Practice 30 verified SSC CGL Coding Decoding MCQs with answers and detailed explanations. Improve your reasoning accuracy and crack Coding-Decoding questions faster.
SSC CGL Coding Decoding MCQs
1. If each letter of a word is replaced by the letter 2 positions ahead in the English alphabet, how will CAT be coded?
A) ECV B) DBU
C) FCW D) EBU
Answer: A) ECV
Explanation:
C → E, A → C, T → V
CAT → ECV
2. If each letter is replaced by the letter 1 position before it, how will DOG be coded?
A) BME B) CNG
C) CNF D) DNF
Answer: C) CNF
Explanation:
D → C; O → N; G → F
DOG → CNF
3. If A is coded as Z, B as Y, C as X, and so on, how will CODE be coded?
A) XMWV B) XLWV
C) XLEV D) WLXV
Answer: B) XLWV
Explanation:
Using opposite alphabet positions
C → X; O → L; D → W; E → V
Hence, CODE → XLWV
4. If every letter is replaced by the next letter in the alphabet, how will MANGO be coded?
A) MBOHP B) NBNHP
C) NBOGP D) NBOHP
Answer: D) NBOHP
Explanation:
M → N; A → B; N → O; G → H; O → P
MANGO → NBOHP
SSC CGL Coding Decoding MCQs
5. If the code of a word is obtained by adding the alphabetical positions of all its letters, what is the code for PEN?
A) 35 B) 34
C) 36 D) 37
Answer: A) 35
Explanation:
P = 16; E = 5; N = 14;
16 + 5 + 14 = 35
∴ The code is 35
6. If each word is coded by the sum of the alphabetical positions of its letters, what is the code for FACEE?
A) 14 B) 16
C) 15 D) 17
Answer: C) 15
Explanation:
F = 6; A = 1; C = 3; E = 5
6 + 1 + 3 + 5 = 15
7. If every letter is replaced by the letter 2 positions ahead, what is the code for DELHI?
A) EFMHI B) FGNJK
.C) FGMJK D) EGNIK
Answer: B) FGNJK
Explanation:
D → F; E → G; L → N; H → J; I → K
Thus: DELHI → FGNJK
8. If the letters of a word are simply written in reverse order, how will TRAIN be coded?
A) NIATR B) NIRAT
C) TNIAR D) NIART
Answer: D) NIART
Explanation:
TRAIN written backwards is: NIART
SSC CGL Coding Decoding MCQs
9. If the code is the sum of the alphabetical positions of all letters, find the code for BLUE.
A) 40 B) 39
C) 41 D) 42
Answer: A) 40
Explanation:
B = 2; L = 12; U = 21; E = 5
2 + 12 + 21 + 5 = 40
10. Using the rule A = 26, B = 25, C = 24, …, Z = 1, find the code for CAT by adding the values.
A) 56 B) 58
C) 57 D) 55
Answer: C) 57
Explanation:
C = 24; A = 26; T = 7
24 + 26 + 7 = 57
11. If every letter is replaced by the letter 2 positions ahead, what is the code for BOOK?
A) DPPM B) DQQM
C) CQQN D) DQQL
Answer: B) DQQM
Explanation:
B → D; O → Q; O → Q; K → M
BOOK → DQQM
12. If each letter is replaced by the previous letter in the alphabet, how will TABLE be coded?
A) SZAKD B) SZB KD
C) TZAKE D) RYZJC
Answer: A) SZAKD
Explanation:
T → S; A → Z; B → A; L → K; E → D
Hence: TABLE → SZAKD
13. In a certain code, every vowel is replaced by the next letter, while every consonant is replaced by the letter 2 positions ahead. How is CODE coded?
A) DQFE B) EPGE
C) EPFF D) DQFF
Answer: C) EPFF
Explanation:
C is a consonant: C → E
O is a vowel: O → P
D is a consonant: D → F
E is a vowel: E → F
CODE → EPFF
14. In a code, vowels remain unchanged, while every consonant is replaced by the next letter. INDIA coded?
A) IOEJA B) IOEIA
C) JOEIA D) INEIA
Answer: B) IOEIA
Explanation:
I → I; N → O; D → E; I → I; A → A
Thus: INDIA → IOEIA
SSC CGL Coding Decoding MCQs
15. If letters are coded by interchanging each pair of adjacent letters, how will ABCDEF be coded?
A) BADCFE B) ABDCEF
C) BADCEF D) BADCFE
Answer: D) BADCFE
Explanation:
Pairs are: AB → BA; CD → DC; EF → FE
ABCDEF → BADCFE
16. First, reverse the word, and then replace every letter with the next letter. How will CAT be coded?
A) UBD B) TBC
C) DUB D) VCE
Answer: A) UBD
Explanation:
Step 1: Reverse CAT:
CAT → TAC
Step 2: Shift each letter forward by 1:
T → U; A → B; C → D; CAT → UBD
17. In a code, letters in odd positions are shifted 1 position forward, while letters in even positions are shifted 1 position backward. How will ABCD be coded?
