Question 1

In the following question, four numbers are given. Three of them are perfect squares and one is not. Select the number which is not a perfect square (odd number out).

Accepted Answer

Introduction / Context: This odd one out question is based on the concept of perfect squares. It is a common type of problem in quantitative aptitude sections, where the candidate must recognise numbers that can be written as the square of an integer. Identifying perfect squares quickly is useful in many topics, such as simplifying roots, solving equations, and working with geometric areas. Given Data / Assumptions: - The options are 169, 421, 529, 289, and 361. - A perfect square is an integer that can be expressed as n^2 for some integer n. - It is given or implied that three of the numbers are perfect squares and one is not. - We must select the number that is not a perfect square as the odd one out. Concept / Approach: The approach is to test each number to see whether it is a perfect square. For three digit numbers, we can check nearby squares such as 10^2 = 100, 11^2 = 121, up to about 20^2 = 400 and slightly beyond. If a number matches one of these known squares, it is a perfect square. If it does not, then it is not a perfect square. The single number that fails this test will be our answer. Step-by-Step Solution: Step 1: Check 169. 13^2 = 169, so 169 is a perfect square.Step 2: Check 529. 23^2 = 529, so 529 is a perfect square.Step 3: Check 289. 17^2 = 289, so 289 is a perfect square.Step 4: Check 361. 19^2 = 361, so 361 is also a perfect square.Step 5: Now check 421. The square of 20 is 400 and the square of 21 is 441. 421 lies between 400 and 441 but is not equal to either of them.Step 6: Therefore, there is no integer n such that n^2 = 421, so 421 is not a perfect square and is the odd one out. Verification / Alternative Check: We can verify again by examining the differences from nearby squares. 421 - 400 = 21 and 441 - 421 = 20, which shows that 421 is in between two consecutive perfect squares. A number that lies strictly between consecutive perfect squares cannot itself be a square. On the other hand, 169, 289, 361, and 529 match exactly with 13^2, 17^2, 19^2, and 23^2 respectively. This confirms that the pattern is correct: four options are perfect squares and 421 is not. Why Other Options Are Wrong: 169 is not the odd one out because it is the square of 13 and clearly a perfect square. 529 is also not odd because it is the square of 23. 289 is a perfect square as 17^2, so it fits the main group. 361 is equal to 19^2, so it also belongs with the other perfect squares. Since these four all have integer square roots, none of them can be chosen as the odd one out. Common Pitfalls: Sometimes learners may think that 421 looks special because of its digits and pick it without checking the square property, which is just a guess. Others may miscalculate squares of 19 or 23 and become uncertain about 361 or 529. To avoid such mistakes, it is helpful to memorise squares of integers at least up to 25 and to practice verifying by checking the range between consecutive squares. Doing so makes odd one out questions based on perfect squares straightforward and fast to solve. Final Answer: 421

Question 2

In the following question, four terms related to vehicles are given. Three are complete vehicles and one is only a part of a vehicle. Select the odd word from the given alternatives.

Accepted Answer

Introduction / Context: This question is a simple classification based odd one out problem using everyday transport related words. It tests whether the learner can distinguish between whole vehicles and parts that make up a vehicle. Such questions are common in verbal and logical reasoning sections and rely mainly on general awareness of common objects rather than advanced mathematics. Given Data / Assumptions: - The options are Car, Cycle, Tyre, Truck, and Bus. - Car, Cycle, Truck, and Bus are all names of complete vehicles used for transport. - A Tyre is a component part that is fitted onto the wheel of many vehicles. - We assume standard meanings of these terms as used in everyday language and road transport contexts. Concept / Approach: The main idea is to group items based on whether they represent a complete vehicle or only a part of a vehicle. Whole vehicles like cars, cycles, trucks, and buses are independent units that people can ride or drive. A tyre cannot be used alone for transport; it functions only as a part of these vehicles. The correct odd one out is therefore the term that does not represent a complete vehicle. Step-by-Step Solution: Step 1: Consider Car. A car is a full motor vehicle that people drive on roads.Step 2: Consider Cycle. A cycle, usually a bicycle, is a complete non motorised vehicle that a person can ride.Step 3: Consider Truck. A truck is a large motor vehicle designed to carry heavy goods.Step 4: Consider Bus. A bus is a large motor vehicle used to carry many passengers at once.Step 5: Consider Tyre. A tyre is a rubber component that fits around a wheel and helps the vehicle move smoothly on the road.Step 6: Since Car, Cycle, Truck, and Bus each refer to entire vehicles, while Tyre is only a part used in several vehicles, Tyre is clearly the odd one out. Verification / Alternative Check: We can verify this by imagining each item separately. If you have a car, cycle, truck, or bus, you can travel from one place to another. They are complete modes of transport. However, having only a tyre does not allow you to travel; it must be attached to a vehicle. This thought experiment confirms that Tyre falls into a different category from the others and is correctly chosen as the odd one out in this list. Why Other Options Are Wrong: Car is not the odd one out because it is a full vehicle similar in function to truck and bus, and like cycle it is used for transport. Cycle is also a complete vehicle, although non motorised, and so it still belongs with the other vehicles. Truck is a large goods vehicle and fits the transport category clearly. Bus is a passenger vehicle that again fits the same category. These four terms all refer to complete vehicles and therefore are not the odd ones in this problem. Common Pitfalls: Some learners may be tempted to choose Cycle because it is not motorised like car, truck, or bus. However, the pattern used in this question is completed vehicle versus component, not motorised versus non motorised. Another pitfall is to think that Tyre appears less important because it is smaller, but the real distinction is its role as a part, not a whole. Remember to classify items based on their functional category to answer such questions correctly in exams. Final Answer: Tyre

Question 3

In the following question, select the odd group of letters from the given alternatives based on the alphabetical step pattern.

