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RRB JE Practice Questions
Original practice questions for the RRB Junior Engineer Examination (Railway Recruitment Boards (RRB)), mixed across 5 topics with instant answers and explanations. Practise by topic below or take the timed mock test.
RRB JE mixed practice
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Q1.PhysicsThe SI unit of force is the:
Show answer & explanation
Answer: A — Newton
1 newton = 1 kg·m/s².
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Q2.ChemistryAvogadro’s number is approximately:
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Answer: A — 6.022 × 10²³
One mole contains 6.022 × 10²³ particles.
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Q3.Number System & SimplificationWhat is √4,096?
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Answer: A — 64
64 × 64 = 4096, so √4096 = 64.
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Q4.Logical ReasoningFind the next letter: H, K, N, Q, ?
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Answer: C — T
The letters advance by 3 each time (skip 2).
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Q5.Computer AwarenessA firewall is used to:
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Answer: C — Monitor and control network traffic for security
Firewalls filter incoming and outgoing traffic.
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Q6.PhysicsA body starts at 20 m/s and accelerates uniformly at 5 m/s² for 10 s. Find its final velocity.
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Answer: A — 70 m/s
v = u + at = 20 + 5×10 = 70 m/s.
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Q7.ChemistryWhat is the mass of 0.5 mol of water (H₂O)? (Molar mass 18 g/mol)
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Answer: A — 9 g
Mass = moles × molar mass = 0.5 × 18 g/mol = 9 g.
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Q8.Number System & SimplificationFind the next number in the series: 2, 6, 18, 54, 162, ?
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Answer: C — 486
Each term is multiplied by 3.
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Q9.Logical ReasoningFind the next letter: H, J, L, N, ?
Show answer & explanation
Answer: C — P
The letters advance by 2 each time (skip 1).
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Q10.Computer AwarenessWhich device connects different networks and routes data between them?
Show answer & explanation
Answer: B — Router
A router forwards packets between networks.
About RRB JE
RRB Junior Engineer Examination — conducted by Railway Recruitment Boards (RRB). Recruits Junior Engineers, Depot Material Superintendents and Chemical & Metallurgical Assistants.
Original practice questions written for this site in the style and difficulty of each exam’s syllabus. They are not past papers and the site is not affiliated with any exam body. Exam patterns, marking schemes and syllabi change — always check the latest official notification.
Practise by topic
- Physics questions — Write the formula before substituting and keep SI units throughout.
- Chemistry questions — Moles = mass ÷ molar mass; molarity = moles ÷ litres.
- Number System & Simplification questions — Learn squares to 30 and cubes to 15, apply BODMAS strictly, and use HCF × LCM = product of two numbers.
- Logical Reasoning questions — For coding questions write the letter positions (A = 1 … Z = 26).
- Computer Awareness questions — Revise hardware vs software, memory types, number systems, common shortcuts, networking devices and internet protocols.
- RRB JE mock test — 25 timed questions with negative marking.
RRB JE practice topics
| Topic | Section | Question source |
|---|---|---|
| Physics | Science | Calculated + question bank |
| Chemistry | Science | Calculated + question bank |
| Number System & Simplification | Quantitative aptitude | Calculated (new numbers every set) |
| Logical Reasoning | Reasoning | Calculated (new numbers every set) |
| Computer Awareness | Computer knowledge | Question bank |