Reasoning

Classification: Practice Questions with Answers

11 practice questions on Classification, with answers; most also have an explanation or a worked solution. Try each one before you open its answer.

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1. Q.1

   Find the odd one out: CAT, DOG, LION, COW

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   Answer: LION

   Solution:

   1. All four are animals, so the category rule doesn’t separate any of them — look for a structural rule instead.
   2. Letter count: CAT, DOG and COW each have 3 letters. LION has 4 letters, breaking that pattern.

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2. Q.2

   Find the odd one out: Eagle, Sparrow, Parrot, Snake

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   Answer: Snake

   Solution:

   1. Eagle, Sparrow and Parrot are all birds.
   2. Snake is a reptile, not a bird — it doesn’t share the rule the other three follow.

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3. Q.3

   Find the odd one out: Square, Rectangle, Rhombus, Trapezium

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   Answer: Trapezium

   Solution:

   1. A Square, Rectangle and Rhombus are all parallelograms — both pairs of opposite sides are parallel in each.
   2. A Trapezium has only ONE pair of parallel sides, breaking the shared "parallelogram" rule.

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4. Q.4

   Find the odd one out: 24-6, 36-9, 45-9, 16-4

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   Answer: 45-9

   Solution:

   1. Check the relationship within each pair: 24 ÷ 6 = 4, 36 ÷ 9 = 4, 45 ÷ 9 = 5, 16 ÷ 4 = 4.
   2. Three of the four pairs have a 4 : 1 ratio. 45-9 has a 5 : 1 ratio instead, breaking the shared pattern.

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5. Q.5

   Find the odd one out: Mango, Banana, Carrot, Apple

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   Answer: Carrot

   Solution:

   1. Mango, Banana and Apple are all fruits.
   2. Carrot is a vegetable, not a fruit — it doesn’t share the rule the other three follow.

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6. Q.6

   Find the odd one out: 7, 11, 15, 13

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   Answer: 15

   Solution:

   1. 7, 11 and 13 are all prime numbers (divisible only by 1 and themselves).
   2. 15 = 3 × 5 is not prime — it’s composite, breaking the pattern.

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7. Q.7

   Find the odd one out: 8-64, 5-25, 9-81, 6-42

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   Answer: 6-42 (the others pair a number with its square; 6² = 36, not 42)

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8. Q.8

   Find the odd one out: 16, 25, 36, 48

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   Answer: 48 (the others are perfect squares — 4², 5², 6² — 48 is not)

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9. Q.9

   Find the odd one out: DELHI, PARIS, TOKYO, INDIA

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   Answer: INDIA (the others are city names; India is a country)

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10. Q.10

    Find the odd one out: Triangle, Square, Rectangle, Circle

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    Answer: Circle (the others are all polygons with straight sides; a circle has none)

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11. Q.11

    Find the odd one out: 12-144, 9-81, 7-49, 8-72

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    Answer: 8-72 (the others pair a number with its square — 8² = 64, not 72)

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