Free Coding and Decoding MCQs with Answers
114 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.
Coding and decoding questions replace letters, numbers, words or symbols with another pattern and ask you to identify the rule or decode a new item. Methods include alphabet positions, shifts, reversals, substitution, rearrangement, numerical values and separate rules for different parts of a code.
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Read the Coding and Decoding notesFree MDCAT chapter notes with key terms114 questions · page 1 of 6
- A. EPH
- B. EPG
- C. DPH
- D. FQI
Explanation: Each letter moves forward one position in the alphabet: C→D, A→B, T→U. Applying the same rule to DOG gives D→E, O→P, G→H, which is EPH.
Correct answer: EPH- A. IFBSU
- B. IFBTU
- C. GDZQS
- D. IEBSU
Explanation: Each letter is replaced by the one immediately after it in the alphabet, so M becomes N, E becomes F and so on.
Correct answer: IFBSU- A. EPH
- B. CNF
- C. EPG
- D. DPH
Explanation: Each letter moves one place forward in the alphabet, so C becomes D, A becomes B and T becomes U.
Correct answer: EPH- A. KHKX
- B. MJMZ
- C. KHLX
- D. KIKX
Explanation: Every letter moves one place backward, since R becomes Q, O becomes N, S becomes R and E becomes D.
Correct answer: KHKX- A. 6
- B. 5
- C. 7
- D. 4
Explanation: C is 3, A is 1 and B is 2, and adding them gives 6. Positional coding of this kind is the basis for many number letter questions, so…
Correct answer: 6- A. each letter moves two places forward
- B. each letter moves two places backward
- C. each letter moves one place forward
- D. the letters are reversed
Explanation: T becomes V, E becomes G and A becomes C, each a gap of two places forward, and the same holds for the rest of the word.
Correct answer: each letter moves two places forward- A. each letter is shifted forward
- B. the word is written in reverse order
- C. vowels are replaced by consonants
- D. alternate letters are swapped
Explanation: Reading PAPER backwards gives REPAP exactly, with no letter changed. Reversal codes are recognised by the fact that the same set of…
Correct answer: the word is written in reverse order- A. 3-1-16
- B. 3-2-16
- C. 2-1-16
- D. 3-1-15
Explanation: Each letter is replaced by its position in the alphabet, so C is 3, A is 1 and P is 16.
Correct answer: 3-1-16- A. NPPO
- B. LNNM
- C. NPPN
- D. NOOP
Explanation: Each letter advances by one, so M becomes N, both Os become Ps and N becomes O.
Correct answer: NPPO- A. pit
- B. na
- C. som
- D. jo
Explanation: The first two phrases share only the word water in meaning and only na in code, so na must be water.
Correct answer: na- A. water
- B. drinks
- C. is
- D. me
Explanation: The phrase means bring cold drinks, and with som as bring and jo as cold, the only word left is ho, which must be drinks.
Correct answer: drinks- A. HDUWK
- B. BXOQE
- C. HDUWJ
- D. FBSUI
Explanation: E becomes H, A becomes D, R becomes U, T becomes W and H becomes K, each three places forward.
Correct answer: HDUWK- A. one place forward
- B. one place backward
- C. two places backward
- D. reversal of the word
Explanation: D becomes C, E becomes D, L becomes K, H becomes G and I becomes H, each one place backward.
Correct answer: one place backward- A. every letter moves forward one place
- B. consonants move forward and vowels move backward one place
- C. every letter moves backward one place
- D. the word is reversed
Explanation: L becomes M and M becomes N, both forward, but A becomes Z and P becomes O, which is backward, so the rule depends on whether the letter…
Correct answer: consonants move forward and vowels move backward one place- A. 1111
- B. 112
- C. 1112
- D. 121
Explanation: Each digit is added to give a sum, which is then written twice, so 2 plus 4 is 6 giving 66, and 3 plus 5 is 8 giving 88.
Correct answer: 1111- A. 18
- B. 81
- C. 90
- D. 99
Explanation: Each number is squared, since 5 squared is 25 and 6 squared is 36, so 9 becomes 81.
Correct answer: 8117. If PEN is coded as 35 by adding the alphabet positions of its letters, what is the code for CAT?
- A. 24
- B. 26
- C. 27
- D. 23
Explanation: C is 3, A is 1 and T is 20, so the sum is 24. Checking the example, P is 16, E is 5 and N is 14, which sums to 35 and confirms the rule.
Correct answer: 24- A. two places forward
- B. three places forward
- C. three places backward
- D. one place forward
Explanation: M becomes P, O becomes R, T becomes W, H becomes K, E becomes H and R becomes U, every letter advancing by three.
Correct answer: three places forward- A. the letter three places ahead
- B. the letter three places behind
- C. its opposite letter in the alphabet, A for Z and B for Y
- D. the next vowel
Explanation: B pairs with Y, A with Z and T with G, each letter being replaced by its mirror image counting from the other end of the alphabet.
Correct answer: its opposite letter in the alphabet, A for Z and B for Y- A. GJSF
- B. EHQD
- C. GJSG
- D. GKSF
Explanation: Each letter advances by one, so F becomes G, I becomes J, R becomes S and E becomes F.
Correct answer: GJSFCoding and Decoding MCQs: common questions
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