Coding-Decoding Questions and Answers

Answer: C

CLOCK is spelt as CMNCL.

Compare WATCH with WBSCI letter by letter:

The pattern of shifts is 0, +1, -1, 0, +1. Applying it to CLOCK: C stays C, L becomes M, O becomes N, C stays C, K becomes L, giving CMNCL.

The other options break the pattern: CKPCJ reverses every shift, CKNCJ moves L and K backwards instead of forwards, and CMNDJ changes the fourth letter, which should stay C, and moves K backwards.

Answer: B

'White' is coded as 4.

'256' (red colour chalk) and '254' (white colour chalk) share 2 and 5, which stand for 'colour' and 'chalk'. The digit that differs, 4 in place of 6, must stand for the word that differs, 'white' in place of 'red'.

'589' also contains 5 with 'colour', confirming that 5 is 'colour' and 2 is 'chalk'. 8 belongs to 'green' or 'flower'.

Coding-decoding questions like this are solved by comparing codes that share words: common words map to common digits.

Answer: C

FAMILY is coded as GBNJMZ.

Compare MOTHER with NPUIFS: M becomes N, O becomes P, T becomes U, H becomes I, E becomes F and R becomes S. Every letter moves one place forward in the alphabet.

Applying the same rule: F to G, A to B, M to N, I to J, L to M, Y to Z, giving GBNJMZ.

GNBJZM jumbles the order, GBNZMZ codes I as Z, and EBNJMX moves F and Y backwards.

Answer: C

We would drink fire.

We drink water, and in this code 'water' is called 'fire'. So the answer is the code name for water, which is fire.

'Water' is the real name, not the code. 'Sky' is the code for air, and 'earth' is the code for fire, so neither stands for water.

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.

Answer: B

The alphabets are soded as shown :

A is coded as 7,
R as 4,
E as 1,
S as 9   and
T as 3.
So, ARREST is coded as 744193.