10th Class Mental Ability Coding-Decoding Coding-Decoding

Coding-Decoding

Category : 10th Class

WHAT IS CODING?

Coding is a method of expressing something in a secret way.

 

WHAT IS DECODING

Decoding is a process to understand a code language.

 

TYPES OF CODING

1.    Letter Coding: Letters are used in forward or backward or both the directions for making some code language.

2.    Direct Letter Coding: Letters of a word are directly replaced by other letters.

3.    Number/Symbol Coding: Numerals or symbols are assigned to words.

4.    Substitution Coding: Some particular words are assigned to certain names.

 

 

EXAMPLE

 

 

1.         If in a code language, 'COULD' is written as 'BNTKC and 'MARGIN' is written as 'LZQFHM', then how will 'MOULDING' be written in that code?

             (a) CHEMFINTK             (b) LNKTCHMF    

             (c) LNTKCHMF              (d) NITKHCMF

 

Explanation: (c)

So, 'MOULDING' will be written as 'LNTKCHMF'.

 

2.         In a code, CONTRIBUTE is written as ETUBIRTNOC. If POPULARISE is written in that code, then which letter will be in the 6th place when counted from the left end?

(a) P                             (b) L             

(c) R                              (d) I

 

Explanation: (b)

In code language, the letters of the word are written in the reverse order.

So, POPULARISE will be written as \[E\text{ }S\text{ }I\text{ }R\text{ }AOU\,P\,O\,P.\]

Clearly, 6th letter is 'L

 

3.         In a certain code, PRAISE is written as #@$27% and RESPIRE is written as @%7#2@%.

How is REPAIR written in that code?

(a) #2@%$@                (b) %@7#$2@    

(c) @%#$2@                (d) @%$2#@

 

Explanation: (c)

From the given words and their codes, we conclude that

Letter

Code

P

#

R

@

A

$

I

2

S

7

E

%

 

So, REPAIR will be written as '@ % # $ 2 @'.

 

4.         If HOTEL = 55, then BORE =?.

(a) 40                            (b) 35             

(c) 55                            (d) 60

Explanation: (b)

Code = (Sum of place values of letters) - 5

 BORE = (B + O + R + E) - 5 = (2 + 15 + 18 + 5) - 5 = 35.

 

5.         In a certain code, 13479 is written as AQFJL and 5268 is written as DMPN. How is 396824 written in that code?

(a) QLPNKJ                   (b) QLPNMF      

(c) QLPMNF                  (d) QLPNDF

 

Explanation: (b)

From the given information, we have:

Digit

Code

1

A

3

Q

4

F

7

J

9

L

5

D

2

M

6

P

8

N

 

Therefore, 396824 will be coded as QLPNMF.

 

6.         If 'lead' is called 'stick', 'stick' is called 'nib', 'nib' is called 'needle', 'needle' is called 'rope' and 'rope' is called 'thread', then what will be fitted in a fountain pen to write with it?

(a) stick                                        (b) lead            

(c) needle                                   (d) nib

 

Explanation: (c)

A nib is fitted in a fountain pen. But nib is called needle.

So, the needle will be fitted in the pen.

 

 

7.         In a certain code language, 'si po re' means 'book is thick', 'ti ma re' means 'bag is heavy', 'ka si' means 'interesting book' and 'de ti' means 'that bag'. Which of the following means 'that is interesting' in that code language?

(a) ka de re                    (b) ti po ka        

(c) de si re                      (d) ke re ma

 

Explanation: (a)

Common to 'book is thick' and 'bag is heavy' is 'is'. And common to their codes is 're'.

Therefore, 're' is the code for 'is'. Similarly, we may obtain the following:

Word

Code

book

si

interesting

ka

thick

po

that

de

bag

ti

heavy

ma

is

re

 

Hence, 'ka de re' means 'that is interesting'.

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