Sub Inspector of Police (Trainee) / Asst Jailer Gr I / Excise Inspector — 2015 — Official Paper — Kerala PSC PYQ Practice with Answers

Correct answer (Option D):\nTo find the day after 54 days, divide 54 by 7 to determine the number of weeks and the remaining odd days.\n54 ÷ 7 = 7 weeks with a remainder of 5 days.\nCounting 5 days forward from Monday gives: Tuesday, Wednesday, Thursday, Friday, Saturday.\nTherefore, it will be Saturday. Option D is correct.\n\nWhy others are wrong:\nOptions A, B, and C do not account for the correct remainder of 5 odd days added to Monday.\n\nStudy tip:\nCalendar problems rely heavily on finding the remainder modulo 7. Every 7 days, the cycle repeats the same day of the week.

Correct answer (Option B):\nThe pattern involves reversing the word and changing the letters.\nWord: SCHOOL\nReversed: L O O H C S\nNow apply shifts to the positions:\nThe first and last letters remain unchanged, while the middle letters are incremented by +1 position in the alphabet.\nL (+0) → L\nO (+1) → P\nO (+1) → P\nH (+1) → I\nC (+1) → D\nS (+0) → S\nResult: LPPIDS\n\nApplying this pattern to COMPUTER:\nReversed: R E T U P M O C\nShift middle letters by +1:\nR (+0) → R\nE (+1) → F\nT (+1) → U\nU (+1) → V\nP (+1) → Q\nM (+1) → N\nO (+1) → P\nC (+0) → C\nResult: RFUVQNPC. Option B is correct.\n\nWhy others are wrong:\nOptions A, C, and D do not follow the correct combination of word reversal and targeted letter shifting.\n\nStudy tip:\nAlways look for symmetry or word reversal patterns first if the letter count matches perfectly in coding-decoding questions.

Correct answer (Option D):\nThis is an alternating series consisting of subtraction and addition patterns.\nStep 1: 26 - 1 = 25\nStep 2: 25 + 2 = 27\nStep 3: 27 - 1 = 26\nStep 4: 26 + 2 = 28\nStep 5: 28 - 1 = 27\nFollowing this alternating pattern (-1, +2, -1, +2, -1), the next operation must be +2.\nStep 6: 27 + 2 = 29.\nOption D is correct.\n\nWhy others are wrong:\nOptions A, B, and C do not follow the alternating mathematical pattern established by the sequence.\n\nStudy tip:\nIf a series goes down and up continuously, try splitting it into two alternating sub-series or trace the successive steps step-by-step.

Correct answer (Option B):\nAmong the given numbers, 63 is a composite number because it can be divided by 3, 7, 9, and 21 (9 × 7 = 63).\nAll other numbers in the list—43, 53, 73, and 83—are prime numbers, meaning they only have 1 and themselves as factors.\nTherefore, 63 is the odd one out. Option B is correct.\n\nWhy others are wrong:\nOptions A, C, and D are all prime numbers and fit the primary classification group of the set.\n\nRemember:\nPrime and composite number classifications are standard criteria used to find the odd one out in numerical aptitude questions.

Correct answer (Option A):\nThe word 'wary' means feeling or showing caution about possible dangers or problems. Synonyms include cautious, careful, alert, and vigilant.\nTherefore, 'Vigilant' is the word that best expresses its meaning. Option A is correct.\n\nWhy others are wrong:\nOption B (Intelligent) refers to mental capacity. Option C (Accurate) means correct or precise. Option D (Tired) implies exhaustion. None of these align with the definition of being cautious.\n\nStudy tip:\nBuilding a vocabulary log with direct synonyms helps tackle vocabulary questions effectively in uniform service exams.