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Coding-Decoding MCQs for RAS

Practice 20 free coding-decoding multiple choice questions for RAS exam. Instant answers, explanations in Hindi and English, and topic-wise targeted practice.

Master Coding-Decoding under Mental Ability for RAS with our curated MCQ set. Every question is sourced from real Rajasthan exam patterns and updated regularly. Switch between Hindi and English anytime. Use this daily to strengthen weak areas before the exam.

RAS — 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

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 3 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 4 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 5 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 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

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

Question 8 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 9 of 20

Consider the following statements regarding the shifting of letters (e.g., A -> E): I. It involves replacing a letter with another letter located at a specific forward or backward distance in the alphabet. II. It requires memorizing the word 'Cloud is White'. Which of the statements is correct?

Question 10 of 20

Assertion (A): In word substitution coding, factual real-world knowledge is necessary but not sufficient to answer the question. Reason (R): The final answer must always be derived by passing the real-world fact through the artificial substitution rule provided in the problem.

Question 11 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 12 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 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

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

Question 15 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 16 of 20

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

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

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

Question 19 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 20 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?

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