Coding-Decoding Questions and Answers

Answer: D

The answer is None of these.

In EAGER = 51759 each letter is replaced by its alphabet position, and a two-digit position is reduced to the sum of its digits: E = 5, A = 1, G = 7, E = 5, R = 18, and 1 + 8 = 9.

The same rule gives CADET as C = 3, A = 1, D = 4, E = 5, T = 20 (2 + 0 = 2), that is 31452. None of 31547, 34157 or 31457 matches.

Answer: C

NORTH is written as GSQNM.

The code reverses the word and then moves every letter one place back in the alphabet. HEALTH reversed is H T L A E H, and one step back gives G S K Z D G (A moves back to Z), which matches the given code.

Applying the same rule, NORTH reversed is H T R O N, and one step back gives G S Q N M.

PRMFL, SPIUO and ISPUO come from shifting the letters forward or keeping the original order; none follows both steps of the rule.

Answer: B

DELHI is related to CDKGH.

Each letter of MUMBAI moves one place back in the alphabet: M to L, U to T, M to L, B to A, A to Z, I to H, giving LTLAZH.

The same rule turns D E L H I into C D K G H.

HILED simply reverses the word, BCKGH moves the first two letters back by two instead of one, and CDGKG changes the order of the middle letters, so none keeps the one-step-back rule for every letter.

Answer: C

A possible decode of YZXP is BACK.

The code replaces each letter by its mirror image in the alphabet, the letter the same distance from the other end: A and Z, B and Y, C and X, and so on, so that the positions of each pair add up to 27. Checking CABLE: C to X, A to Z, B to Y, L to O and E to V gives XZYOV, as stated.

Decoding YZXP the same way: Y to B, Z to A, X to C and P to K, which spells BACK. BABY would be coded YZYB, CELL as XVOO and BELL as YVOO, none of which is YZXP.

Answer: C

GATE is coded as 5247.

Each letter has its own fixed digit. From GIVE = 5137: G = 5, I = 1, V = 3, E = 7. From BAT = 924: B = 9, A = 2, T = 4.

So GATE = G, A, T, E = 5, 2, 4, 7, which is 5247.

The other options use the same four digits in the wrong order: 5427 swaps A and T, 5724 puts E second, and 2547 starts with A instead of G.

Such questions test whether each letter keeps the same digit wherever it appears; every letter of GATE also occurs in GIVE or BAT, so no guessing is needed.

Answer: B

Correct answer: CPNCBZ

Each letter advances one place: MADRAS becomes NBESBT. BOMBAY therefore gives B→C, O→P, M→N, B→C, A→B, Y→Z, the Y wrapping round to Z. Since B appears twice in BOMBAY, C must appear twice in the code, which is true of every option here - the final letter is what separates them.

Answer: B

The alphabets are soded as shown :

N is coded as 2,
E as 1,
A as 7,
T as 3   and
S as 9.
So, NEATNESS is coded as 21732199.

Answer: B

Explanation:

Clearly,

T -1 = S
A -1 = Z
P -1 = O

So FREEZE will be,

F -1 E
R -1 Q
E -1 D
E -1 D
Z -1 Y
E -1 D

Answer: C

In the given codes, the numbers are coded as shown :
 

i.e., 2 as A,
3 as L,
5 as G,
4 as U   and
9 as T.
So, 23549 is coded as ALGUT.
 

Answer: A

The alphabets are coded as shown :

So, in PILLER,
P is coded as 3,
I as 1,
L as 8,
E as 2   and
R as 6.
Thus, the code for PILLER is 318826.