Classification
Find the odd one out among words, numbers, number-pairs and letter-clusters in the RRB NTPC CBT 1 pattern: 6 bilingual sets from easy to hard.
Topics Covered in Classification
Classification Practice Tests
Classification Practice Set 01
Classification Practice Set 02
Classification Practice Set 03
Classification Practice Set 04
Classification Practice Set 05
Classification Practice Set 06
Smart Practice Path
Start with Easy, move to Medium, and challenge yourself with Hard test results.
Why Practice Classification?
- Classification is part of the General Intelligence & Reasoning syllabus of CBT 1
- Builds the habit of naming what three options share before choosing
- Number and letter questions train quick checks for primes, squares, cubes and letter gaps
- Each set is 15 questions in 12 minutes with 1/3 negative marking
Concepts You Will Master
- Word groups: categories such as fruits, metals, planets, hormones, national parks
- Number properties: prime, perfect square, perfect cube, n² ± 1, n³ − 1, n(n + 1), multiples
- Number-pair rules: square, cube, n(n + 1), n² + k, n³ ± k
- Letter-cluster gaps and opposite-letter pairs (A–Z, B–Y …)
Preparation Tip
Before marking an answer, say in one line what the other three share (for example, "all are prime"). If two options seem odd, look for a stronger common property in the remaining three. Keep a list of squares up to 30² and cubes up to 15³.
Explore Other Reasoning Topics
About Classification
Classification (odd one out) questions give four items, three of which share a property. These six sets cover word groups, number properties, number-pair rules and letter-cluster patterns. Every question has an explanation in English, Hindi and Hinglish, and every option says why it belongs to the group or not.
FAQs
There are 6 sets: 2 easy, 2 medium and 2 hard. Each set has 15 questions and a 12-minute timer.
Each correct answer gives 1 mark and each wrong answer deducts 1/3 mark, the same as RRB NTPC CBT 1.
Yes. Every question can be attempted in English or Hindi, and solutions are given in English, Hindi and Hinglish.
Check in this order: prime, perfect square, perfect cube, one more or one less than a square or cube, product of two consecutive numbers, and common multiples.
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