Practice MCQ Questions and Answer on Coding and Decoding
1.
In a certain code language, ROUTINE is written as VMRGFLI. How will CRUELTY be written in that code language?
(A) VOCVZRL
(B) VPCVZRL
(C) VPVCZRL
(D) WPCVZRL
Solution:
Answer & Solution Answer: Option E Solution: Each letter in the word is replaced by the letter which occupies the same position from the other end of the English alphabet, and the group of letters so obtained is then written in the reverse order to get the code. Thus, we have : CRUELTY => XIFVOGB => BGOVFIX.
2.
In a certain code, BASIC is written as DDULE. How is LEADER written in that code?
(A) NGCFGT
(B) NHCGGU
(C) OGDFHT
(D) OHDGHU
Solution:
The letters at the odd-numbered positions in the word are each moved two steps forward while those at the even-numbered positions are each moved three steps forward to obtain the corresponding letters of the code.
3.
If Dust is called Air, Air is called Fire, Fire is called Water, Water is called Colour, Colour is called Rain and Rain is called Dust, where do Fish live ?
(A) Dust
(B) Fire
(C) Colour
(D) Water
Solution:
Generally, Fishes lives in Water and Water is called Colour in the code. So Fishes live in Colour.
4.
If TRUTH is coded as SUQSTVSUGI, then the code for FALSE will be
(A) EGZBKMRDE
(B) EGZKMRTDF
(C) EGZBKMRTDF
(D) FGZBKNRTDF
Solution:
Each letter in the word is replaced by a set of two letters - one preceding it and other following it - in the code. Thus, T is replaced by SU, R is replaced by QS and so on.
5.
In a certain code, RAIL is written as KCTN and SPEAK is written as CGRUM. How will AVOID be written in that code?
(A) FKQXC
(B) KQXCF
(C) KRXCF
(D) KQVCB
Solution:
All the letters of the word, except the last letters, are written in the reverse order and in the group of letters so obtained, each letter is moved two steps forward to get the code. Thus, we have : AVOID => IOVAD => KQXCF
6.
In a certain code, BROUGHT is written as SGFVAQN. How is SUPREME written in that code?
(A) DLDSTVQ
(B) DLDSRTO
(C) FNFSRTO
(D) RTOSDLD
Solution:
The last four letters of the word are written in the reverse order, followed by the first three letters in the same order. In the group of letters so obtained, each letter except the middle letter is moved one step backward while the middle letter is moved one step forward to get the code. Thus, we have : SUPREME => SUP/REME => EMER/SUP => DLD/SRTO.
7.
Find the correct option for the blank space .
ÃÂÃÂ B ÃÂÃÂ
ÃÂÃÂ 6 ÃÂÃÂ
ÃÂÃÂ 8 ÃÂÃÂ
ÃÂÃÂ D ÃÂÃÂ
ÃÂÃÂ J ÃÂÃÂ
ÃÂÃÂ 14 ÃÂÃÂ
ÃÂÃÂ 17 ÃÂÃÂ
ÃÂÃÂ M ÃÂÃÂ
ÃÂÃÂ N ÃÂÃÂ
ÃÂÃÂ _ ÃÂÃÂ
ÃÂÃÂ _ ÃÂÃÂ
ÃÂÃÂ S ÃÂÃÂ
(A) 18, 23
(B) 14, 19
(C) 16, 21
(D) 15, 20
Solution:
In the right side of the question there is a gap of 7 letters between B and J and 6 numbers between 6 and 14. Similarly, there is a gap of 3 letters between J and N. Therefore 3 numbers gap after 14 is 18. In the left side of the question there is a gap of 8 letters between D and M and 6 numbers between 8 and 17. Similarly, there is a gap of 5 letters between M and S. Therefore 5 numbers gap after 17 is 23.
8.
In a certain code, MOTHER is written as ONHURF. How will ANSWER be written in that code?
(A) NBXSSE
(B) NBWRRF
(C) MAVSPE
(D) NBWTRF
Solution:
Divide the word into three groups of two letters each and write the letters of each group in the reverse order. In the group of letters so obtained, the second, fourth and sixth letters are each moved one step forward to get the code. Thus, we have : AN SW ER => NA WS RE => NBWTRF.
9.
If in a certain language, MIRACLE is coded as NKUEHRL, then how is GAMBLE coded in that language?
(A) JDOCMF
(B) CLEMNK
(C) HCPFQK
(D) AELGMN
Solution:
The first, second, third, fourth, fifth, sixth and seventh letters in the word are moved one, two, three, four, five, six and seven steps forward respectively to obtain the corresponding letters of the code.
10.
If in a certain language PROSE is coded as PPOQE, how is LIGHT coded in that code ?
(A) LIGFT
(B) LGGHT
(C) LGGFT
(D) LLGFE
Solution:
In the given code PROSE = PPOQE The first, third and fifth letters are same but in the place of second and fourth letters previous two letters are used. So, LIGHT = LGGFT.