reverse alphabetical numerical coding system, what is the numerical value assigned to the letter 'X'?

Question 13 of 20

If a candidate decides to encrypt the word 'ZOO' strictly adhering to the reverse alphabetical numerical system, what integer will form the very first part of their resulting code?

Question 14 of 20

Match List-I (Alphabetical Letters) with List-II (Reverse Numerical Positions) correctly: List-I P. A Q. B R. C S. D List-II 1. 23 2. 24 3. 25 4. 26

Question 15 of 20

Which of the following best describes the relationship between 'Coding' and 'Decoding'?

Question 16 of 20

Assertion (A): If the word 'RAM' is coded strictly using forward alphabetical positions as '18-1-13', then the word 'MAT' must be coded as '13-1-20'. Reason (R): In strict forward alphabetical coding, each letter is uniformly replaced by its exact sequential integer starting from A=1.

Question 17 of 20

What is the forward alphabetical position of the letter 'W'?

Question 18 of 20

In the context of opposite letter coding, which letter represents the opposite pair for 'D'?

Question 19 of 20

In a defined word substitution cipher: 'Cloud' translates to 'White', 'White' translates to 'Sky', 'Sky' translates to 'Blue', 'Blue' translates to 'Black', and 'Black' translates to 'Green'. If an individual wants to refer to the color of milk in this coded environment, which word must they use?

Question 20 of 20

Match List-I (Coding Method) with List-II (Example) correctly: List-I P. Forward Alphabetical Coding Q. Reverse Alphabetical Coding R. Opposite Letter Coding S. Symbol Coding List-II 1. A becomes Z, B becomes Y 2. A=1, B=2, C=3 3. A=$, B=*, R=@ 4. Z=1, Y=2, X=3

More Mental Ability Subtopics

Practice other subtopics under Mental Ability to strengthen your CET 12th Level preparation.