Accepted Answer

Introduction / Context: This odd man out question from verbal reasoning tests your ability to see hidden patterns in groups of letters. Many aptitude exams use such alphabet based series to check how quickly you can convert letters into positions and notice regular jumps. Given Data / Assumptions: Letter groups: RTVX, GIKM, DFIK, LNPR. You must select the one group that does not follow the same alphabetical jump rule as the others. Use standard English alphabet positions: A = 1, B = 2, ..., Z = 26. Concept / Approach: The main idea is to convert each letter into its numerical position and then check the difference between consecutive letters. If three groups show a constant step, and one group breaks that pattern, that breaking group is the odd one out. Step-by-Step Solution: RTVX: R = 18, T = 20, V = 22, X = 24. Jumps are +2, +2, +2. GIKM: G = 7, I = 9, K = 11, M = 13. Jumps are +2, +2, +2. LNPR: L = 12, N = 14, P = 16, R = 18. Jumps are +2, +2, +2. DFIK: D = 4, F = 6, I = 9, K = 11. Jumps are +2, +3, +2, so the pattern is not uniform. Hence DFIK alone does not maintain a constant +2 step throughout the group. Verification / Alternative check: You can quickly verify by writing just the differences in each group: RTVX gives 2,2,2; GIKM gives 2,2,2; LNPR gives 2,2,2; DFIK gives 2,3,2. Since only DFIK has a middle jump of 3 instead of 2, this confirms that DFIK breaks the consistent pattern followed by the other three options. Why Other Options Are Wrong: RTVX: All letters are spaced by a fixed +2 step, so it matches the main rule. GIKM: Also follows the same +2, +2, +2 jump and cannot be odd. LNPR: Again maintains a +2 step throughout, so it belongs to the majority pattern. Common Pitfalls: Candidates sometimes look only at the idea of letters being “skipped” and do not calculate the exact step size. Because every group appears to skip letters, DFIK can look normal at a glance. Always convert letters to numbers and check every jump. Ignoring even one difference can cause you to miss the irregular group. Final Answer: DFIK

Question 4

Four groups of three numbers are given. In each group the second and third numbers follow a rule based on the first number. Three groups share the same addition rule. Select the odd group of numbers.

Accepted Answer

Introduction / Context: This question checks your understanding of simple number patterns and analogies. You are given small groups of numbers where the second and third numbers are derived from the first by a simple rule, and you must detect which group does not follow the dominant pattern. Given Data / Assumptions: Groups: (2, 3, 4), (4, 5, 6), (6, 7, 8), (4, 6, 8). The second and third numbers should be related to the first using the same rule for most groups. We need to find the group that fails to follow that common rule. Concept / Approach: For such three term groups, a very common rule is to obtain the second and third terms by adding fixed numbers to the first term. We test if the second equals first plus some constant and the third equals first plus another constant across the groups and see which set breaks the pattern. Step-by-Step Solution: For (2, 3, 4): 3 = 2 + 1 and 4 = 2 + 2. For (4, 5, 6): 5 = 4 + 1 and 6 = 4 + 2. For (6, 7, 8): 7 = 6 + 1 and 8 = 6 + 2. For (4, 6, 8): 6 = 4 + 2 and 8 = 4 + 4, so the increments are +2 and +4, not +1 and +2. Thus three groups follow the pattern (first + 1, first + 2), but (4, 6, 8) does not. Verification / Alternative check: You can also subtract the first number from the other two numbers in each group and look only at the resulting pair of differences. The first three sets give difference pairs (1, 2), while the last gives (2, 4). Since only the last pair of differences is different, (4, 6, 8) is confirmed as the odd group. Why Other Options Are Wrong: (2, 3, 4): Follows the rule second = first + 1 and third = first + 2. (4, 5, 6): Also matches the same +1, +2 pattern. (6, 7, 8): Again clearly follows +1, +2 from the first number. Common Pitfalls: Sometimes candidates only check if the numbers are consecutive and miss that the rule is specifically linked to the first term. (4, 6, 8) looks like a simple progression with difference 2, but the structure relative to the first element is different. Always express the second and third terms directly in terms of the first term to see the intended pattern clearly. Final Answer: (4, 6, 8)

Question 5

Find the odd item from the following alternatives, where most items are direct sources of light.

