Tayari24

Coding-Decoding MCQs for Rajasthan SI

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

Master Coding-Decoding under Mental Ability for Rajasthan SI 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.

Rajasthan SI — Mental Ability — Coding-Decoding

20 Questions • Instant results & explanations • Hindi & English

0 / 20
Question 1 of 20

Consider a word substitution cipher: 'Cloud' is 'White', 'White' is 'Sky', 'Sky' is 'Blue'. If a person wants to look at the atmosphere above the earth during a clear day, what will they look at according to this cipher?

Question 2 of 20

Consider the following statements regarding the prerequisites for a successful encrypted communication: I. The sender must convert meaningful text into an obscure format using a specific predefined rule. II. The receiver must know the exact same predefined rule to accurately retrieve the original information. Which of the statements is/are correct?

Question 3 of 20

When a person attempts a coding-decoding examination question, why is memorizing an example rule considered an ineffective strategy?

Question 4 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 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

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 7 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 8 of 20

According to the fundamental principles of reasoning, why is an un-coded message vulnerable?

Question 9 of 20

Which of the following scenarios perfectly illustrates the process of 'Decoding'?

Question 10 of 20

Given a completely arbitrary symbolic reference key where A = $, B = *, R = @, and M = %. If an intelligence operative transmits the code string '$%*@', what actual text is the receiver reading?

Question 11 of 20

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

Question 12 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 13 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 14 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 15 of 20

If a coding system utilizes the rule of 'Opposite Letters' (e.g., A corresponds to Z, B corresponds to Y), how will the word 'CAB' be coded?

Question 16 of 20

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

Question 17 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 18 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 19 of 20

If a symbolic coding rule is given as A=S, B=R, and M=%, what does this signify?

Question 20 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'?

More Rajasthan SI Practice