You can prepare effectively for CAT Level-wise Tests for CAT with this dedicated MCQ Practice Test (available with solutions) on the important topic of "Test Level 1: Coding Decoding". These 20 questions have been designed by the experts with the latest curriculum of CAT 2026, to help you master the concept.
Test Highlights:
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In a certain coding system, 'TEN' is coded as 256 and 'SIXTY' is coded as 19827. How will you code 'SIXTEEN' in this coding system?
Detailed Solution: Question 1
In a certain coding system, 'CAMEL' is coded as 25106, 'LION' is coded as 6793 and 'TIRE' is coded as 4780. How will you code 'ELITE' in this coding system?
Detailed Solution: Question 2
Directions: This question is based on five words given below.
DROP TAKE BACK NEED QUIT
(Note: The word formed after performing the given operations may or may not be a meaningful English word)
If third letter of each word is exchanged by first letter of the same word and the last letter of all the words is replaced by the previous letter in the English alphabetical series, then how many words thus formed have either third or fourth letter as a vowel?
Detailed Solution: Question 3
Directions: This question is based on five words given below.
AWAY TAKE GRAT PISS DEAL
(Note: The word formed after performing the given operations may or may not be a meaningful English word)
If all the letters of each word are arranged alphabetically and then the words so formed are arranged in alphabetical order, then what will be the second letter of the third word?
Detailed Solution: Question 4
If 'orange' is called 'butter', 'butter' is called 'soap', 'soap' is called 'ink', 'ink' is called 'honey' and 'honey' is called 'orange', then which of the following is used for washing clothes?
Detailed Solution: Question 5
Directions: Study the given information carefully and answer the given question.
In a certain code language,
'Markets are hi-tech today' means 'pa la ka ma'
'Paisa transfer through markets' means 'ka na sj si'
'Hi-tech paisa easy today' means 'la pa na me'
'Today man through time' means 'si mn ke la'
Q. What is the possible code for 'time paisa transfer'?
Detailed Solution: Question 6
Directions: Study the given information carefully and answer the given question.
In a certain code language,
'Markets are hi-tech today' means 'pa la ka ma'
'Paisa transfer through markets' means 'ka na sj si'
'Hi-tech paisa easy today' means 'la pa na me'
'Today man through time' means 'si mn ke la'
Q. What is the code for 'transfer'?
Detailed Solution: Question 7
Directions: Study the given information carefully and answer the given question.
In a certain code language,
'Markets are hi-tech today' means 'pa la ka ma'
'Paisa transfer through markets' means 'ka na sj si'
'Hi-tech paisa easy today' means 'la pa na me'
'Today man through time' means 'si mn ke la'
Q. What will be the code for 'markets'?
Detailed Solution: Question 8
Directions: Study the given information carefully and answer the given question.
In a certain code language,
'Markets are hi-tech today' means 'pa la ka ma'
'Paisa transfer through markets' means 'ka na sj si'
'Hi-tech paisa easy today' means 'la pa na me'
'Today man through time' means 'si mn ke la'
Q. What does code 'me' mean?
Detailed Solution: Question 9
Directions: The question below consists of a group of digits followed by combinations of letters/symbols. You have to find out which of the combinations correctly represents the group of digits, based on the following coding system and the conditions given below. Mark that combination as your answer. If none of the combinations correctly represents the group of letters, give option (5), i.e. 'None of these' as the answer.

Conditions:
(i) If the first digit is odd and the last digit is even, then the code has to be exchanged.
(ii) If both digits, first and last are even, then both have to be coded on the basis of the first digit.
(iii) If the first digit is even and the second digit is odd, then both have to be coded on the basis of the odd digit.
Q. Find the correct combination of codes for the following group of digits.
384695
Detailed Solution: Question 10
Directions: The question below consists of a group of digits followed by combinations of letters/symbols. You have to find out which of the combinations correctly represents the group of digits, based on the following coding system and the conditions given below. Mark that combination as your answer. If none of the combinations correctly represents the group of letters, give option (5), i.e. 'None of these' as the answer.

Conditions:
(i) If the first digit is odd and the last digit is even, then the code has to be exchanged.
(ii) If both digits, first and last are even, then both have to be coded on the basis of the first digit.
(iii) If the first digit is even and the second digit is odd, then both have to be coded on the basis of the odd digit.
Q. Find the correct combination of codes for the following group of digits.
765984
Detailed Solution: Question 11
Directions: The question below consists of a group of digits followed by combinations of letters/symbols. You have to find out which of the combinations correctly represents the group of digits, based on the following coding system and the conditions given below. Mark that combination as your answer. If none of the combinations correctly represents the group of letters, give option (5), i.e. 'None of these' as the answer.

Conditions:
(i) If the first digit is odd and the last digit is even, then the code has to be exchanged.
(ii) If both digits, first and last are even, then both have to be coded on the basis of the first digit.
(iii) If the first digit is even and the second digit is odd, then both have to be coded on the basis of the odd digit.
Q. Find the correct combination of codes for the following group of digits.
584632
Detailed Solution: Question 12
In a certain coding system, 'PAGES' is coded as 23719 and 'GUEST' is coded as 75196. How will you code 'STAGE' in this coding system?
Detailed Solution: Question 13
If cloud is called white, white is called rain, rain is called green, green is called sky, sky is called blue and blue is called water, then where do the birds fly?
Detailed Solution: Question 14
Directions: This question is based on five words given below.
DROP TAKE BACK NEED QUIT
(Note: The word formed after performing the given operations may or may not be a meaningful English word)
How many letters are there in the English alphabetical series between the second letter of the second word from the right and third letter of the first word from the left?
Detailed Solution: Question 15
Directions: This question is based on five words given below.
SIR DEV GOT MIC SAT
(Note: The word formed after performing the given operations may or may not be a meaningful English word)
How many letters are there in the English alphabetical series between the third letter of the second word from the right and second letter of the fourth word from the left?
Detailed Solution: Question 16
If 'black' means 'pink', 'pink' means 'blue', 'blue' means 'white', 'white' means 'yellow', 'yellow' means 'red' and 'red' means 'brown', then what is the colour of sky?
Detailed Solution: Question 17
If in a certain code language, ENGLAND is written as 1234526 and FRANCE is written as 785291, then how is GREECE written in that language?
Detailed Solution: Question 18
In a certain code, 'MEAN' is written as $57* and 'DOME' is written as 93$5. How is 'MOAN' written in that code?
Detailed Solution: Question 19
Directions: In the question below is given a group of letters, followed by some combinations of digits/symbols numbers. You have to find out which of the combinations correctly represents the code based on the given coding system.

(i) If the first letter is a consonant and the last letter is a vowel, the codes of both are to be interchanged.
(ii) If the first and the last letters are consonants, both are to be coded as per the code of the last letter.
(iii) If the first letter is vowel and the last letter is a consonant both are to be coded as @.
Q. EAQRF
Detailed Solution: Question 20
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