Coding Decoding Aptitude MCQ Questions with Answers Set 03

Answer: (c) LNTKCHMF

Explanation:
1. C to B, O to N, U to T: each letter is replaced by the letter just before it.
2. MOULDING: M to L, O to N, U to T, L to K, D to C, I to H, N to M, G to F.
3. So MOULDING is written as LNTKCHMF.

Teacher's Note:
1. Write the alphabet with position numbers (A=1 ... Z=26) once on rough paper; it makes every shift instant.
2. Check the shift on two or three letters of the given pair before applying it, and remember Z wraps round to A.

Answer: (b) L

Explanation:
1. CONTRIBUTE read backwards is ETUBIRTNOC, so the word is simply reversed.
2. POPULARISE reversed is ESIRALUPOP.
3. The 6th letter from the left is L.

Teacher's Note:
1. Check first whether the code is just the word written backwards; it is a very common pattern.
2. Count positions carefully on the coded word, not on the original word.

Answer: (c) @ % # & 2 @

Explanation:
1. From PRAISE: P = #, R = @, A = &, I = 2, S = 7, E = %; RESPIRE confirms these.
2. REPAIR = R E P A I R = @ % # & 2 @.

Teacher's Note:
1. Make a small letter-to-code table from the given words; most questions need no rule at all.
2. Look at the options and check only the positions where they differ, to save time.

Answer: (b) 35

Explanation:
1. HOTEL: 8 + 15 + 20 + 5 + 12 = 60, and 60 - 5 = 55. So code = (sum of letter positions) - 5.
2. BORE: 2 + 15 + 18 + 5 = 40, and 40 - 5 = 35.

Teacher's Note:
1. For number codes, try letter positions first: sum, product, or each position plus or minus a fixed value.
2. Test your rule on the whole given word before using it on the new one.

Answer: (b) QLPNMF

Explanation:
1. Match digit to letter: 1 = A, 3 = Q, 4 = F, 7 = J, 9 = L, 5 = D, 2 = M, 6 = P, 8 = N.
2. 396824 = Q L P N M F.

Teacher's Note:
1. Make a small letter-to-code table from the given words; most questions need no rule at all.
2. Look at the options and check only the positions where they differ, to save time.

Answer: (c) needle

Explanation:
1. A fountain pen is fitted with a nib.
2. In this language 'nib' is called 'needle', so the answer is 'needle'.

Teacher's Note:
1. In substitution questions, first find the real answer, then give its new name.
2. Do not answer with the real word; the trap option is usually the real object.

Answer: (a) ka de re

Explanation:
1. 'is' is common to the first two sentences and 're' is common to their codes, so is = re.
2. 'book' is common to sentences 1 and 3, codes share 'si', so book = si and interesting = ka.
3. 'bag' = ti (sentences 2 and 4), so that = de. Hence 'that is interesting' = de re ka, i.e. 'ka de re'.

Teacher's Note:
1. Compare two sentences that share exactly one word; the code they share is that word's code.
2. If two words always appear together, their codes cannot be told apart, so the answer is 'cannot be determined'.

Answer: (b) YCVGT

Explanation:
1. X to Z, E to G, R to T: every letter is moved two places forward.
2. W to Y, A to C, T to V, E to G, R to T, so WATER = YCVGT.

Teacher's Note:
1. Make a small letter-to-code table from the given words; most questions need no rule at all.
2. Look at the options and check only the positions where they differ, to save time.

Answer: (a) ENQUG

Explanation:
1. Every letter of the message is moved two places forward (X to Z, O to Q, S to U).
2. C to E, L to N, O to Q, S to U, E to G, so CLOSE = ENQUG.

Teacher's Note:
1. Make a small letter-to-code table from the given words; most questions need no rule at all.
2. Look at the options and check only the positions where they differ, to save time.

Answer: (b) press

Explanation:
1. Read each code letter in the table: J = p, Y = r, P = e, Z = s.
2. So JYPZZ decodes to 'press'.

Teacher's Note:
1. Decoding with a key table needs no pattern; just read each letter carefully.
2. Eliminate options as soon as one letter does not match.

