Coding–Decoding — Practice

Question 1

In a certain code, GARDEN is written as JDUGHQ. How is FOREST written?
(a) IRUHVW  (b) IRUHVX  (c) IRUGVW  (d) IRUHUW

Accepted Answer

G→J is +3; verify all: A→D, R→U, D→G, E→H, N→Q — uniform +3.

F+3=I, O+3=R, R+3=U, E+3=H, S+3=V, T+3=W → IRUHVW.

Answer: (a) IRUHVW.

Question 2

If MONITOR is coded as ROTINOM, how is KEYBOARD coded?
(a) DRAOBYEK  (b) DRABOYEK  (c) DROABYEK  (d) DRAOBEYK

Accepted Answer

The code is the word reversed.

KEYBOARD reversed = DRAOBYEK.

Answer: (a) DRAOBYEK. (Letter-by-letter on paper — options differ by one swap precisely to catch mental reversal.)

Question 3

In a code, LAMP is written as OZNK. How is DESK written?
(a) WVHP  (b) WVGP  (c) XVHP  (d) WUHP

Accepted Answer

L(12)+O(15) = 27, A(1)+Z(26) = 27 — mirror cipher (27-sum).

D(4)→W(23), E(5)→V(22), S(19)→H(8), K(11)→P(16) → WVHP.

Answer: (a) WVHP.

Question 4

If CLOUD is coded as DNRYI, what is the code for MUSIC?
(a) NWVMH  (b) NWVLH  (c) NVVMH  (d) NWUMH

Accepted Answer

Gaps: C→D +1, L→N +2, O→R +3, U→Y +4, D→I +5.

M+1=N, U+2=W, S+3=V, I+4=M, C+5=H → NWVMH.

Answer: (a) NWVMH.

Question 5

In a code, BAT = 23 and CAB = 6. What is the code for DOG?
(a) 26  (b) 30  (c) 45  (d) 52

Accepted Answer

Plain sums: BAT = 2+1+20 = 23 ✓; CAB = 3+1+2 = 6 ✓ — plain positional sum.

DOG = 4+15+7 = 26.

Answer: (a) 26. (Both examples fit the plain sum, so no variant needed.)

Question 6

'lo ta pi' means 'books are heavy'; 'pi na mo' means 'heavy rains came'; 'ta su na' means 'books and rains'. What is the code for 'are'?
(a) lo  (b) ta  (c) pi  (d) na

Accepted Answer

Intersect: 'heavy' in sentences 1&2 → pi. 'books' in 1&3 → ta. 'rains' in 2&3 → na.

Sentence 1's leftover: 'are' = lo.

Answer: (a) lo.

Question 7

If 5 * 3 = 16, 7 * 2 = 18 and 9 * 4 = 26, then 8 * 5 = ?
(a) 24  (b) 26  (c) 30  (d) 40

Accepted Answer

Test hypotheses against ALL three examples.

ab + 1: 5×3+1 = 16 ✓ but 7×2+1 = 15 ≠ 18 ✗ — discard.

2(a + b): 2(8) = 16 ✓, 2(9) = 18 ✓, 2(13) = 26 ✓ — fits all three.

8 * 5 = 2(8 + 5) = 26.

Answer: (b) 26. The first example alone supported ab + 1 — one fit is a hypothesis, three fits is an answer.

Question 8

If A = 26, B = 25 … Z = 1, then the code for FAN is:
(a) 21-26-13  (b) 21-26-12  (c) 20-26-13  (d) 21-25-13

Accepted Answer

Reverse position = 27 − normal position.

F: 27−6 = 21; A: 27−1 = 26; N: 27−14 = 13.

Answer: (a) 21-26-13.

Question 9

In a code, XRAY is written as BVEC. How is ZERO written?
(a) DIVS  (b) DIVR  (c) CIVS  (d) DHVS

Accepted Answer

X(24)→B(2): +4 with wrap (24+4=28→2). Verify: R→V +4, A→E +4, Y(25)→C(3) +4 ✓.

Z(26)+4 = 30 → 4 = D; E+4 = I; R+4 = V; O+4 = S → DIVS.

Answer: (a) DIVS.

Practice — Coding–Decoding

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