வெல்லுங்கள் CSAT 2025 - 20: Coding & Decoding

Questions & Answers - (Multiple Choice) - CODING AND DECODING

கொள்குறி வினா- விடைகள் குறியீடுகளும் மறுகுறியீடுகளும்

1. If PLAY is coded as NJYW then how would you code GROUND?
a. FQNTMC b. ITQWPF
c. EPMTLB d. EPMSLB

2. 1. If STUDENT is coded as TVXHJTA then how would you code TEACHER?
a. UFBDIFS b. UGDGMKX
c. UGDGMKY d. UFDGMKX

3. If MUMBAI is coded as UMBMIA , then how KOLKATTA will be coded?
a. OKKLTATA b. OKKLTAAT
c. OKKTLATA d. OKLKTATA

4. If in a certain code, URGENT is coded as 2118751420, then how SUDDEN will be coded?
a. 192144514 b. 192245413
c. 202244514 d. 202245413

5. If in a certain code, YELLOW is coded as 753365, then how BLACK will be coded?
a. 2121311 b. 231311
c. 23132 d. 21332

6. If 2357 is coded as @#$% and 4689 coded as ?&*/, then how 345679 will be coded?
a. $%@?&*# b. #?$&/%
c. #?$/&% d. #?$&%/

7. According to a military code, CAPTAIN is coded as PACTNIA and SOLDIER is LOSDREI. What is the code for BORDERS?
a. R O D B S R E b. R O B D S R E
c. O B D R R E S d. O B D R E S R

8- 10 Answer the following questions based on the information given below :

If 'si ni mi ' means ' you are clever ',
' ni di ei ' means ' Rita is clever ' and
' ei fi ni ' means ' clever is quality ', then

8. Which code means 'you' ?
a. mi b. si
c. si or mi d. ni

9. Which code means 'quality' ?
a. fi b. ei
c. ei or ni d. ni

10. Which code means 'Rita' ?
a. ei b. di
c. ei or ni d. ni

11 - 12
Study the following statements A, B and C and answer the questions below:
A. 1, 5, 9 means ' you better go '
B. 5, 6, 7 means ' you come here '
C. 3, 7, 9 means ' come and go '

11. Which numeral means ' and ' ?
a. 9 b. 7
c. 5 d. 3

12. Which numeral means ' go ' ?
a. 9 b. 7
c. 5 d. 3

13. If FATHER is coded as LFXKGS, then how UNCLE will be coded?
a. YQFNF b. YQENF
c. ZRFNF d. ZQFNF

14. In a certain code language, OWNER is coded as TGPYQ , then how PROPERTY will be coded?
a. RTQRGTVA b. AVTGRQTR
c. RTQRGTVZ d. ZVTGRQTR

15. If INDIA is coded as KRJQK, Then how KERALA will be coded?
a. M I X I V M b. M K Y I V M
c. M I Y J V M d. M I X J W M

Answers

1. d 2. c 3. b 4.a 5. c

6. d 7. b 8. c 9. a 10. b

11. d 12. a 13. c 14. b 15. a

Explanation to Answers

1. P L A Y N J Y W
16 12 1 25 14 10 25 23
Comparing the codes,
Except A and Z, all other code numbers are two less than original.
If we take 1+26 = 27, 27 and 25 , then all letters are coded uniformly. Hence
G R O U N D -> E P M S L B
7 18 15 21 14 4 5 16 13 19 12 2

2. Diff
S 19 T 20 1 T U
T 20 V 22 2 E G
U 21 X 24 3 A D
D 4 H 8 4 C G
E 5 J 10 5 H M
N 14 T 20 6 E K
T 20 A 27 7 R Y
(26+1)

3. Every two letters reversed.
So KOLKATTA will be coded
as OKKLTAAT

4. If take the actual position of letters as it is A = 1, B = 2 , C = 3 .......etc., Recall
E = 5, J = 10, O = 15, T = 20 and Y = 25.
Original position of letters in the word
U R G E N T is 21 18 7 5 14 20.
So S U D D E N will be coded as
19 21 4 4 5 14

5. YELLOW - 25 5 12 12 15 23
Code - 7 5 3 3 6 5
Just digital total.
So BLACK - 2 12 1 3 11
Code 2 3 1 3 2

6. Codes given
2 3 5 7 @ # $ %
4 6 8 9 ? & * /
Corresponding code for
3 4 5 6 7 9
# ? $ & % /

7. C A P T A I N P A C T N I A
1 2 3 4 5 6 7 3 2 1 4 7 6 5

S O L D I E R L O S D R E I
1 2 3 4 5 6 7 3 2 1 4 7 6 5

So
1 2 3 4 5 6 7 3 2 1 4 7 6 5
B O R D E R S R O B D S R E

8 - 10
8. c 9. a 10. b
'si ni mi ' means ' you are clever ',
' ni di ei ' means ' Rita is clever ' and
' ei fi ni ' means ' clever is quality '
=> clever is common to all sentences. Likewise ' ni ' is common among codes.
So ' ni ' is code for 'clever'

' ni di ei ' means ' Rita is clever ' and
' ei fi ni ' means ' clever is quality '
=> ' is clever ' is common to two sentences whereas ' ei ni ' is common among codes.
=> ' ei ' is code for 'is'
Hence code for Rita is ' di ' and
code for Quality is ' fi '
Left words are ' you ' and ' are '
Codes for ' you ' and ' are ' are
'si' and 'mi'.
Hence the code for ' you ' is 'si' or 'mi'.
And code for ' are ' is 'mi' or 'si'.

11 - 12

you better go
1 5 9
you come here
5 6 7

From these two statements code for you - 5

you better go
1 5 9
come and go
3 7 9

From these two statements code for go - 9

It is clear that code for better - 1

you come here
5 6 7
come and go
3 7 9

From these two statements code for come - 7

It is clear that code for and - 3

13. F A T H E R - L F X K G S
6 1 20 8 5 18 - 12 6 24 11 7 19
6+ 6 = 12; 1+5 =6 ; 20+4=24 ; 8+ 3=11; 5+2=7; 18+1 = 19 since FATHER is a six letter word. Addition is started from 6.
Similarly UNCLE is a FIVE letter word. Addition is started from 5.
U N C L E - 21 14 3 12 5
21+5 = 26; 14+4 = 18; 3+3 = 6;
12+2 = 14 ; 5+1 = 6
26 18 6 14 6
Z R F N F

14. O W N E R - T G P Y Q
15 23 14 5 18 - 20 7 16 25 17
Reversing
18 5 14 23 15
Adding 2
20 7 16 25 17
Similarly
P R O P E R T Y -
16 18 15 16 5 18 20 25 adding 2
18 20 17 18 7 20 22 27 Reversing
1 22 20 7 18 17 20 18
A V T G R Q T R
since 27 -26 = 1 -> A

15. I N D I A K R J Q K
9 14 4 9 1 11 18 10 17 11
9+2 =11; 14+4 = 18 ; 4+6 = 10;
9+8 = 17; 1+10 = 11

K E R A L A 11 5 18 1 12 1
+2, +4, +6, +8, +10 and +12
respectively, we get
13 9 24 9 22 13
Corresponding code
M I X I V M

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