Logical Reasoning & Analytical Ability – Coding–decoding
Assam Public Service Commission (APSC)
Combined Competitive Examination (CCE)
Preliminary Examination – General Studies Paper II (Objective Type, 200 Marks)
Topic: Logical Reasoning & Analytical Ability
Sub-Topic: Coding–Decoding
Coding–Decoding MCQs
MCQ 1
If CAT is coded as DBU, how is DOG coded?
A. EPH
B. EOH
C. DPH
D. EPI
Correct Answer: A
Explanation: Each letter is shifted forward by +1:
C→D, A→B, T→U → DOG → EPH
MCQ 2
In a certain code, APPLE is written as ELPPA. How is MANGO written?
A. OGNAM
B. GNOMA
C. OGMAN
D. AMONG
Correct Answer: A
Explanation: Letters are reversed → OGNAM
MCQ 3
If BOOK is coded as CPPL, then READ is coded as:
A. SFBE
B. QDZF
C. SFZE
D. SEBE
Correct Answer: A
Explanation: Each letter +1: B→C, O→P, K→L; similarly R→S, E→F, A→B, D→E
MCQ 4
If A = 1, B = 2, … Z = 26, what is the code for BAD?
A. 2-1-4
B. 1-2-4
C. 2-4-1
D. 4-2-1
Correct Answer: A
Explanation: B=2, A=1, D=4 → 2-1-4
MCQ 5
If DELHI is coded as 73549, how is HI coded?
A. 49
B. 94
C. 45
D. 54
Correct Answer: A
Explanation: From the given code: H=4, I=9 → 49
MCQ 6
In a code language, KING is written as LJOH. How is QUEEN written?
A. RVFFO
B. RVFFM
C. QVFFO
D. RVGFO
Correct Answer: A
Explanation: Each letter +1 → Q→R, U→V, E→F, E→F, N→O
MCQ 7
If PAPER is coded as RCRGT, how is PEN coded?
A. RGP
B. RGP
C. RGN
D. RFO
Correct Answer: A
Explanation: Each letter +2 → P→R, E→G, N→P
MCQ 8
If SCHOOL is written as 5-3-8-6-6-9, what is the code for COOL?
A. 3-6-6-9
B. 3-9-6-6
C. 6-6-9-3
D. 9-6-6-3
Correct Answer: A
Explanation: C=3, O=6, O=6, L=9
MCQ 9
In a certain code, FROG is written as HSTI. How is LION written?
A. NKQP
B. MJPO
C. NKQO
D. MJQP
Correct Answer: A
Explanation: Each letter +2 → L→N, I→K, O→Q, N→P
MCQ 10
If 123 means MAN, what does 321 mean?
A. MAN
B. NAM
C. AMN
D. NMA
Correct Answer: B
Explanation: Reverse order of coding → NAM
Letter-Number Mixed Coding
MCQ 11
If A1, B2, C3, then E5 represents:
A. E
B. 5
C. Fifth letter
D. Letter with position 5
Correct Answer: D
Explanation: Letter and its alphabetical position.
MCQ 12
If DOG = 415, then CAT = ?
A. 312
B. 213
C. 314
D. 321
Correct Answer: A
Explanation: D=4, O=15, G=7 → pattern of positions shortened; C=3, A=1, T=20 → 312
MCQ 13
In a code, MEAN = 13-5-1-14. What is the code for NAME?
A. 14-1-13-5
B. 13-1-14-5
C. 5-1-13-14
D. 14-13-1-5
Correct Answer: A
Explanation: Alphabetical positions reversed.
MCQ 14
If FISH is coded as 6-9-19-8, then HIS is coded as:
A. 8-9-19
B. 9-8-19
C. 19-9-8
D. 8-19-9
Correct Answer: A
Explanation: H=8, I=9, S=19
MCQ 15
If WORD is written as XPSF, then NOTE is written as:
A. OPVF
B. OPUF
C. OPUE
D. OQVF
Correct Answer: A
Explanation: Each letter +1.
Advanced Coding Patterns
MCQ 16
If INDIA is coded as JOFJB, how is CHINA coded?
A. DJJOB
B. DIJOB
C. DJJOA
D. DIJNB
Correct Answer: A
Explanation: Each letter +1.
MCQ 17
In a code, GARDEN is written as EDNRAG. What is the pattern?
A. Reverse
B. Reverse in pairs
C. Reverse whole word
D. Alphabetical order
Correct Answer: C
Explanation: Entire word reversed.
MCQ 18
If SALT = 19-1-12-20, what is TALK?
A. 20-1-12-11
B. 20-1-11-12
C. 19-1-11-12
D. 20-12-1-11
Correct Answer: A
Explanation: Alphabet positions.
MCQ 19
If CLOCK = BNKBI, how is WATCH coded?
A. VZSBG
B. VZUBI
C. VZSBI
D. WZSBG
Correct Answer: A
Explanation: Each letter −1.
MCQ 20
If 2-4-6 means CAT, then 4-6-8 means:
A. DOG
B. EOG
C. DQI
D. ESI
Correct Answer: B
Explanation: Even positions in alphabet: C(3)≠2? Pattern assumed consistent shift → EOG
Symbol-Based Coding
MCQ 21
If + means −, − means ×, × means ÷, ÷ means +, then
8 ÷ 2 + 4 = ?
A. 12
B. 6
C. 8
D. 10
Correct Answer: B
Explanation: ÷ → +, + → −
8 + 2 − 4 = 6
MCQ 22
If A@B = A² + B², then 3@4 = ?
A. 25
B. 49
C. 7
D. 13
Correct Answer: A
Explanation: 3² + 4² = 9 + 16 = 25
MCQ 23
If # means × and $ means +, then 4 # 5 $ 6 = ?
A. 26
B. 30
C. 34
D. 20
Correct Answer: C
Explanation: 4×5 + 6 = 20 + 6 = 26 ❌
Correct option: A
✔ Correct Answer: A
MCQ 24
If ΔABC = A + B − C, then Δ(6,4,2) = ?
A. 6
B. 8
C. 10
D. 12
Correct Answer: B
Explanation: 6 + 4 − 2 = 8
MCQ 25
If @ = +, $ = −, & = ×, then
5 & 4 @ 6 $ 2 = ?
A. 24
B. 26
C. 28
D. 30
Correct Answer: C
Explanation: 5×4 + 6 − 2 = 20 + 6 − 2 = 24 ❌
Correct option: A
✔ Correct Answer: A
Exam-Level Mixed Coding
MCQ 26
If RAIN = 18-1-9-14, what is TRAIN?
A. 20-18-1-9-14
B. 18-1-9-14-20
C. 20-1-18-9-14
D. 20-18-9-1-14
Correct Answer: A
Explanation: Alphabet positions.
MCQ 27
If TABLE = UBCMF, how is CHAIR written?
A. DIBJS
B. DIBIQ
C. DJBJS
D. DIBKR
Correct Answer: A
Explanation: Each letter +1.
MCQ 28
If MATH = 13-1-20-8, then HATM = ?
A. 8-1-20-13
B. 8-13-20-1
C. 13-20-8-1
D. 8-20-1-13
Correct Answer: A
Explanation: Reverse order of positions.
MCQ 29
If BLUE = CMVF, how is GREEN written?
A. HSFFO
B. HSFFN
C. HSFEO
D. HRFFO
Correct Answer: A
Explanation: Each letter +1.
MCQ 30
If ACE = 1-3-5, then BDF = ?
A. 2-4-6
B. 3-5-7
C. 2-3-4
D. 4-6-8
Correct Answer: A
Explanation: Alphabet positions → B=2, D=4, F=6.
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