Question 1

In a certain coding system, each letter is replaced by the letter that comes 3 positions after it in the English alphabet. For example, A is coded as D, B is coded as E, and so on. Using this rule, how will the word 'BANK' be coded?

Accepted Answer

Apply the +3 letter shift rule to each letter: B→E, A→D, N→Q, K→N. The coded word is EDQN.

Question 2

In a code, the numbers 1, 2, 3, 4, 5 represent the vowels A, E, I, O, U respectively. Consonants are represented by the letter itself. Using this rule, decode the following: 'H1LL2'.

Accepted Answer

Replace each number with its corresponding vowel: 1→A, 2→E. H remains H, L remains L. The decoded word is 'HALLE'.

Question 3

In a certain code, if FRIEND is written as GSKFOE, what is the pattern used? (Hint: Each letter is shifted by a fixed number of positions.)

Accepted Answer

Compare each letter: F→G (+1), R→S (+1), I→K (+2), E→F (+1), N→O (+1), D→E (+1). Wait, I→K is +2. Let me recheck: F→G(+1), R→S(+1), I→K(+2)... This is inconsistent. Let me verify the question: FRIEND → GSKFOE. Actually, checking position by position: F(6)→G(7)=+1, R(18)→S(19)=+1, I(9)→K(11)=+2, E(5)→F(6)=+1, N(14)→O(15)=+1, D(4)→E(5)=+1. The pattern is: +1, +1, +2, +1, +1, +1. This is irregular. Let me reconsider: perhaps the pattern is +1 for all except position 3 which is +2.

Question 4

In a code language, vowels are written in reverse order (A↔U, E↔O, I stays I) and consonants remain unchanged. If 'SMILE' is coded using this rule, what is the code?

Accepted Answer

Apply the vowel reversal rule: S(consonant)→S, M(consonant)→M, I(vowel, stays I)→I, L(consonant)→L, E(vowel, E↔O)→O. The code is 'SMILO'.

Question 5

In a coding system, each letter's position in the word is multiplied by 2, and the result is written as a number. For example, the 1st letter gets code 2 (1×2), the 2nd letter gets code 4 (2×2), and so on. If 'CAT' is coded as C2A4T6, what will 'DOG' be coded as?

Accepted Answer

Apply the position-based numbering rule: D is at position 1 (1×2=2), O is at position 2 (2×2=4), G is at position 3 (3×2=6). The code is 'D2O4G6'.

Question 6

In a certain coding system, each letter is replaced by the letter that comes 3 positions after it in the English alphabet. For example, A is coded as D, B is coded as E, and so on. Letters after X wrap around to the beginning (Y→B, Z→C). Using this rule, what is the code for the word 'PLAY'?

Accepted Answer

Apply the +3 letter shift rule consistently to each letter: P→S, L→O, A→D, Y→B. The coded word is SODB.

Question 7

In a code, consonants are replaced by the next consonant in alphabetical order, and vowels are replaced by the previous vowel in alphabetical order (with A wrapping to U). What is the code for 'SMILE'?

Accepted Answer

S→T (next consonant), M→N (next consonant), I→E (previous vowel), L→M (next consonant), E→A (previous vowel). Code: TNEMA.

Question 8

In a code, vowels are replaced by the number representing their position in the vowel sequence (A=1, E=2, I=3, O=4, U=5), and consonants remain unchanged. What is the code for 'PHONE'?

Accepted Answer

P stays P (consonant), H stays H, O→4 (4th vowel), N stays N, E→2 (2nd vowel). Code: PH4N2.

Question 9

In a certain code, the first and last letters of a word are swapped, then each remaining letter is replaced by the letter 2 positions before it in the alphabet. What is the code for 'GARDEN'?

Accepted Answer

Step 1: Swap first (G) and last (N) → NARDEG. Step 2: Keep N and G, shift A→Y, R→P, D→B, E→C → NyPBCG. Wait, recalculate: N stays, A→Y, R→P, D→B, E→C, G stays = NYPBCG.

Question 10

In a certain coding system, each letter is replaced by the letter that comes 3 positions after it in the alphabet (with Z wrapping to C). Using this rule, what is the code for the word 'BANK'?

Accepted Answer

Apply the +3 letter shift rule to each letter: B→E, A→D, N→Q, K→N. The coded word is EDQN.

Question 11

In a code, each letter is assigned a value: A=1, B=2, C=3... Z=26. A word is coded by summing the values of all its letters. If 'CAT' codes to 24, what is the code for 'DOG'?

Accepted Answer

Verify CAT: C=3, A=1, T=20. Sum = 3+1+20 = 24 ✓. For DOG: D=4, O=15, G=7. Sum = 4+15+7 = 26.

IBPS RRB PO Coding Decoding

Coding Decoding— Rules & Concept

Key Points to Remember

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Coding Decoding — Practice Questions

60-Second Revision — Coding Decoding