Accepted Answer

Introduction / Context: This question belongs to basic general aptitude and tests whether you can classify objects according to their primary function. Here the key idea is to separate direct sources of light from supporting devices that do not themselves emit light. Given Data / Assumptions: Items: Torch, Battery, Candle, Lamp. Three items are direct light sources used for illumination. One item is mainly a power source or accessory, not a light source by itself. Concept / Approach: We think about how each object is used in daily life. A direct light source is something that gives light on its own when activated. A supporting object helps other devices to work but does not emit light independently. By classifying each option, the odd one becomes clear. Step-by-Step Solution: A torch produces light when switched on and is used directly for illumination. A candle burns and gives light, so it is itself a light source. A lamp, whether electric or oil based, is designed to emit light. A battery, however, stores electrical energy and supplies power to devices like torches or lamps but does not glow or give light on its own. Therefore, battery is functionally different from the other three options. Verification / Alternative check: You can imagine a dark room and ask which objects, if present alone, could light up the room. A torch, a candle, or a lamp can do so independently. A battery by itself, without any connected light producing device, cannot. This simple thought experiment confirms that a battery is not a direct source of light. Why Other Options Are Wrong: Torch: Directly used for lighting and clearly similar to a lamp. Candle: Independently emits light and heat, so it matches the idea of a light source. Lamp: Designed specifically to illuminate an area and fits with torch and candle. Common Pitfalls: Some learners may think in terms of modern or traditional devices and get distracted by design differences. The real classification is based on whether the item itself emits light or only supplies energy. Keeping focus on the core function avoids confusion and leads straight to the correct odd item. Final Answer: Battery

Question 6

Find the odd pair of letters from the following alternatives based on the fixed backward step in the alphabet.

Accepted Answer

Introduction / Context: This question checks your ability to see simple letter pair patterns in the English alphabet. Many odd man out problems use constant forward or backward steps between letters, and you must spot which pair breaks the rule. Given Data / Assumptions: Letter pairs: CA, FD, KI, TQ. We use alphabet positions A = 1, B = 2, ..., Z = 26. We look for a common difference between the first and second letter in each pair. Concept / Approach: The approach is to convert each letter to its numeric position and compute second minus first. If three pairs show the same difference and one differs, the differing pair is the odd one out. Here we will look specifically at backward steps from first to second letter. Step-by-Step Solution: CA: C = 3, A = 1, so the difference is 1 minus 3 = -2. FD: F = 6, D = 4, so the difference is 4 minus 6 = -2. KI: K = 11, I = 9, so the difference is 9 minus 11 = -2. TQ: T = 20, Q = 17, so the difference is 17 minus 20 = -3. Thus three pairs follow a constant backward step of -2, but TQ has a backward step of -3. Verification / Alternative check: You can also quickly check by counting letters backward. From C to A, F to D, and K to I, you go back two letters each time. From T to Q, however, you pass R and S and then reach Q, which is three steps back. This visual or mental counting way confirms that TQ does not share the same fixed step as the other pairs. Why Other Options Are Wrong: CA: Second letter is two positions before the first, matching the common rule. FD: Again, D is two letters before F, so it fits the pattern. KI: I lies two positions before K, so it also follows the same backward step. Common Pitfalls: A common mistake is to look only at rough proximity in the alphabet and assume all pairs are similar. Without explicitly counting the steps, the difference between -2 and -3 can go unnoticed. Always calculate or count letter movements carefully when solving alphabet series questions. Final Answer: TQ

Question 7

In the following question, select the odd animal from the given alternatives based on zoological classification.

Accepted Answer

Introduction / Context: This odd man out question from general awareness tests whether you can distinguish between basic animal classes. Competitive exams often ask you to identify which animal does not belong to the same broad zoological group as the others. Given Data / Assumptions: Animals: Crocodile, Rat, Snake, Lizard. Three animals belong to one major class of vertebrates, while one belongs to a different class. Use the usual school level classification into mammals and reptiles. Concept / Approach: Crocodiles, snakes, and lizards are all reptiles. They have scaly skin, usually lay eggs with leathery shells, and are cold blooded. Rats, however, are mammals. They have fur, give birth to live young, and feed their young with milk. Recognizing this class difference yields the odd animal. Step-by-Step Solution: Crocodile: A large reptile, cold blooded, with scaly skin and egg laying reproduction. Snake: Also a reptile, scaly, cold blooded, and commonly egg laying. Lizard: Another reptile with scales and similar physiological traits. Rat: A small mammal, warm blooded, with fur and live birth followed by milk feeding. Thus three options are reptiles, while rat is a mammal and therefore different. Verification / Alternative check: You can also recall that reptiles generally breathe with lungs, have dry scaly skin, and do not nurse their young with milk. Mammals are characterized by hair or fur and mammary glands. Among the given options, only rat clearly fits the mammal description. This reconfirms that rat is the odd one out. Why Other Options Are Wrong: Crocodile: A classic reptile and similar to snake and lizard in basic classification. Snake: Another reptile, sharing the same broad group as crocodile and lizard. Lizard: Also a reptile, and definitely not a mammal like a rat. Common Pitfalls: Sometimes students focus on habitat, such as land or water, rather than on biological class. Because crocodiles can live in water and on land, and rats are usually seen on land, some confusion may arise. However, zoological classification is based on body structure and reproduction, not just habitat, so rat must be selected as the odd one. Final Answer: Rat

Question 8

Four number pairs are given. In each pair, the number on the right is related to the number on the left. Three pairs show the same square rule. Select the odd number pair.

