MCQ
Reasoning: Coding-Decoding MCQ - Practice Questions with Answers
Solve 40 Reasoning: Coding-Decoding questions for RAS/RPSC preparation.
Practice questions
Q1In a certain code, SUM is written as 53 because the alphabet positions of its letters are added. Which of the following statements is incorrect in the same code?
The code is formed by adding the alphabet positions of the letters. SUM is 19 + 21 + 13 = 53, so the rule is clear. DOG is 4 + 15 + 7 = 26, CAT is 3 + 1 + 20 = 24, and BAT is 2 + 1 + 20 = 23. For PEN, the total is 16 + 5 + 14 = 35, not 36. Therefore the incorrect statement is PEN = 36.
Q2In a certain code for a four-letter word, the 1st and 3rd letters are moved one step forward in the alphabet, while the 2nd and 4th letters are moved one step backward. Which of the following statements are correctly coded? I. FISH - GHTG II. GAME - HZND III. BIRD - CHQC
The rule alternates by position. In FISH, F moves forward to G, I moves backward to H, S moves forward to T, and H moves backward to G, so GHTG is correct. In GAME, G becomes H, A becomes Z, M becomes N, and E becomes D, so HZND is correct. In BIRD, B becomes C, I becomes H, R should become S, and D should become C. The correct code is CHSC, not CHQC. Therefore only I and II are correctly coded.
Q3In a certain code, a word is coded as: position of the first letter + position of the last letter - number of letters in the word. Match the words in List I with their codes in List II. List I: I. LAMP, II. MINT, III. COLD, IV. RISK. List II: 1. 3, 2. 24, 3. 25, 4. 29.
Use alphabet positions A = 1, B = 2 and so on. For LAMP, L is 12 and P is 16; 12 + 16 - 4 = 24, so I matches 2. For MINT, 13 + 20 - 4 = 29, so II matches 4. For COLD, 3 + 4 - 4 = 3, so III matches 1. For RISK, 18 + 11 - 4 = 25, so IV matches 3. The complete matching is I-2, II-4, III-1, IV-3.
Q4In a certain code, each word is written as the sum of the alphabet positions of its letters. Which given code is incorrect?
Use the alphabet positions A = 1, B = 2, C = 3, and so on. ACE gives 1 + 3 + 5 = 9, BAD gives 2 + 1 + 4 = 7, and CAB gives 3 + 1 + 2 = 6. For FACE, the positions are F = 6, A = 1, C = 3 and E = 5. Their sum is 6 + 1 + 3 + 5 = 15, not 16. Therefore FACE = 16 is the incorrect code.
Q5In a code language, each letter is replaced by the letter that comes 3 places after it in the English alphabet. For example, BRAVE is written as EUDYH. Which of the following coded words is incorrect?
The rule is a simple +3 shift for every letter. TRAIN becomes WUDLQ, LEMON becomes OHPRQ, and RIVER becomes ULYHU, so these three are correctly coded. For POWER, the letters change as P to S, O to R, W to Z, E to H, and R to U. Therefore POWER should be written as SRZHU, not SRZHV. The incorrect coded pair is POWER - SRZHV.
You've seen 5 of 40 sample questions
Unlimited practice on Reasoning: Coding-Decoding comes with the RAS Test Series + Practice pack or Gate Pass.
More questions
6In a certain code, every vowel is replaced by the next vowel in the order A, E, I, O, U, A, while consonants remain unchanged. Consider the following statements: I. CAT is coded as CET. II. FOOD is coded as FUUD. III. RICE is coded as ROCE. Which statements are correct?
7In a certain code, each letter is replaced by its opposite letter in the English alphabet, so CAT is written as XZG. Which statement is correct under the same code?
8In a certain code, ROSE is written as 18-15-19-5, because each letter is replaced by its alphabet position. Which code represents PLANT?
9In a certain code, the letters of a word are first written in reverse order, and then each letter is moved one step forward in the alphabet. Which one of the following codes is incorrect?
10In a certain code, MANGO is written as 13-1-14-7-15. Which statement is correct about the same code?
11In a certain code, BRICK is written as CSJDL. Read the following statements and choose the correct combination. I. STONE will be written as TUPOF. II. PLANT will be written as QMBPU. III. RIVER will be written as SJWFS.
12In a certain code, every letter of a word is moved two places backward in the alphabet. Read the statements and choose the incorrect one. I. HOUSE = FMSQC II. WATER = UYRCP III. CHAIR = AFGGP IV. TABLE = RYZJC
13In a certain code, a six-letter word is divided into three pairs and the letters within each pair are interchanged. For example, MARKET is written as AMKRTE. How will CANDLE be written?
14In a certain code, TRAIN is written as VTCKP. In the same code, how will PLANT be written?
15In a code language, 'K P' means 'red flower', 'P L' means 'blue flower', and 'K N' means 'red apple'. Which of the following statements are definitely correct? I. P means flower II. K means red III. L means apple