Coding-Decoding Questions and Answers

Answer: D

Correct answer: CHRONRD

Each letter steps one place back, as TRIPPLE to SQHOOKD shows. DISPOSE therefore gives D→C, I→H, S→R, P→O, O→N, S→R, E→D, that is CHRONRD. The wrong options step forward instead, which turns the pattern the wrong way round throughout.

Answer: B

Correct answer: VXFFHVV

Each letter advances three places: V→Y, I→L, C→F, T→W, O→R, R→U, Y→B, the last wrapping past Z. SUCCESS gives S→V, U→X, C→F, C→F, E→H, S→V, S→V. The repeated letters again provide the check: the two C’s must give the same letter, and so must the three S’s.

Answer: A

Correct answer: NCPQJG

The shift alternates. Taking TOGETHER against RQEGRJCT: T→R is two back, O→Q two forward, G→E two back, E→G two forward, and so on in turn. PAROLE therefore gives P→N, A→C, R→P, O→Q, L→J, E→G, that is NCPQJG. Reading only the first letter would not distinguish this from a simple shift, which is why the alternation has to be checked along the whole word.

Answer: B

Correct answer: MNUMNUMNU

The code is built from every third letter. BOMBAY has six letters, and taking the third and the sixth gives M and Y, written three times over as MYMYMY. TAMILNADU has nine, so the third, sixth and ninth are M, N and U, and the code is MNU repeated three times.

Answer: A

Correct answer: EDRIRL

The shift increases along the word. FRIEND to HUMJTK is F+2, R+3, I+4, E+5, N+6, D+7. Applying the same increasing shift to CANDLE gives C+2=E, A+3=D, N+4=R, D+5=I, L+6=R, E+7=L, that is EDRIRL. A constant shift would not reproduce the example, so the differences must be worked out letter by letter.

Answer: B

The letters at odd positions are each moved one step backward, while the letters at even positions are respectively moved six, five, four, three, two,... steps backward to obtain the corresponding letters of the code.

Answer: C

Correct answer: NCPQJG

TOGETHER to RQEGRJCT alternates two places back and two forward: T→R, O→Q, G→E, E→G, T→R, H→J, E→C, R→T. PAROLE has six letters, so the pattern runs back, forward, back, forward, back, forward: P→N, A→C, R→P, O→Q, L→J, E→G, giving NCPQJG.

Answer: A

Correct answer: CAKNCA

Every letter moves four places back: J→F, O→K, S→O, E→A, P→L, H→D. GEORGE therefore gives G→C, E→A, O→K, R→N, G→C, E→A, that is CAKNCA. Since GEORGE has G and E twice each, the code must repeat C and A in the same places, which rules out three of the four options at a glance.

Answer: B

Correct answer: IQW

The shift grows by one at each position. COOL to DQRP is C+1, O+2, O+3, L+4 - note the two O’s give different letters, which is what shows the shift is not constant. HOT therefore gives H+1=I, O+2=Q, T+3=W.

Answer: C

In given word, word is divided into three parts like
COM+PLE+TED, then these parts are written in reverse order as

MOC+ELP+DET

So,

DIRECTION will be DIR+ECT+ION,
which will be RIDTCENOI