Answer: (d) height

Explanation:
1. Read each code letter in the table: Q = h, P = e, M = i, N = g, B = t.
2. So QPMNQB decodes to 'height'.

Teacher's Note:
1. Decoding with a key table needs no pattern; just read each letter carefully.
2. Eliminate options as soon as one letter does not match.

Answer: (a) sphere

Explanation:
1. Read each code letter in the table: Z = s, J = p, Q = h, P = e, Y = r.
2. So ZJQPYP decodes to 'sphere'.

Teacher's Note:
1. Decoding with a key table needs no pattern; just read each letter carefully.
2. Eliminate options as soon as one letter does not match.

Answer: (c) RUPGAN

Explanation:
1. BACKING to GNIKCAB: The letters are written in reverse order.
2. NAGPUR coded the same way gives RUPGAN.

Teacher's Note:
1. Find the rule from the first two letters, then confirm it on the rest.
2. Common rules: reverse order, or a fixed forward/backward shift.

Answer: (a) OBHQVS

Explanation:
1. TOURS to UPVST: Each letter is replaced by the next letter (+1).
2. NAGPUR coded the same way gives OBHQVS.

Teacher's Note:
1. Find the rule from the first two letters, then confirm it on the rest.
2. Common rules: reverse order, or a fixed forward/backward shift.

Answer: (d) QDJSXU

Explanation:
1. SUPER to VXSHU: Each letter moves three places forward (+3).
2. NAGPUR coded the same way gives QDJSXU.

Teacher's Note:
1. Find the rule from the first two letters, then confirm it on the rest.
2. Common rules: reverse order, or a fixed forward/backward shift.

Answer: (e) REKTYV

Explanation:
1. SOUPS to WSYTW: Each letter moves four places forward (+4).
2. NAGPUR coded the same way gives REKTYV.

Teacher's Note:
1. Find the rule from the first two letters, then confirm it on the rest.
2. Common rules: reverse order, or a fixed forward/backward shift.

Answer: (b) PCIRWT

Explanation:
1. TERMS to VGTOU: Each letter moves two places forward (+2).
2. NAGPUR coded the same way gives PCIRWT.

Teacher's Note:
1. Find the rule from the first two letters, then confirm it on the rest.
2. Common rules: reverse order, or a fixed forward/backward shift.

Answer: (c) DYOJXLA

Explanation:
1. B - 3 = Y, O - 2 = M, U - 3 = R, Q - 2 = O, U - 3 = R, E - 2 = C, T - 3 = Q: letters move back 3, 2, 3, 2 ... places.
2. GARLAND: G-3 = D, A-2 = Y, R-3 = O, L-2 = J, A-3 = X, N-2 = L, D-3 = A, giving DYOJXLA.

Teacher's Note:
1. Write the alphabet with position numbers (A=1 ... Z=26) once on rough paper; it makes every shift instant.
2. Check the shift on two or three letters of the given pair before applying it, and remember Z wraps round to A.

Answer: (a) PEN

Explanation:
1. Each letter is shown as a number followed by a letter: move the letter forward by the number.
2. 6C = C + 6 = I, 7G = G + 7 = N, 10A = A + 10 = K, giving INK.
3. 8H = H + 8 = P, 1D = D + 1 = E, 7G = N, giving PEN.

Teacher's Note:
1. When the code is given and the word is asked, apply the rule backwards (subtract where you added).
2. Check that your decoded answer is a real word; that confirms the rule.

Answer: (d) AOTGNILRN

Explanation:
1. In MPPISSISSII the first and last letters stay in place and the letters between them are written in reverse order.
2. ARLINGTON: keep A and N, reverse RLINGTO to OTGNILR, giving AOTGNILRN.

Teacher's Note:
1. When the code uses the same letters as the word, number the letters 1, 2, 3 ... and write the order they appear in.
2. Apply that position order, not the letters themselves, to the new word.

Answer: (a) 36843654

Explanation:
1. Letter by letter: C = 3, R = 8, O = 6, D = 4, I = 2, L = 5, E = 7.
2. CORDCOLD = 3 6 8 4 3 6 5 4.