Accepted Answer

Introduction / Context: This is a typical number pair odd man out question where each pair shows a mathematical relationship between the left and right numbers. Your task is to detect the common rule, usually a square or multiple, and then find the pair that does not satisfy it. Given Data / Assumptions: Pairs: 14 - 196, 16 - 256, 12 - 144, 18 - 344. Most pairs follow the same rule; one pair does not. We expect a simple operation like squaring or multiplication. Concept / Approach: When you see pairs like 14 and 196 or 16 and 256, it is natural to check squares because 14^2 and 16^2 are common perfect squares. If three pairs show a right number equal to the left number squared, then any pair breaking this pattern will be the odd one. Step-by-Step Solution: Check 14 - 196: 14^2 = 196, so the right number is the square of the left. Check 16 - 256: 16^2 = 256, again right is left squared. Check 12 - 144: 12^2 = 144, so the same square rule holds. Check 18 - 344: 18^2 = 324, not 344, so this pair does not follow the square rule. Therefore 18 - 344 is the only pair where the right value is not the square of the left value. Verification / Alternative check: You can also confirm by simple subtraction. If the relation is a square, then right minus left squared should be zero. For the first three pairs, 196 - 14^2, 256 - 16^2, and 144 - 12^2 are all zero. For 18 - 344, 344 - 18^2 equals 344 - 324, which is 20, not zero. This confirms that the fourth pair does not satisfy the same rule. Why Other Options Are Wrong: 14 - 196: Obeys the rule right = left^2, so it belongs with the main set. 16 - 256: Also satisfies the same square relationship. 12 - 144: Matches the square rule, so it is not odd. Common Pitfalls: Sometimes candidates may try to force more complex patterns when a simple square rule is enough. Overcomplicating the relation by adding or subtracting constants can create confusion. In exam conditions, always check basic operations such as squares, cubes, and simple multiples before considering more advanced rules. Final Answer: 18 - 344

Question 9

In the following question, select the odd group of letters from the given alternatives based on a constant alphabetical step pattern.

Accepted Answer

Introduction / Context: This question tests your ability to detect consistent jumps in sequences of letters. Many alphabet series questions rely on fixed steps between letters, and one group that breaks the consistency is the odd one out. Given Data / Assumptions: Letter groups: LNPR, KMOQ, FHIK, TVXZ. Use alphabet positions A = 1, B = 2, ..., Z = 26. We compare the jumps between consecutive letters inside each group. Concept / Approach: The strategy is to convert letters to numeric positions and compute the differences between adjacent letters. If three groups show the same constant difference and one group has an inconsistent pattern, that group is the odd one. Step-by-Step Solution: LNPR: L = 12, N = 14, P = 16, R = 18. Differences are +2, +2, +2. KMOQ: K = 11, M = 13, O = 15, Q = 17. Differences are +2, +2, +2. TVXZ: T = 20, V = 22, X = 24, Z = 26. Differences are again +2, +2, +2. FHIK: F = 6, H = 8, I = 9, K = 11. Differences are +2, +1, +2, which is irregular. Thus FHIK alone fails to maintain a constant +2 increment between all letters. Verification / Alternative check: A quick visual way is to write the letters of each group in order and mentally check whether you skip exactly one letter between each pair. In LNPR, KMOQ, and TVXZ, you always skip one letter each time. In FHIK, you skip one letter from F to H, then no letter from H to I, and then one letter from I to K. This mixed skipping confirms that FHIK breaks the pattern. Why Other Options Are Wrong: LNPR: Perfectly follows a constant +2 pattern and matches KMOQ and TVXZ. KMOQ: Also uses a consistent +2 step between every adjacent letter. TVXZ: Again follows the same +2, +2, +2 pattern near the end of the alphabet. Common Pitfalls: Students sometimes check only the first two letters of each group and assume the rest follow the same rule. FHIK starts with a +2 jump, which can mislead a quick observer. Always examine every pair of adjacent letters in the group to avoid missing a hidden irregularity. Final Answer: FHIK

Question 10

Four groups of three numbers are given. In each group, the second and third numbers follow an addition rule from the first. Three groups share the same rule; select the odd group.

