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RRB JE Physics Questions
Practise physics (science) for the RRB Junior Engineer Examination: 10 multiple-choice questions, each with the correct answer and a worked explanation. Click an option to check it, or “New questions” for another set.
Physics practice
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Q1.The device that converts mechanical energy into electrical energy is a:
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Answer: B — Generator
A generator uses electromagnetic induction.
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Q2.Find the power dissipated when 4 A flows through a 8 Ω resistor.
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Answer: C — 128 W
P = I²R = 4² × 8 = 128 W.
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Q3.Which mirror is used as a rear-view mirror in vehicles?
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Answer: A — Convex
Convex mirrors give an erect, diminished image and a wide field of view.
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Q4.A body with initial velocity 4 m/s accelerates at 2 m/s² for 2 s. Find the distance covered.
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Answer: D — 12 m
s = ut + ½at² = 4×2 + ½×2×2² = 12 m.
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Q5.The bending of light as it passes from one medium to another is:
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Answer: A — Refraction
Refraction is caused by a change in light’s speed.
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Q6.A body starts at 10 m/s and accelerates uniformly at 3 m/s² for 6 s. Find its final velocity.
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Answer: A — 28 m/s
v = u + at = 10 + 3×6 = 28 m/s.
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Q7.Which colour of visible light has the longest wavelength?
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Answer: A — Red
Red light has the longest wavelength (~700 nm).
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Q8.Find the power dissipated when 2.5 A flows through a 12 Ω resistor.
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Answer: C — 75 W
P = I²R = 2.5² × 12 = 75 W.
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Q9.The speed of light in vacuum is approximately:
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Answer: C — 3 × 10⁸ m/s
c ≈ 2.998 × 10⁸ m/s.
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Q10.A current of 1.5 A flows through a 4 Ω resistor. What is the potential difference across it?
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Answer: B — 6 V
Ohm’s law: V = IR = 1.5 × 4 = 6 V.
How to approach physics questions
Write the formula before substituting and keep SI units throughout. Most numerical questions use one of: v = u + at, s = ut + ½at², F = ma, KE = ½mv², V = IR, P = I²R.
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.
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 |