Teacher's Note:
1. Make a small letter-to-code table from the given words; most questions need no rule at all.
2. Look at the options and check only the positions where they differ, to save time.

Answer: (c) KNOWLEDGE

Explanation:
1. MARKETING to NBSKETHMF: first three letters move 1 forward, middle three stay, last three move 1 back.
2. Reverse this on LOPWLECFD: LOP - 1 = KNO, WLE unchanged, CFD + 1 = DGE.
3. The word is KNOWLEDGE.

Teacher's Note:
1. When the code is given and the word is asked, apply the rule backwards (subtract where you added).
2. Check that your decoded answer is a real word; that confirms the rule.

Answer: (d) BLONDE

Explanation:
1. LATEST to MZVCVQ: letters move +1, -1, +2, -2, +3, -3 places.
2. Undo on CKQLGB: C-1 = B, K+1 = L, Q-2 = O, L+2 = N, G-3 = D, B+3 = E.
3. The word is BLONDE.

Teacher's Note:
1. When the code is given and the word is asked, apply the rule backwards (subtract where you added).
2. Check that your decoded answer is a real word; that confirms the rule.

Answer: (b) FXSFMOPRD

Explanation:
1. EQUIPMENT to FQTJPLFNS: letters move +1, 0, -1 repeatedly (E to F, Q stays, U to T ...).
2. EXTEMPORE: E+1 = F, X, T-1 = S, E+1 = F, M, P-1 = O, O+1 = P, R, E-1 = D, giving FXSFMOPRD.

Teacher's Note:
1. Write the alphabet with position numbers (A=1 ... Z=26) once on rough paper; it makes every shift instant.
2. Check the shift on two or three letters of the given pair before applying it, and remember Z wraps round to A.

Answer: (d) IDJULACI

Explanation:
1. Split MUNICIPALITY into pairs: MU NI | CI PA | LI TY. In each set of two pairs, the second pair is reversed and written first: IN MU, AP CI, YT LI.
2. JUDICIAL: JU DI | CI AL becomes ID JU, LA CI, giving IDJULACI.

Teacher's Note:
1. When the code uses the same letters as the word, number the letters 1, 2, 3 ... and write the order they appear in.
2. Apply that position order, not the letters themselves, to the new word.

Answer: (b) DIRAGENT

Explanation:
1. Number TEACHING as T1 E2 A3 C4 H5 I6 N7 G8; CHEATING is the order 4 5 2 3 1 6 7 8.
2. GRADIENT = G1 R2 A3 D4 I5 E6 N7 T8; order 4 5 2 3 1 6 7 8 gives DIRAGENT.

Teacher's Note:
1. When the code uses the same letters as the word, number the letters 1, 2, 3 ... and write the order they appear in.
2. Apply that position order, not the letters themselves, to the new word.

Answer: (d) TGUM

Explanation:
1. CRIME to GMOFM: C+4 = G, R-5 = M, I+6 = O, M-7 = F, E+8 = M.
2. PLOT: P+4 = T, L-5 = G, O+6 = U, T-7 = M, giving TGUM.

Teacher's Note:
1. Write the alphabet with position numbers (A=1 ... Z=26) once on rough paper; it makes every shift instant.
2. Check the shift on two or three letters of the given pair before applying it, and remember Z wraps round to A.

Answer: (b) 3423517

Explanation:
1. K = 5, I = 2, T = 6, C = 3, H = 4, E = 1, N = 7.
2. CHICKEN = C H I C K E N = 3 4 2 3 5 1 7.

Teacher's Note:
1. Make a small letter-to-code table from the given words; most questions need no rule at all.
2. Look at the options and check only the positions where they differ, to save time.

Answer: (d) CLPPT

Explanation:
1. Odd places move one letter forward: L to M, B to C, A to B, Y to Z.
2. Even places become the opposite letter (positions add to 27): I to R, R to I.
3. BOOKS: B to C, O to L, O to P, K to P, S to T, giving CLPPT.

Teacher's Note:
1. Opposite letters pair as A-Z, B-Y, C-X ...; their positions always add up to 27.
2. When a single shift does not fit, check odd and even places separately.