A) BZDC B) BACD
C) BADC D) CBAD
Answer: C) BADC
Explanation:
1st letter: A → B
2nd letter: B → A
3rd letter: C → D
4th letter: D → C
ABCD → BADC
SSC CGL Coding Decoding MCQs
18. If every letter is replaced by its next alphabet letter, with Z followed by A, how will XYZ be coded?
A) XZA B) YZA
C) YZB D) ZAB
Answer: B) YZA
Explanation:
X → Y; Y → Z; Z → A
XYZ → YZA
19. If the code of a word is the sum of the alphabetical positions of its letters, what is the code for STAR?
A) 56 B) 57
C) 59 D) 58
Answer: D) 58
Explanation:
S = 19; T = 20; A = 1; R = 18
19 + 20 + 1 + 18 = 58
20. If a word is coded simply by the number of letters it contains, what is the code for ELEPHANT?
A) 8 B) 7
C) 9 D) 10
Answer: A) 8
Explanation:
ELEPHANT contains E-L-E-P-H-A-N-T = 8 letters
its code is 8
SSC CGL Coding Decoding MCQs
21. If APPLE = 50 because the code is obtained by adding alphabetical positions, what is the code for ORANGE?
A) 58 B) 59
C) 60 D) 61
Answer: C) 60
Explanation:
O = 15; R = 18; A = 1; N = 14; G = 7; E = 5
15 + 18 + 1 + 14 + 7 + 5 = 60
22. If the code of a word is obtained by multiplying the alphabetical positions of its first and last letters, what is the code for DOG?
A) 24 B) 32
C) 21 D) 28
Answer: D) 28
Explanation:
First letter D = 4
Last letter G = 7
Code = 4 × 7 = 28
23. In a code, the value of each letter is twice its alphabetical position. What is the code for BAD?
A) 14 B) 12
C) 16 D) 18
Answer: A) 14
Explanation:
B = 2 × 2 = 4
A = 2 × 1 = 2
D = 2 × 4 = 8
Total = 4 + 2 + 8 = 14
24. .Using A = 26, B = 25, …, Z = 1, find the code for DOG.
A) 54 B) 56
C) 55 D) 57
Answer: C) 55
Explanation:
D = 23; O = 12; G = 20
23 + 12 + 20 = 55
25. In a code, the 1st letter is shifted by 1, the 2nd by 2, the 3rd by 3, and the 4th by 4 positions forward. How will CODE be coded?
A) DPGI B) DQGI
C) DQFH D) ERHJ
Answer: B) DQGI
Explanation:
C + 1 = D; O + 2 = Q; D + 3 = G; E + 4 = I
CODE → DQGI
SSC CGL Coding Decoding MCQs
26. In a code, the 1st letter is shifted 3 positions forward, the 2nd by 2 positions, and the 3rd by 1 position. How will DOG be coded?
A) GPH B) FQH
C) GPG D) GQH
Answer: D) GQH
Explanation:
D + 3 = G; O + 2 = Q; G + 1 = H
DOG → GQH
27. For successive letters, the shifts are +1, −2, +3, −4. How will MATH be coded?
A) NYWD B) NZWC
C) MXWD D) OYXE
Answer: A) NYWD
Explanation:
M + 1 = N; A − 2 = Y; T + 3 = W; H − 4 = D
MATH → NYWD
28. If the first and last letters are interchanged, while all middle letters remain unchanged, how will ABCDE be coded?
A) EBCDA B) ACBDE
C) EDCBA D) BACDE
Correct Answer: A) EBCDA
Explanation:
Only A and E exchange their positions:
ABCDE → EBCDA
29. First, replace every letter by the previous letter, and then reverse the resulting word. How will DOG be coded?
A) CNF B) FNC
C) NCF D) FCN
Answer: B) FNC
Explanation:
Step 1 — Shift each letter backward:
D → C; O → N; G → F; DOG → CNF
Step 2 — Reverse:
CNF → FNC
the answer is FNC
30. If the code of a word is obtained by adding the alphabetical positions of its first and last letters only, what is the code for BOOK?
A) 12 B) 14
C) 15 D) 13
Answer: D) 13
Explanation:
First letter B = 2
Last letter K = 11
2 + 11 = 13
the code is 13
SSC CGL Coding Decoding MCQs
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