Q1): If CAT is coded as DBU, then how will DOG be coded?
A) EPH
B) ENH
C) DPH
D) FQH
Answer: A) EPH
Explanation: In CAT → DBU, each letter is shifted one step forward in the alphabet (C→D, A→B, T→U). So DOG becomes D→E, O→P, G→H, which gives EPH.
Q2): Using A=1, B=2, C=3, … Z=26, what is the code for CAB?
A) 3-1-2
B) 2-1-3
C) 1-3-2
D) 3-2-1
Answer: A) 3-1-2
Explanation: C=3, A=1, B=2. Writing them in the same order as CAB gives 3-1-2.
Q3): If MANGO is coded as OCPIQ, then APPLE will be coded as (same rule)?
A) BQQMF
B) CRRNG
C) CQQNG
D) DRRNH
Answer: B) CRRNG
Explanation: In MANGO → OCPIQ, each letter is shifted +2 (M→O, A→C, N→P, G→I, O→Q).
Apply +2 to APPLE: A→C, P→R, P→R, L→N, E→G. So the code is CRRNG.
Q4): If FISH is coded as EHRG, then BIRD will be coded as (same rule)?
A) AHQC
B) AJQC
C) ZHQB
D) AHQB
Answer: A) AHQC
Explanation: FISH → EHRG means each letter is shifted one step backward (F→E, I→H, S→R, H→G).
So BIRD becomes B→A, I→H, R→Q, D→C, which gives AHQC.
Q5): In reverse alphabet coding (A=Z, B=Y, C=X, …), if DOG is coded as WLT, then CAT is coded as:
A) XZG
B) XZF
C) WZG
D) YZG
Answer: A) XZG
Explanation: Reverse coding means each letter is replaced by its opposite letter from the end.
C→X, A→Z, T→G. So CAT → XZG.
Q6): If HELLO is coded as IFMMP, then WORLD will be coded as:
A) XPSME
B) XQRME
C) WPSME
D) XPRNE
Answer: A) XPSME
Explanation: HELLO → IFMMP shows each letter is shifted +1 (H→I, E→F, L→M, L→M, O→P).
WORLD becomes W→X, O→P, R→S, L→M, D→E, giving XPSME.
Q7): Rule: Replace each vowel with the next vowel (A→E→I→O→U→A). Keep consonants unchanged. What is the code for TUBE?
A) TABI
B) TOBI
C) TUBI
D) TABE
Answer: A) TABI
Explanation: Apply the rule letter by letter:
T (consonant) stays T, U→A (next vowel after U is A), B stays B, E→I.
So TUBE → TABI.
Q8): If PEN is coded as 16-5-14 (A=1 to Z=26), then BOOK is coded as:
A) 2-14-14-11
B) 2-15-15-11
C) 3-15-15-12
D) 2-16-16-11
Answer: B) 2-15-15-11
Explanation: BOOK → B=2, O=15, O=15, K=11. So the code is 2-15-15-11.
Q9): If GIRL is coded as LIRG (first and last letters are swapped), then BOY is coded as:
A) OYB
B) YOB
C) BYO
D) YBO
Answer: B) YOB
Explanation: Swap the first and last letters only. BOY becomes Y O B, so the code is YOB.
Q10): If MATH is coded as HTAM (letters are written in reverse order), then CODE is coded as:
A) EDOC
B) OCDE
C) DOCE
D) ECDO
Answer: A) EDOC
Explanation: Reverse order means last letter comes first. CODE becomes E D O C, which is EDOC.
Q11): If SUNDAY is coded as TVOEBZ, then MONDAY will be coded as:
A) NPOEBZ
B) NQPEBZ
C) MPOEBZ
D) NPODAZ
Answer: A) NPOEBZ
Explanation: SUNDAY → TVOEBZ shows each letter is shifted +1 (S→T, U→V, N→O, D→E, A→B, Y→Z).
So MONDAY becomes M→N, O→P, N→O, D→E, A→B, Y→Z, giving NPOEBZ.
Q12): If TIGER is coded as UJHFS, then what word is coded as XPSME?
A) WORLD
B) WORMD
C) WORDL
D) VORLD
Answer: A) WORLD
Explanation: TIGER → UJHFS means each letter is shifted +1.
So to decode XPSME, shift each letter -1: X→W, P→O, S→R, M→L, E→D. That forms WORLD.
Q13): If COLD is coded as DPME, then HEAT is coded as:
A) IGBU
B) IFBU
C) JFCV
D) HFAT
Answer: B) IFBU
Explanation: COLD → DPME shows a +1 shift for each letter.
HEAT becomes H→I, E→F, A→B, T→U, so the code is IFBU.
Q14): If KID is coded as LJE, then SON is coded as:
A) TPO
B) TPM
C) UPO
D) SPN
Answer: A) TPO
Explanation: KID → LJE indicates each letter is shifted +1.
SON becomes S→T, O→P, N→O, so the code is TPO.
Q15): If BOOK is coded as CPPL and PEN is coded as QFO (same rule), then NOTE is coded as:
A) OPVF
B) OPUF
C) NPUF
D) OQUG
Answer: B) OPUF
Explanation: BOOK → CPPL shows each letter is shifted +1 (B→C, O→P, O→P, K→L).
So NOTE becomes N→O, O→P, T→U, E→F, giving OPUF.
Q16): If MOUSE is coded as KMSQC, then POWER is coded as:
A) NMUCP
B) OMVCP
C) NMVCP
D) NMUCO
Answer: A) NMUCP
Explanation: MOUSE → KMSQC means each letter is shifted -2 (M→K, O→M, U→S, S→Q, E→C).
Apply -2 to POWER: P→N, O→M, W→U, E→C, R→P. So the code is NMUCP.
Q17): If TRAIN is coded as NTRAI (last letter moved to the front), then CLOUD is coded as:
A) DCLOU
B) DCOUL
C) UDLOC
D) CLODU
Answer: A) DCLOU
Explanation: The rule is “move the last letter to the beginning.”
CLOUD → last letter is D, so it becomes D + CLOU = DCLOU.
Q18): If 123 is coded as 234 (each digit increased by 1), then 568 is coded as:
A) 679
B) 678
C) 589
D) 667
Answer: A) 679
Explanation: Each digit is increased by 1.
5→6, 6→7, 8→9. So 568 becomes 679.
Q19): If 7 is coded as 14, 9 is coded as 18 (number is doubled), then 12 is coded as:
A) 22
B) 24
C) 26
D) 30
Answer: B) 24
Explanation: The rule is “multiply the number by 2.”
So 12 × 2 = 24.
Q20): Using A=1, B=2, … Z=26, if LION is coded as 12-9-15-14, then KING is coded as:
A) 11-9-14-7
B) 11-10-14-7
C) 12-9-14-7
D) 11-9-15-7
Answer: A) 11-9-14-7
Explanation: K=11, I=9, N=14, G=7. Writing them in order gives 11-9-14-7.