Coding-Decoding Practice Questions


In Aptitude Test, one of the most important sections is the Coding-Decoding section. In the aptitude test of coding-decoding several questions may be asked. We have seen all the different types of aptitude test questions from this section in the chapter on coding decoding. Non verbal reasoning has a vast collection of questions in Coding-Decoding.

Browse more Topics under Coding Decoding

Aptitude Test – Coding Decoding Practice Questions

A Code is a ‘system of signals’. Therefore, Coding is a method of transmitting a message between the sender and the receiver without a third person knowing it. The Coding arid Decoding Test is set up to judge the candidate’s ability to decipher the rule that codes a particular word/message and break the code to decipher the message.

Aptitude Test: Letter Coding

Part A

In these questions, the real alphabets in a word are replaced by certain other alphabets according to a specific rule to form its code. The candidate is required to detect the common rule and answer the questions accordingly.

Q1: If in a certain language, MADRAS is coded as NBESBT, how is BOMBAY coded in that code? (S.S.C. 1994)

(a) CPNCBX (6) CPNCBZ (c) CPOCBZ (d) CQOCBZ (e) None of these

Q2: In a certain code, TRIPPLE is written as SQHOOKD. How is DISPOSE written in that code? (Central Excise, 1995)

(a) CHRONRD (6) DSOESPI (c) ESJTPTF (d) ESOPSID (e) None of these

Q3: If in a code language. COULD is written as BNTKC and MARGIN is written as LZQFHM, how will MOULDING be written in that code?

(a) CHMFINTK (6) LNKTCHMF (c) LNTKCHMF (d) NITKHCMF (e) None of these

Q4: In a certain code, MONKEY is written as XDJMNL. How is TIGER written in that code? (Assistant Grade, 1998)

(a) QDFHS (6) SDFHS (c) SHFDQ (d) UJHFS (e) None of these

Q5: If FRAGRANCE is written as SBHSBODFG, how can IMPOSING be written?

(a) NQPTJHOJ (6) NQPTJOHI (c) NQTPJOHJ (d) NQPTJOHJ (c) None of these

Part B

Q6: In a certain code, COMPUTER is written as RFUVQNPC. How is MEDICINE written in the same code? (Bank P.O. 1997)

(a) EOJDJEFM (6) EOJDEJFM (c) MFEJDJOE (d) MFEDJJOE (e) None of these

Q7: If in a certain language. GAMBLE is coded as FBLCKF, how is FLOWER coded in that code?


Q8: If in a certain language, NATURE is coded as MASUQE, how is FAMINE coded in that code?


Q9: If in a certain code. TEACHER is written as VGCEJGT, how would DULLARD be written in the same code?

(a) FWMNCTF (6) FWNNBTE (c) FWNNCSF (d) FWNNCTF (e) None of these

Q10: If in a certain language FASHION is coded as FOIHSAN. how is PROBLEM coded in that code?


Find Your Answers Here

Q1: (b), Q2: (a), Q3: (c), Q4: (a), Q5: (d), Q6: (a), Q7: (b), Q8: (d), Q9: (d), Q10: (b)

Aptitude Test: Number Coding

In these questions, either numerical code values are assigned to a word or alphabetical code letters are assigned to the numbers. The candidate is required to analyse the code as per the directions.

Part A

Q1: If DELHI is coded as 73541 and CALCUTTA as 82589662. how can CALICUT be coded? (Assistant Grade. 1995)

(a) 5279431 (6) 5978213 (c) 8251896 (d) 8543691

Q2: In a certain code. RIPPLE is written as 613382 and LIFE is written as 8192. How is PILLER written in that code?

(a) 318826 (ft) 318286 (c) 618826 (d) 338816

Q3: If ROSE is coded as 6821, CHAIR is coded as 73456 and PREACH is coded as 961473, what will be the code for SEARCH? (Assistant Grade, 1993)

(a) 246173 (6) 214673 (c) 214763 (d)^216473

Q4: If in a certain code, TWENTY is written as 863985 and ELEVEN is written as 323039, how is TWELVE written in that code?

