Free Coding and Decoding MCQs with Answers
22 Coding and Decoding MCQs from Analytical and Logical Reasoning, each with the correct answer and a written explanation of why it is correct. Free and unlimited, with no account needed.
22 questions · page 3 of 3
21. If the word SCHOOL is coded by writing alternate letters starting from the first, the code is
- A. SHO
- B. COL
- C. SCO
- D. SHL
Explanation: Taking the first, third and fifth letters of S, C, H, O, O, L gives S, H and O. Starting from the second letter instead would give C, O and L, which is the alternative offered. Reading the instruction precisely, including where the count starts, decides between the two.
Correct answer: SHO22. In a certain code, the word LOGIC is written by shifting each letter forward by its own position in the word, so L moves one, O moves two and so on. The first three letters become
- A. MQJ
- B. MPJ
- C. NQK
- D. MQI
Explanation: L shifted forward by one gives M, O shifted by two gives Q, and G shifted by three gives J. Variable shifts of this kind are harder than a uniform Caesar shift and must be worked letter by letter. Writing the position number above each letter before shifting keeps the count straight.
Correct answer: MQJ