Coding-Decoding MCQs for LDC
Practice 20 free Coding-Decoding questions under Mental Ability — Reasoning & Mental Ability.
Strengthen your Coding-Decoding knowledge for LDC with curated MCQs. Switch between Hindi and English anytime.
LDC — Mental Ability — Coding-Decoding
20 Questions • Instant results & explanations • Hindi & English
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Question 1 of 20
If a code uses the logic of shifting to the '3rd letter ahead' (e.g., A becomes D), what will the letter 'P' become?
Question 2 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 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
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 5 of 20
What is the forward alphabetical position of the letter 'W'?
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
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 8 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 9 of 20
What is the fundamental characteristic of the output generated by the 'Coding' process?
Question 10 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 11 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 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
If the word 'RAM' is coded as '18-1-13', what is the specific rule applied in this coding system?
Question 14 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 15 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 16 of 20
In a word substitution coding system, 'Cloud' is called 'White', 'White' is called 'Sky', 'Sky' is called 'Blue', 'Blue' is called 'Black', and 'Black' is called 'Green'. According to this specific system, what brings rain to the earth?
Question 17 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 18 of 20
Which of the following is NOT a standard method of coding discussed in basic reasoning?
Question 19 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 20 of 20