Practice Questions: Coding & Decoding | Logical Reasoning for CLAT PDF Download

Q1: In a certain code 'MISSIONS' is written as 'MSIISNOS'. How is 'ONLINE' written in that code?
(a) OLNNIE
(b) ONILEN
(c) NOILEN
(d) LNOENI
Ans:(a)
First and last letters remain the same. The others interchange their positions in pairs of two. So, NL becomes LN, IN becomes NI, so the code for ONLINE will be OLNNIE.

Q2: In a certain code 'TIGER' is written as 'QDFHS'. How is 'FISH' written in that code?
(a) GERH
(b) GRHE
(c) GREH
(d) GHRE
Ans: (b)

Reverse the word and move each letter –1. The reverse of FISH is HSIF; subtract 1 from each letter of HSIF. So the code for FISH becomes GRHE.

Q3: In a certain code 'FROZEN' is written as 'OFAPSG'. Then how would 'MOLTEN' be written in that code?
(a) OFPOMN
(b) OFSMPN
(c) OFUMPN
(d) OFUNPM
Ans: (c)
Reverse the word and move each letter +1. The reverse of MOLTEN is NETLOM; add 1 to each letter of NETLOM. So the code for MOLTEN becomes OFUMPN.

Q4: In a certain code 'ROAR' is written as 'URDU'. How is 'URDU' written in that code?
(a) V X D Q
(b) XUGX
(c) ROAR
(d) VSOV
Ans: (b)
Each letter moves +3. Add 3 to each letter of URDU, so the code for URDU will be XUGX.

Q5: In a certain code 'LIMCA' is written as 'HJLDZ'. Which of the following words is written as 'IFWJBP'?
(a) M E X I C O
(b) MERCURY
(c) JAPAN
(d) MIDNIGHT
Ans: (a)
Each letter moves +1, -1, alternately except for L, which is –4. Add 4 to I, then -1, +1 alternately to the remaining letters. The word will be MEXICO.

Q6: In a certain code 'HILTON' is written as 'I H T L N O'. How is 'BILLION' written in that code?
(a) IBLLION
(b) IBOILLN
(c) IBLLOIN
(d) IBLOILN
(e) IBOLLIN
Ans: (c)
Letters are interchanged in each pair. So the code for BI becomes IB, IO becomes OI. The code for BILLION will be IBLLOIN.

Q7: If in the English alphabet, every alternate letter from B onwards is written in small letters while others are written in capitals, then how will the 3rd day from Tuesday will be coded?
(a) W e D N e S d A Y
(b) W E d n E S d A Y
(c) T H U R S d A Y
(d) f r I d A Y
Ans: (d)
The small letters are b, d, f, h, j, l, n, p, r, t, v, x, z. The third day from Tuesday will be Friday, and the code will be frIdAY.

Q8: If the letters of the word 'CYCLINDER' are arranged alphabetically, then which letter would be farthest from the first letter of the word?
(a) N
(b) E
(c) Y
(d) R
Ans: (c)
The last letter is ‘Y’.

Q9: In a certain code 'CERTAIN' is coded as 'BFQUZJM'. How is 'MUNDANE' coded in that code?
(a) LVMEZOD
(b) NTCOMBF
(c) NTOCNBF
(d) LTMCZOF
Ans: (a)
Each letter moves -1, +1 alternately. So, M - 1 = L, U + 1 = V, and so on. The code for MUNDANE will be LVMEZOD.

Q10: In a certain code 'SEQUENCE' is coded as 'FDOFVRFT'. How is 'CHILDREN' coded in that code?
(a) OFESJMID
(b) OFSEMJID
(c) OFSEJIMD
(d) OFSEJMID
Ans:(b)
Reverse the word and +1 to each letter. The reverse of CHILDREN is NERDLIHC. Add 1 to each letter. Therefore, the code for CHILDREN becomes OFSEMJID.