Accepted Answer

Introduction / Context: This is another number pattern question where each group of three numbers follows a simple addition rule from the first term. Your goal is to identify the group that does not fit the rule followed by the majority. Given Data / Assumptions: Groups: (9, 11, 14), (13, 15, 18), (17, 19, 22), (21, 23, 28). Second and third numbers are derived from the first number. We look for a pattern like first + constant1 and first + constant2. Concept / Approach: A quick way is to subtract the first number from the second and third numbers in each group and check if the pair of differences is the same for three groups. That repeated pair reveals the rule; the group with a different pair of differences is the odd one out. Step-by-Step Solution: (9, 11, 14): 11 - 9 = 2 and 14 - 9 = 5. (13, 15, 18): 15 - 13 = 2 and 18 - 13 = 5. (17, 19, 22): 19 - 17 = 2 and 22 - 17 = 5. (21, 23, 28): 23 - 21 = 2 but 28 - 21 = 7, not 5. Thus in the first three groups the second and third terms are first + 2 and first + 5, whereas the last group uses first + 2 and first + 7. Verification / Alternative check: You can also directly express the second and third terms as formulas: for the first three groups, second = first + 2 and third = first + 5. When you apply the same rule to 21, you would expect 21, 23, 26, but the actual group is 21, 23, 28. Since 28 does not equal 21 + 5, the pattern breaks here, confirming that the fourth group is different. Why Other Options Are Wrong: (9, 11, 14): Follows the rule first + 2 and first + 5. (13, 15, 18): Also follows exactly the same addition rule. (17, 19, 22): Matches the same pattern of +2 and +5 from the first term. Common Pitfalls: Some candidates may look only at whether the numbers are increasing and ignore the exact size of the jumps. All groups increase, but the size of the second jump is crucial. Ignoring the precise difference can easily make the last group seem normal when it actually breaks the rule followed by the others. Final Answer: (21, 23, 28)

Question 11

Find the odd letter from the following alternatives based on whether it is a vowel or a consonant.

Accepted Answer

Introduction / Context: This very simple odd man out question tests basic knowledge of vowels and consonants in the English alphabet. Such questions appear in elementary reasoning sections to quickly check basic language awareness. Given Data / Assumptions: Letters given: A, U, T, O. We use the standard English vowel set: A, E, I, O, U. We must select the letter that does not belong to the same group as the others. Concept / Approach: The concept is straightforward. First identify which of the letters are vowels and which are consonants. If three letters are vowels and one is a consonant, or vice versa, the minority type is the odd one out. Here, knowing the basic vowel set is enough to solve the problem quickly. Step-by-Step Solution: A is one of the five primary vowels in English. U is also a vowel, used in many common words. O is another vowel, clearly part of the A E I O U set. T, however, is not a vowel. It is a consonant. Thus, three letters are vowels and one is a consonant. The consonant T is the odd letter. Verification / Alternative check: You can quickly check your understanding by listing the vowels A, E, I, O, U and seeing which of the letters appear in that list. A, U, and O are present, while T is not. This quick cross check confirms that T is a consonant and different from the others, which all share the property of being vowels. Why Other Options Are Wrong: A: A core vowel in English and clearly similar to U and O. U: Also a vowel, so it belongs with A and O. O: Another vowel, not distinct from the other vowel options. Common Pitfalls: This is a straightforward question, but sometimes in time pressure students may overthink and search for deeper patterns like position in the alphabet. For very simple problems, the most basic property is often the intended one, and here that property is simply the vowel versus consonant classification. Final Answer: T

Question 12

Find the odd month from the following alternatives based on the number of days in the month.

Accepted Answer

Introduction / Context: This question checks basic calendar knowledge by asking you to identify which month does not have the same number of days as the others. Such questions are common in simple reasoning and general awareness sections. Given Data / Assumptions: Months given: January, April, July, May. You must choose the one month whose total number of days differs from the total days in the other months listed. Use the standard Gregorian calendar where some months have 30 days and some have 31 days. Concept / Approach: The approach is to recall which months have 31 days. From general calendar rules, January, March, May, July, August, October, and December have 31 days, while April, June, September, and November have 30 days. We compare each given month with this rule and detect which month has a different length. Step-by-Step Solution: January has 31 days. July also has 31 days. May has 31 days as well. April has only 30 days, which is different from the other three months listed. Therefore April is the month that does not match the 31 day pattern. Verification / Alternative check: You can verify this quickly by using the well known knuckle mnemonic or the standard list of months with 31 days. If you tap each knuckle and the spaces between them while reciting the months, each knuckle typically represents a 31 day month. Counting January, skipping to May and July, you will see that April falls between such knuckles and corresponds to a 30 day month. Why Other Options Are Wrong: January: A 31 day month and therefore similar to July and May. July: Also has 31 days and matches the pattern of January and May. May: Another 31 day month, so it clearly belongs with January and July. Common Pitfalls: A small number of learners confuse April and May or misremember which months have 30 days. A reliable strategy is to learn the month day pattern once and then periodically revise it. Relying on a vague memory in exam conditions can lead to simple mistakes in otherwise easy questions. Final Answer: April

Question 13

Find the odd number pair from the following alternatives based on whether the second number is 7 more or 7 less than the first.

