Coding-Decoding Notes with MCQ (English + Hindi)

Coding–Decoding Notes with MCQs (English + Hindi)

1. Letter Coding (अक्षर कूट)

English: In this type, letters are shifted forward or backward in the alphabet.
Hindi: इस प्रकार में अक्षरों को वर्णमाला में आगे या पीछे शिफ्ट किया जाता है।

Example: CAT → DBU (+1 shift)
C(+1)=D, A(+1)=B, T(+1)=U

MCQ Practice Questions

Q1. If APPLE is coded as BQQMF, then MANGO is coded as?
यदि APPLE को BQQMF लिखा जाता है, तो MANGO को कैसे लिखा जाएगा?
A) NBOHP
B) LZMNF
C) NBPHP
D) OCPHQ
Correct Answer: A) NBOHP
Explanation (English): Each letter is shifted by +1.
M(+1)=N, A(+1)=B, N(+1)=O, G(+1)=H, O(+1)=P.

व्याख्या (Hindi): प्रत्येक अक्षर को +1 से आगे बढ़ाया गया है।
Q2. If SKY is written as 192511, then SEA is written as?
यदि SKY को 192511 लिखा जाता है, तो SEA को कैसे लिखा जाएगा?
A) 1951
B) 1915
C) 19511
D) 5119
Correct Answer: A) 1951
Explanation (English): Alphabet positions are used.
S=19, E=5, A=1 → 1951.

व्याख्या (Hindi): अक्षरों के स्थान संख्या का प्रयोग किया गया है।
Q3. If DOG = 26 and CAT = 24, then BAT = ?
यदि DOG = 26 और CAT = 24, तो BAT = ?
A) 21
B) 22
C) 23
D) 24
Correct Answer: C) 23
Explanation (English): Using alphabet positions:
B=2, A=1, T=20 → 2+1+20=23.

व्याख्या (Hindi): अक्षरों की क्रम संख्या जोड़ें।
Q4. In a certain code, PEN = 123 and MAP = 456. What is NAP?
एक कूट में PEN = 123 और MAP = 456 है। NAP = ?
A) 356
B) 345
C) 365
D) 436
Correct Answer: A) 356
Explanation (English): From PEN = 123 → P=1, E=2, N=3
From MAP = 456 → M=4, A=5, P=6
So N=3, A=5, P=6 → 356.

व्याख्या (Hindi): अक्षर के अनुसार संख्या निर्धारित करें।

Fast Solving Strategy (तेज़ हल करने की रणनीति)

  • Check +1 / -1 shift pattern (शिफ्ट पैटर्न देखें)
  • Check reverse alphabet (उल्टी वर्णमाला देखें)
  • Convert letters into numbers (अक्षर को संख्या में बदलें)
  • Look for repetition (दोहराव देखें)
  • Check sum or multiplication (जोड़ या गुणा जांचें)
Q6. If TABLE = GZYOV, then CHAIR = ?
यदि TABLE = GZYOV है, तो CHAIR = ?
A) XSZRI
B) XSZIR
C) XRZSI
D) YSZRI
Answer: A) XSZRI
English: Reverse alphabet rule (A↔Z, B↔Y...).
Hindi: उल्टी वर्णमाला का प्रयोग।
Q7. If BRAIN = CSBJO, then HEART = ?
A) IFBSU
B) IFZSU
C) HEBRT
D) IFASU
Answer: A) IFBSU
Each letter +1 shift.
Q8. If 123 = BCD, then 345 = ?
A) DEF
B) EFG
C) CDE
D) FGH
Answer: A) DEF
1=A so 3=C; pattern continues.
Q9. If KING = 41, then QUEEN = ?
A) 60
B) 61
C) 62
D) 63
Answer: C) 62
K(11)+I(9)+N(14)+G(7)=41
Q(17)+U(21)+E(5)+E(5)+N(14)=62
Q10. If LIGHT = MJHIU, then SOUND = ?
A) UQWPF
B) UQXPF
C) TQVPE
D) URXQF
Answer: B) UQXPF
+2,+1,+2,+1,+2 alternating shift.
Q11. If PEN = 123 and MAP = 456, then PAN = ?
A) 153
B) 145
C) 156
D) 165
Answer: A) 153
Q12. If CAR = 24 (sum), BUS = 46 (double sum), then BIKE = ?
A) 54
B) 52
C) 56
D) 58
Answer: A) 54
B(2)+I(9)+K(11)+E(5)=27 ×2 = 54
Q13. If DELHI = CCJGG, then MUMBAI = ?
A) LTLAAH
B) LTLZZH
C) LTMBAH
D) KTLAAH
Answer: A) LTLAAH
Each letter −1 shift.
Q14. If ABC = 6 and DEF = 15, then GHI = ?
A) 21
B) 24
C) 27
D) 30
Answer: B) 24
Q15. If MOON = 57, then STAR = ?
A) 58
B) 60
C) 62
D) 64
Answer: A) 58
M(13)+O(15)+O(15)+N(14)=57
S(19)+T(20)+A(1)+R(18)=58
Q16. If 5 → E, then 20 → ?
A) S
B) T
C) U
D) V
Answer: B) T
Q17. If GOOD = HPPF, then BAD = ?
A) CBE
B) CCF
C) BBE
D) CDD
Answer: A) CBE
Q18. If CAT = XZG (reverse), then DOG = ?
A) WLT
B) VKT
C) WKT
D) VLT
Answer: A) WLT
Q19. If 246 = BDF, then 135 = ?
A) ACE
B) BDF
C) CEG
D) ADF
Answer: A) ACE
Q20. If PEN = 35 (sum), then BOOK = ?
A) 43
B) 44
C) 45
D) 46
Answer: A) 43
B(2)+O(15)+O(15)+K(11)=43
Q21. If RAIN = 2614914, then SUN = ?
A) 192114
B) 191421
C) 211914
D) 192114
Answer: A) 192114
Q22. If A=1, B=4, C=9, then D=?
A) 12
B) 14
C) 16
D) 18
Answer: C) 16
Square numbers pattern.
Q23. If JUMP = KVNS, then WALK = ?
A) XBMK
B) XBNL
C) XBMJ
D) YBNL
Answer: B) XBNL
Q24. If ZEBRA = 2652181, then FOX = ?
A) 61524
B) 61523
C) 62415
D) 61425
Answer: A) 61524
Q25. If 3 → C, 6 → F, then 15 → ?
A) O
B) P
C) Q
D) R
Answer: A) O
Q26. If STAR = TUBS, then MOON = ?
A) NPPQ
B) NPOO
C) NPPM
D) NPPN
Answer: A) NPPQ
Q27. If 12 = L, 20 = T, then 8 = ?
A) G
B) H
C) I
D) J
Answer: B) H
Q28. If PEAR = 1615118, then APPLE = ?
A) 11616125
B) 11616125
C) 11616112
D) 11616126
Answer: A) 11616125
Q29. If CLOUD = DMPVE, then RAIN = ?
A) SBJO
B) SBKP
C) TBJO
D) SBIN
Answer: A) SBJO
Q30. If 7 → G and 14 → N, then 21 → ?
A) U
B) V
C) W
D) X
Answer: A) U