Preparing for the RRB NTPC exam? You already know that the competition is tough. To secure a seat in the Indian Railways, you need to grab every single mark you can. In the General Intelligence and Reasoning section, there is one topic that looks very easy but requires a lot of practice, which is classification. It is also known as “Odd One Out.” You might think, “Picking the odd one out is so simple, why do I need to study it?” Here is the reality: RRB NTPC asks tricky questions where the logic isn’t always obvious. Sometimes it’s based on Science, sometimes on Squares/Cubes, and sometimes on General Knowledge. If you practice the right logic, this topic can give you 2-3 marks in seconds. In this blog, we have provided a free PDF of classification questions for RRB NTPC.
What is Classification? Why is it Important?
In simple words, Classification means “Finding the Stranger.” The examiner gives you four options. Three of them share a common quality or follow the same rule, but one does not. Your job is to find that “Odd One Out.”
Why focus on this topic?
- It’s a Time Saver: You don’t need to calculate long formulas. You either know the logic, or you don’t.
- High Frequency: You will find at least 2 to 3 questions in every shift of CBT-1 and CBT-2.
- No Rough Work: Most of these questions can be solved just by looking at the screen.
Important Types of Classification Questions
The logic can come from anywhere. Here are the three main types you must prepare:
| Type | Example Logic |
| Word Classification | Based on GK (Capitals, Animals, Science). Ex: Apple, Mango, Potato, Banana. (Ans: Potato – it’s a vegetable) |
| Number Classification | Based on Math (Squares, Cubes, Prime Numbers). Ex: 4, 9, 16, 20. (Ans: 20 – others are squares) |
| Letter Classification | Based on Alphabet positions. Ex: AZ, BY, CX, DV. (Ans: DV – others are opposite pairs) |
Download Free PDF of Classification Questions for RRB NTPC
Railway mostly repeats its questions in the exam. We have analyzed the last 5 years of RRB NTPC question papers and selected the questions that get repeated the most. We have compiled a PDF with those questions and provided some questions directly in this blog. These questions will help you know the pattern of the questions, the difficulty level of the questions, and much more. So, you are strongly advised to download the PDF for free and start solving the exam-level questions.
Q1. Find the odd word from the given alternatives.
(a) Kidney
(b) Heart
(c) Lung
(d) Ear
Answer: (b) Heart
(Logic: Kidneys, Lungs, and Ears exist in pairs in the human body. The Heart is single.)
Q2. Choose the number pair which is different from the others.
(a) 8 – 27
(b) 64 – 125
(c) 216 – 343
(d) 49 – 81
Answer: (d) 49 – 81
(Logic: In all other options, the numbers are perfect cubes (2^3-3^3, 4^3-5^3). In (d), they are squares (7^2-9^2)
Q3. Select the odd letters from the given alternatives.
(a) ACE
(b) GIK
(c) MOQ
(d) WYZ
Answer: (d) WYZ
(Logic: +2 gap pattern. A(+2)C(+2)E. W(+2)Y(+1)Z. So, WYZ is the odd one.)
Q4. Find the odd word.
(a) Rupee
(b) Yen
(c) Dollar
(d) Currency
Answer: (d) Currency
(Logic: Rupee, Yen, and Dollar are specific names of currencies. “Currency” is the general term.)
Q5. Choose the odd number.
(a) 29
(b) 31
(c) 39
(d) 41
Answer: (c) 39
(Logic: 29, 31, and 41 are Prime Numbers. 39 is a composite number (divisible by 3 and 13).)
Q6. Find the odd one out.
(a) Car : Road
(b) Ship : Sea
(c) Rocket : Space
(d) Aeroplane : Pilot
Answer: (d) Aeroplane : Pilot
(Logic: The relationship is Vehicle : Medium of Travel. A car travels on road, ship in sea, rocket in space. But for Aeroplane, ‘Pilot’ is the driver, not the medium.)
Q7. Select the odd letters.
(a) DW
(b) GT
(c) KP
(d) MN
(e) JR
Answer: (e) JR
(Logic: All others are Opposite Letter pairs (A-Z, B-Y…). J is opposite to Q, not R.)
Q8. Find the odd word.
(a) Square
(b) Circle
(c) Rectangle
(d) Triangle
Answer: (b) Circle
(Logic: Square, Rectangle, and Triangle are made of straight lines. A Circle is made of a curved line.)
Q9. Choose the odd number group.
(a) 12, 24, 48
(b) 5, 10, 20
(c) 8, 16, 32
(d) 6, 14, 30
Answer: (d) 6, 14, 30
(Logic: In other options, the pattern is x 2, x 2. Example: 12 x 2=24, 24 x 2=48. This fails in option d.)
Q10. Find the odd word.
(a) Veena
(b) Guitar
(c) Flute
(d) Violin
Answer: (c) Flute
(Logic: Veena, Guitar, and Violin are string instruments. A flute is a wind instrument.)
How to Prepare Classification for RRB NTPC?
You might feel this topic is too random. But with a smart approach, you can master it. Here are some simple tips:
- Brush Up Your GK: As you saw in the examples, many questions are based on Science (Organs), Geography (Currencies), or Music. If you study General Awareness well, your Reasoning score automatically improves.
- Learn Squares & Primes: For Number Classification, always check for Prime Numbers first. Then check for Squares and Cubes. 90% of the number questions are based on these two logics.
- Memorize Alphabet Opposites: Write down A-Z and Z-A. Recognizing pairs like ‘G-T’ (G.T. Road) or ‘H-S’ (High School) instantly helps you spot the odd one out in letter questions.
- Don’t Overthink: Classification questions usually have a simple logic. If you are thinking too deeply or using complex formulas, you are probably on the wrong track. Look for the most obvious difference.
- Practice with Our Topic Tests: Reading is passive; solving is active. Attempt 15-20 questions daily using our Free Topic Tests. It helps your brain recognize patterns faster.
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FAQs: Classification Questions for RRB NTPC
It is another name for Classification questions. You are given a group of items, and you have to identify the one that is different from the rest based on a specific property.
Yes! In Word Classification, the logic is often based on General Knowledge, like capitals, currencies, biology, or scientific units.
You can expect 2 to 3 questions from this topic in the General Intelligence and Reasoning section.
You can download the exam-level Classification PDF by clicking the link provided in the middle of this blog post. It contains the most repeated questions for practice.
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