Accepted Answer

Introduction / Context: This odd one out question tests your ability to spot a constant difference between numbers in pairs. Simple addition or subtraction patterns are very common in reasoning questions, and identifying the one pair that uses a different pattern is the key. Given Data / Assumptions: Pairs: 28 - 21, 31 - 38, 45 - 52, 64 - 71. We examine the relation between the first and second number in each pair. We expect a constant difference, usually plus or minus seven. Concept / Approach: The natural idea is to subtract the first number from the second number in each pair. If three pairs give the same result and one gives a different result or opposite sign, that pair is the odd one out. Here, we compare 21 - 28, 38 - 31, 52 - 45, and 71 - 64. Step-by-Step Solution: For 28 - 21: 21 - 28 = -7, meaning second = first - 7. For 31 - 38: 38 - 31 = 7, so second = first + 7. For 45 - 52: 52 - 45 = 7, so second = first + 7. For 64 - 71: 71 - 64 = 7, again second = first + 7. Three pairs have the pattern first + 7, but one pair has first - 7. Hence 28 - 21 is different. Verification / Alternative check: Instead of subtracting second minus first, you can also look at absolute differences. All pairs have a difference of 7, but the sign of the difference is reversed for one pair. The direction of change is important: in three pairs the number increases by 7, while in one pair it decreases by 7. That decreasing pair is the odd one. Why Other Options Are Wrong: 31 - 38: Here the second value is greater than the first by 7, matching the majority rule. 45 - 52: Again, the second number is first + 7, so it fits the pattern. 64 - 71: Follows the same rule, with the second number 7 more than the first. Common Pitfalls: Some students only check absolute differences and conclude that all pairs are similar because every difference is 7. However, the direction of change from first to second number is crucial here. Overlooking the sign of the difference can cause you to miss the unique decreasing pair and choose the wrong answer. Final Answer: 28 - 21

Question 14

Find the odd animal from the following alternatives based on biological family classification.

Accepted Answer

Introduction / Context: This question checks your general knowledge of animals and their biological families. It requires you to identify which animal does not belong to the same family as the others, a common type of odd one out item in reasoning tests. Given Data / Assumptions: Animals: Wolf, Cat, Dog, Fox. We consider their classification into biological families such as Canidae and Felidae. We assume standard zoological categories used in basic science education. Concept / Approach: Wolves, dogs, and foxes all belong to the dog family, called Canidae. Cats belong to a different group known as the cat family, Felidae. Even though all four animals are carnivorous mammals, the family level classification distinguishes the odd one out. Step-by-Step Solution: Wolf: Belongs to family Canidae and is closely related to dogs and foxes. Dog: Also a member of family Canidae, sharing many physical traits with wolves and foxes. Fox: Another canid, placed in the same family Canidae. Cat: Belongs to family Felidae, the cat family, which includes lions, tigers, and domestic cats. Hence three animals are canids, while cat is a felid, making cat the odd animal. Verification / Alternative check: You can also think in terms of general appearance and common groupings. Wolves, dogs, and foxes all resemble each other more closely in body shape, muzzle length, and behaviour, and are often collectively referred to as dog like animals. Cats have a different body structure, face shape, and movement style, which supports their placement in a separate biological family. Why Other Options Are Wrong: Wolf: A classic wild member of the dog family and similar to dog and fox. Dog: A domesticated canid, but still in the same biological family as wolf and fox. Fox: A small wild canid that fits neatly into family Canidae with wolf and dog. Common Pitfalls: Some candidates may focus on domestic versus wild animals and get confused between dog and cat. However, this classification is based on family level zoology, not domestication. Both dog and cat can be domestic, so that is not the correct basis. Recognising that three animals are in Canidae while cat is in Felidae leads to the correct choice. Final Answer: Cat

Question 15

Find the odd pair of letters from the following alternatives based on the fixed alphabetical gap between the two letters.

Accepted Answer

Introduction / Context: This letter based odd one out question focuses on the fixed gap between two letters of the alphabet. The majority of pairs follow one constant gap, while one pair uses a different gap size, making it the odd pair. Given Data / Assumptions: Letter pairs: BF, LR, MQ, AE. We map letters to positions A = 1, B = 2, ..., Z = 26. We check the difference between second and first letter in each pair. Concept / Approach: We compute the numerical difference between the positions of the second and first letter in each pair. If three pairs show the same difference and one pair shows a different difference, the latter is the odd one. Here, we look for a constant positive gap pattern such as +4 or +6. Step-by-Step Solution: BF: B = 2, F = 6, so the gap is 6 - 2 = 4. MQ: M = 13, Q = 17, gap is 17 - 13 = 4. AE: A = 1, E = 5, gap is 5 - 1 = 4. LR: L = 12, R = 18, gap is 18 - 12 = 6. Thus three pairs have a gap of 4, but LR has a gap of 6 and breaks the pattern. Verification / Alternative check: A quick way to verify is to count letters in between. Between B and F there are C, D, E (three letters) and the total step is four. Between M and Q there are N, O, P. Between A and E there are B, C, D. For L to R, however, you pass M, N, O, P, Q, giving a larger step. This confirms that LR has a different spacing from the others. Why Other Options Are Wrong: BF: Shows the common +4 gap and fits the main pattern. MQ: Also uses a +4 gap and is similar to BF and AE. AE: Again has the same +4 difference between letters. Common Pitfalls: Some exam takers may only check that the second letter appears after the first and overlook the exact number of steps, causing all pairs to look similar. Alphabet questions require precise counting of positions or steps, not just rough direction, to find subtle differences like this one. Final Answer: LR

Question 16

Find the odd number pair from the following alternatives based on whether the second number is exactly twice the first.

