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Rajasthan SI — Coding-Decoding MCQs

Practice 20 free coding-decoding multiple choice questions for Rajasthan SI exam. Instant answers with explanations in Hindi and English.

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

Rajasthan SI — Mental Ability — Coding-Decoding

20 Questions • Instant results & explanations • Hindi & English

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Question 1 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 2 of 20

If a coding system substitutes words such that 'Cloud' is called 'White', 'White' is called 'Sky', 'Sky' is called 'Blue', 'Blue' is called 'Black', and 'Black' is called 'Green', what is the color of an elephant in this system?

Question 3 of 20

Why is the strategy of memorizing specific coding rules (e.g., A always equals 1) generally considered completely useless by examination experts?

Question 4 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 5 of 20

Assertion (A): If a coding logic dictates that A becomes E and C becomes G, then the letter M will logically be coded as Q. Reason (R): The applied coding logic consistently shifts the original letter forward by exactly 4 alphabetical positions.

Question 6 of 20

Using the reverse alphabetical numerical coding system where Z=1, Y=2, and X=3, what will be the numerical code for the word 'BAY'?

Question 7 of 20

If a symbolic coding rule is established where A = $, B = *, R = @, and M = %, what will be the decoded meaning of the string '@$%'?

Question 8 of 20

If in a specific language, the sequence of the alphabet is divided into two halves, what is the numerical positional value of the letter 'N' in standard forward coding?

Question 9 of 20

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

Question 10 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 11 of 20

What is the fundamental purpose of the process known as 'coding'?

Question 12 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 13 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 14 of 20

If a decoding program is fed the sequence '@@$$' and operates using the substitution key (A=$, R=@), what meaningful output will the program generate?

Question 15 of 20

Assertion (A): In opposite letter coding, the sum of the standard forward numerical positions of a paired letter combination is always 27. Reason (R): 'C' and 'X' form an opposite letter pair in the English alphabet.

Question 16 of 20

What is the specialized term for the cognitive and systematic process of converting a seemingly arbitrary numerical sequence like '20-1-14-21' back into the meaningful name 'TANU'?

Question 17 of 20

Consider the following statements regarding the rules of coding: I. It is highly useful to memorize all coding rules in advance to solve questions. II. Every coding question typically employs a distinct and unique rule. Which of the statements is correct?

Question 18 of 20

Assertion (A): The sequence 'Z-1, Y-2, X-3' represents a reverse alphabetical coding rule. Reason (R): Reverse alphabetical coding assigns the highest numerical value (26) to the first letter of the alphabet (A).

Question 19 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 20 of 20

If 'RAM' is coded as '@$%' and 'M' is represented by '%', what can be logically deduced about the code for 'MAR'?

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