(a) 863203 (ft) 863584 (c) 863903 (d) 863063

Q5: If the letters in PRABA are coded as 27595, and THILAK are coded as 368451, how can BHARATHI be coded? (U.D.C. 1993)

(a) 37536689 (ft) 57686535 (c) 96575368 (d) 96855368

Q6: If GIVE is coded as 5137 and BAT is coded as 924, how is GATE coded?

(a) 5427 (ft) 5724 (c) 5247 (d) 2547

non verbal reasoning

Part B

Q7: If PALE is coded as 2134, EARTH is coded as 41590, how is PEARL coded in that code?

(a) 29530 (6) 24153 (c) 25413 (d) 25430

Directions (Questions 8 to 12): If in a certain language, ENTRY is coded as 12345 and STEADY is coded as 931785, then state which is the correct code for each of the given words.


(a) 956169 (b) 196247 (c) 352123 (d) 312723


(a) 25196577 (b) 21732199 (c) 21362199 (d) 21823698

(a) 918731 (b) 954185 (c) 814195 (d) 614781

Find Your Answers Here

Q1: (c), Q2: (a), Q3: (b), Q4: (a), Q5: (c), Q6: (c), Q7: (b), Q8: (d), Q9: (b), Q10: (a).

Aptitude Test: Substitution

In this type of questions, some particular objects are assigned code names. Then a question is asked that is to be answered in the code language.

Part A

Q1: If white is called blue. blue is called red, red is called yellow, yellow is called green, green is called black, black is called violet and violet is called orange, what would be the colour of human blood? (Bank P.O. 1994)

(a) Red (6) Green (c) Yellow,. id) Violet (e) Orange

Q2: If room is called bed. bed is called window, window is called flower and flower is called cooler, on what would a man sleep?

(a) Window (b) Bed (c) Flower (d) Cooler (e) None of these

Q3: If orange is called butter, butter is called soap, soap is called ink, ink is called honey and honey is called orange, which of the following is used for washing clothes? (RBI. 1990)

(a) Honey (6) Butter (c) Orange id) Soap (e) Ink

Q4: If sand is called air, air is called plateau, plateau is called well, well is called island and island is called sky, then from where will a woman draw water?

(a) Well (6) Island (c) Sky (d) Air (e) None of these

Q5: If bangle is called cassette, cassette is called tablet table is called game and game is called cupboard, then which is played in the tape recorder?

(a) Bangle (6) Cassette (c) Table (d) Cupboard (e) None of these

Part B

Q6: If green means red, red means yellow, yellow means blue, blue means orange and orange means green, what is the colour of the clear sky? (R.R.B. 1998)

(a) Blue (6) Red (c) Yellow (d) Green (e) Orange

Q7: If cloud is called white, white is called rain, rain is called green, green is called air, air is called blue and blue is called water, where will the birds fly?

(a) Air (6) Cloud (c) White (d) Rain (e) Blue    (Bank P.O. 1991)

Q8: If book is called watch, watch is called bag, bag is called dictionary and dictionary is called window, which is used to carry the books?

(a) Dictionary (6) Bag (c) Book (d) Watch (e) None of these

Q9: If the animals which can walk are called swimmers, animals who crawl are called flying, those living in water are called snakes and those which fly in the sky are called hunters. then what will a lizard be called ? (Bank P.O. 1991)

(a) Swimmers (6) Snakes (c) Flying (d) Hunters (e) None of these

Q10: If water is called food, food is called tree, free is called sky, sky is called wall, on which of the following grows a fruit?

(a) Water (b) Food (c) Sky (d) Tree (e) Wall

Find Your Answers Here

Q1: (c), Q2: 9a), Q3: 9e), Q4: (b), Q5: (c), Q6: (c), Q7: (e), Q8: (a), Q9: (c), Q10: (c).

Share with friends
Customize your course in 30 seconds

Which class are you in?

Get ready for all-new Live Classes!
Now learn Live with India's best teachers. Join courses with the best schedule and enjoy fun and interactive classes.
Ashhar Firdausi
IIT Roorkee
Dr. Nazma Shaik
Gaurav Tiwari
Get Started

Download the App

Watch lectures, practise questions and take tests on the go.
Customize your course in 30 seconds

Which class are you in?

No thanks.