Accepted Answer

Introduction / Context: This odd one out question involves simple multiplication relationships inside number pairs. Three pairs follow a rule where the second number is exactly twice the first, while one pair does not, making it the odd pair. Given Data / Assumptions: Pairs: 36 - 72, 17 - 34, 28 - 49, 24 - 48. We look for a pattern where second = 2 * first. All numbers are positive integers, so comparison is easy. Concept / Approach: The approach is straightforward. For each pair, divide the second number by the first or multiply the first by 2, and see whether the equality holds. If three pairs satisfy second = first * 2 and one does not, the one failing the rule is the odd pair. Step-by-Step Solution: 36 - 72: 2 * 36 = 72, so the rule holds. 17 - 34: 2 * 17 = 34, so the rule also holds. 24 - 48: 2 * 24 = 48, again following the doubling rule. 28 - 49: 2 * 28 = 56, not 49, so this pair does not follow the doubling rule. Hence 28 - 49 is the only pair that does not satisfy second = 2 * first. Verification / Alternative check: Another way to verify is to compute the ratio second / first. For 36 - 72, 72 / 36 = 2; for 17 - 34, 34 / 17 = 2; for 24 - 48, 48 / 24 = 2. For 28 - 49, however, 49 / 28 is not an integer and certainly not equal to 2. This confirms that the third pair breaks the simple multiple rule followed by the others. Why Other Options Are Wrong: 36 - 72: Follows the rule second = double of first, so it fits with 17 - 34 and 24 - 48. 17 - 34: Another clean example of the doubling relationship. 24 - 48: Also satisfies the same doubling rule without exception. Common Pitfalls: Some candidates may be distracted by the fact that 49 is a square number (7^2) and try to invent a more complex rule. In many aptitude questions, the intention is to reward quick recognition of simple patterns like doubling rather than complicated number theory. Focusing on the simplest consistent relation usually leads to the correct answer faster. Final Answer: 28 - 49

Question 17

Find the odd word from the following alternatives based on whether the meaning directly describes wealth.

Accepted Answer

Introduction / Context: This vocabulary based odd one out question focuses on synonyms related to wealth. Three words are close in meaning and describe being wealthy, while one word describes social status or respect rather than money. Given Data / Assumptions: Words: Affluent, Rich, Prestigious, Well-to-do. We look at the main meaning of each word in everyday English. We must pick the word that does not directly mean wealthy. Concept / Approach: Affluent, rich, and well-to-do are widely used as synonyms for having a lot of money or financial resources. Prestigious, however, refers to having high status, honour, or respect, which may or may not be linked to wealth. By separating money related words from status related words, we identify the odd one out. Step-by-Step Solution: Affluent: Commonly used to mean financially well off or having plenty of money. Rich: A basic and direct word meaning wealthy or having a lot of money and assets. Well-to-do: Another expression that means comfortably wealthy, financially secure, and prosperous. Prestigious: Means having high reputation, honour, or cultural importance, often used for institutions, awards, or positions. Therefore prestigious is semantically different from the other three, which all focus on wealth. Verification / Alternative check: You can imagine a sentence where each word modifies the same noun, such as family. An affluent family, rich family, or well-to-do family clearly suggests money and comfort. A prestigious family suggests heritage, fame, or social standing, not necessarily money. This contrast confirms that prestigious does not belong in a pure wealth synonym group. Why Other Options Are Wrong: Affluent: Very close in sense to well-to-do and rich, so it is not the odd word. Rich: The most direct synonym for wealthy and clearly part of the main group. Well-to-do: Another expression for being financially comfortable, in line with affluent and rich. Common Pitfalls: Sometimes candidates loosely associate status with wealth and assume prestigious also implies rich. While there can be overlap in real life, the primary dictionary meaning of prestigious is about respect and reputation. Exam questions usually rely on the main dictionary sense, so separating prestige from money is essential for choosing the correct answer. Final Answer: Prestigious

Question 18

Find the odd group of letters from the following alternatives based on the pattern of forward and backward steps in the alphabet.

