Coding-Decoding MCQs for Rajasthan SI
Practice 20 free Coding-Decoding questions under Mental Ability — Reasoning & Mental Ability.
Strengthen your Coding-Decoding knowledge for Rajasthan SI with curated MCQs. Switch between Hindi and English anytime.
Rajasthan SI — Mental Ability — Coding-Decoding
20 Questions • Instant results & explanations • Hindi & English
0 / 20
Question 1 of 20
Which of the following scenarios perfectly illustrates the process of 'Decoding'?
Question 2 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 3 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 4 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 5 of 20
If 'RAM' is coded as '@$%' and 'M' is represented by '%', what can be logically deduced about the code for 'MAR'?
Question 6 of 20
Match List-I (Coding Method) with List-II (Example) correctly: List-I P. Forward Alphabetical Coding Q. Reverse Alphabetical Coding R. Opposite Letter Coding S. Symbol Coding List-II 1. A becomes Z, B becomes Y 2. A=1, B=2, C=3 3. A=$, B=*, R=@ 4. Z=1, Y=2, X=3
Question 7 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 8 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 9 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 10 of 20
Using a defined word substitution sequence where 'Cloud' is 'White', 'White' is 'Sky', 'Sky' is 'Blue', 'Blue' is 'Black', and 'Black' is 'Green', what is the coded color of the ocean?
Question 11 of 20
In the standard forward alphabetical coding system, if 'M' equals 13 and 'D' equals 4, what is the numerical value of 'M minus D', and which letter does that resulting value represent?
Question 12 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 13 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 14 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 15 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 16 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 17 of 20
What is the fundamental purpose of the process known as 'coding'?
Question 18 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 19 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 20 of 20