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Coding Decoding MCQs
High-yield multiple choice questions asked in previous years (UPSC, SSC CGL, JKSSB, RRB & State PSCs).
High-Yield Concept Capsule & Key Facts
📌 Standard high-yield reasoning section testing alphabetical pattern recognition in SSC, RRB, Banking, and Police SI.
Essential Coding Methodologies
- • Letter Coding: Forward (+1, +2, +3) and backward (-1, -2, -3) alphabetical positional shifting.
- • Opposite Letter Pairs: Sum of positions equals 27 (A-Z, B-Y, C-X, D-W, E-V, F-U, G-T, H-S, I-R, J-Q, K-P, L-O, M-N).
- • Direct Coding: Specific digits/symbols assigned to letters based on consistent positions across multiple example words.
- • Chinese / Message Substitution: Common words identified across 3-4 sentence strings through elimination of common code terms.
Positional Memorization Formulae: EJOTY & VQLGB
- • EJOTY Formula: E(5), J(10), O(15), T(20), Y(25) provides anchor points for rapid forward position indexing.
- • CFILORUX Formula: C(3), F(6), I(9), L(12), O(15), R(18), U(21), X(24) enables instant multiples of 3 calculation.
- • Reverse Position Formula: Reverse Rank = 27 - Forward Rank (e.g., Reverse of G(7) = 27 - 7 = 20 = T).
| Type of Coding | Example Input | Logic Applied | Output |
|---|---|---|---|
| Forward Shift (+1) | MADRAS | Each letter +1 | NBESBT |
| Opposite Letter (Sum 27) | ROSE | R-I, O-L, S-H, E-V | ILHV |
| Reversal of Halves | FRACTION | FRAC->CARF, TION->NOIT | CARFNOIT |
| Positional Sum | CAT | C(24)+A(26)+T(7) [Reverse] | 57 |
| Fictitious Language | ta ka pa | Eliminate common word 'more' | ka = more |
Showing 15 Practice Questions
Q1SSC CGL Tier-1 2022Easy
In a certain code language, if 'MADRAS' is coded as 'NBESBT', how will 'BOMBAY' be coded in that same language?
Q2RRB NTPC CBT-1 2021Easy
If 'DELHI' is coded as '73541' and 'CALCUTTA' is coded as '82589662', how can 'CALICUT' be coded?
Q3SSC CHSL 2021Medium
If 'SYSTEM' is written as 'SYSMET' and 'NEARER' is written as 'AENRER', how will 'FRACTION' be written?
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Q4IBPS Clerk 2022Easy
In a certain code, '253' means 'books are old', '546' means 'man is old' and '378' means 'buy good books'. Which digit stands for 'are'?
Q5SSC CGL Tier-1 2023Medium
If A = 26, SUN = 27, then CAT = ?
Q6SBI PO Prelims 2022Hard
If 'ORANGE' is coded as 'PTDPII', how is 'LEMON' coded in that same pattern?
Q7JKSSB Police Constable 2022Easy
If 'water' is called 'food', 'food' is called 'tree', 'tree' is called 'sky', 'sky' is called 'wall', on which of the following does a fruit grow?
Q8SSC CPO 2022Medium
If in a code language, 'ROSE' is written as 'ILHV', how will 'MILK' be coded?
Q9RRB NTPC 2022Easy
In a code, 'TEACHER' is written as 'VGCEJGT'. What will be the code for 'CHILDREN'?
Q10SSC MTS 2022Easy
If 'GLARE' is coded as '67810' and 'MONSOON' is coded as '2395339', how will 'RANSOM' be coded?
Q11IBPS RRB Clerk 2021Medium
If 'LEAD' is coded as '20', how will 'TAIL' be coded under the same logic?
Q12AFCAT 2023Hard
In a military cipher, 'VICTORY' is written as 'CIVSYRO'. How is 'SUCCESS' written in that cipher?
Q13SSC CGL Tier-1 2022Medium
If 'AIR' is coded as '28', what is the code for 'BREEZE'?
Q14JKSSB Junior Assistant 2021Easy
In a code, 'no more food' is written as 'ta ka pa' and 'more than that' is written as 'sa ka da'. Which word represents 'more'?
Q15SSC CGL 2023Easy
If 'ZEBRA' is written as '2652181', how will 'COBRA' be written?
Frequently Asked Questions (Coding Decoding)
Q: What is the best way to speed up solving coding-decoding questions in timed tests?
Write down the forward and reverse letters A-Z (1 to 26) with their opposite pairs (A-Z, B-Y... M-N) on your rough sheet during the initial 2-minute exam instruction window.
Q: What are new pattern coding questions in banking mains exams?
In banking mains, codes combine three components: (1) a letter representing the first/last letter or total vowels, (2) a number representing word length, and (3) a symbol representing the first character category.
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