Accepted Answer

Introduction / Context: This question checks your ability to detect how letters move forward and backward in the alphabet within a three letter group. Three groups follow the same combination of backward and forward steps, while one group follows a different pattern and becomes the odd one. Given Data / Assumptions: Letter groups: OMQ, TPR, TRV, VTX. We use alphabet positions A = 1, B = 2, ..., Z = 26. We focus on the movement from first to second and from second to third letter. Concept / Approach: We convert letters to their numeric positions and compute the difference between first and second letters, and between second and third letters. If three groups follow the same two step pattern such as -2 then +4, and one group uses a different combination like -4 then +2, the different combination marks the odd group. Step-by-Step Solution: OMQ: O = 15, M = 13, Q = 17. Differences are 13 - 15 = -2 and 17 - 13 = +4. TRV: T = 20, R = 18, V = 22. Differences are -2 and +4 again. VTX: V = 22, T = 20, X = 24. Differences are -2 and +4. TPR: T = 20, P = 16, R = 18. Differences are 16 - 20 = -4 and 18 - 16 = +2. Thus three groups share the pattern first to second = -2 and second to third = +4, while TPR has -4 then +2. Verification / Alternative check: Another way to see this is to count letters. From O to M you go back two letters, then forward four to Q. From T to R and V, and from V to T and X, the moves are the same. In TPR, you go back four letters from T to P, then only forward two from P to R, which is obviously a different combination from the other groups. Why Other Options Are Wrong: OMQ: Follows the -2, +4 step pattern and matches TRV and VTX. TRV: Also follows -2, +4, so it clearly belongs to the main group. VTX: Again shows the same -2, +4 pattern and is not odd. Common Pitfalls: Some candidates quickly glance at the letters and assume the patterns are random. Without converting to numbers and checking the exact steps, it is easy to miss subtle differences. Being systematic with alphabet series is crucial: always compute both jumps rather than just noticing that letters move up or down in some way. Final Answer: TPR

Question 19

Find the odd number pair from the following alternatives based on the constant difference between the two numbers.

Accepted Answer

Introduction / Context: This number pair question checks whether you can recognize a constant difference pattern between two numbers. Three pairs share the same difference and one pair has a different difference, making it the odd one out. Given Data / Assumptions: Pairs: 8 - 11, 1 - 4, 7 - 10, 3 - 5. We examine the difference between the second and first number in each pair. We look for a simple constant difference like +3 or +2. Concept / Approach: The concept is straightforward. For each pair, subtract the first number from the second number. If three pairs show the same difference and one pair shows a different difference, the latter pair is the odd one. This is a very common pattern in introductory reasoning questions. Step-by-Step Solution: 8 - 11: 11 - 8 = 3. 1 - 4: 4 - 1 = 3. 7 - 10: 10 - 7 = 3. 3 - 5: 5 - 3 = 2. Thus three pairs have a difference of 3, while one pair has a difference of 2. Verification / Alternative check: You can also think of each pair as a mini arithmetic progression. 8, 11; 1, 4; and 7, 10 all rise by 3. The pair 3, 5 rises only by 2. Since a consistent common difference is often the intended rule in such problems, the pair with a different common difference is the odd one. Why Other Options Are Wrong: 8 - 11: Follows the +3 difference and matches 1 - 4 and 7 - 10. 1 - 4: Another example of the +3 step between numbers. 7 - 10: Also shows the same +3 difference. Common Pitfalls: This question is simple, but under time pressure, students may attempt to find more complex patterns and miss the obvious constant difference. In many exam problems, the simplest arithmetic relation is the intended one, so always check addition and subtraction patterns first. Final Answer: 3 - 5

Question 20

Find the odd shape from the following alternatives: Square, Sphere, Rectangle, Circle.

Accepted Answer

Introduction / Context: This basic geometry based odd man out question tests whether you can distinguish between plane figures and solid figures. It is a very common type in simple reasoning and mathematics awareness sections. Given Data / Assumptions: Shapes listed: Square, Sphere, Rectangle, Circle. Squares, rectangles, and circles are standard two dimensional plane figures. A sphere is a three dimensional solid figure in geometry. Concept / Approach: The key concept is the difference between 2D and 3D figures. Two dimensional shapes have only length and breadth and lie in a plane. Three dimensional figures have length, breadth, and height, and occupy space. By classifying each option as 2D or 3D, the odd shape becomes clear. Step-by-Step Solution: Square: A flat, two dimensional shape with four equal sides and four right angles. Rectangle: Also a two dimensional four sided figure with opposite sides equal and all angles right angles. Circle: A two dimensional figure consisting of all points in a plane at a fixed distance from a center. Sphere: A three dimensional solid, like a perfect ball, with all points in space at a fixed distance from the center. Thus three shapes are 2D plane figures, while one is a 3D solid, making the sphere the odd shape. Verification / Alternative check: Imagine drawing each shape on paper versus making it as a physical object. Square, rectangle, and circle are naturally drawn as flat diagrams. A true sphere, however, cannot be fully represented in a flat drawing; it is realized as a ball like object in three dimensions. This thought experiment confirms that sphere is geometrically different from the other three. Why Other Options Are Wrong: Square: A standard 2D figure and therefore similar to rectangle and circle. Rectangle: Another 2D plane figure, not fundamentally different from a square in terms of dimension. Circle: Also lies entirely in a plane and is clearly not three dimensional like a sphere. Common Pitfalls: Some learners may try to classify shapes based on straight sides versus curved boundaries. Although the circle and sphere have curved boundaries, that is not the focus here. The intended distinction is between 2D and 3D, and from that point of view the sphere is uniquely different and should be chosen as the odd one out. Final Answer: Sphere

Odd Man Out and Series Questions