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RRB JE Mock Test
A timed 25-question mock for the RRB Junior Engineer Examination covering physics, chemistry, number system & simplification, logical reasoning, computer awareness. Answer, submit and review every question with its explanation; set negative marking to match your exam’s current scheme.
RRB JE mock test
25 questions · 1 mark each · the timer starts with your first answer and the test submits itself when time runs out.
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Q1.PhysicsWhich colour of visible light has the longest wavelength?
Answer: A — Red
Red light has the longest wavelength (~700 nm).
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Q2.ChemistryWhich gas is produced when zinc reacts with dilute hydrochloric acid?
Answer: B — Hydrogen
Zn + 2HCl → ZnCl₂ + H₂.
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Q3.Number System & SimplificationWhat is √900?
Answer: D — 30
30 × 30 = 900, so √900 = 30.
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Q4.Logical ReasoningWhich number is the odd one out: 33, 39, 47, 57?
Answer: D — 47
39, 33, 57 are composite; 47 is prime.
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Q5.Computer AwarenessThe brain of the computer is the:
Answer: A — CPU
The Central Processing Unit executes instructions.
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Q6.PhysicsA current of 4 A flows through a 10 Ω resistor. What is the potential difference across it?
Answer: B — 40 V
Ohm’s law: V = IR = 4 × 10 = 40 V.
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Q7.ChemistryWhat is the pH of a solution with [OH⁻] = 10⁻⁴ mol/L at 25 °C?
Answer: A — 10
[OH⁻] = 10⁻⁴ → pOH = 4; pH = 14 − 4 = 10 (at 25 °C).
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Q8.Number System & SimplificationSimplify: 22 + 3 × 8 − 46
Answer: B — 0
BODMAS: multiply first — 3 × 8 = 24; then 22 + 24 − 46 = 0.
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Q9.Logical ReasoningFind the next letter: I, M, Q, U, ?
Answer: D — Y
The letters advance by 4 each time (skip 3).
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Q10.Computer AwarenessCache memory is located:
Answer: D — Between the CPU and main memory
Cache is fast memory close to the CPU that stores frequently used data.
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Q11.PhysicsWhich law states that every action has an equal and opposite reaction?
Answer: A — Newton’s third law
Newton’s third law.
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Q12.ChemistryIsotopes of an element have the same number of:
Answer: D — Protons
Isotopes share the proton number but differ in neutrons.
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Q13.Number System & SimplificationFind the next number in the series: 4, 8, 16, 32, 64, ?
Answer: D — 128
Each term is multiplied by 2.
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Q14.Logical ReasoningRavi walks 7 m north, turns right and walks 10 m, then turns right again and walks 3 m. How far is he from the start?
Answer: A — 10.77 m
Net: 4 m north and 10 m east. Distance = √(4² + 10²) = 10.77 m.
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Q15.Computer AwarenessWhat is the extension of a Microsoft Excel workbook (2007+)?
Answer: C — .xlsx
.xlsx is the default Excel workbook format.
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Q16.PhysicsWhat force is needed to accelerate a 12 kg mass at 3 m/s²?
Answer: C — 36 N
F = ma = 12 × 3 = 36 N.
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Q17.ChemistryWhat is the mass of 4 mol of water (H₂O)? (Molar mass 18 g/mol)
Answer: B — 72 g
Mass = moles × molar mass = 4 × 18 g/mol = 72 g.
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Q18.Number System & SimplificationWhat is √7,225?
Answer: B — 85
85 × 85 = 7225, so √7225 = 85.
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Q19.Logical ReasoningIf CAT is coded as DBU, how is FISH coded?
Answer: B — GJTI
Each letter moves 1 place forward in the alphabet (CAT → DBU), so FISH → GJTI.
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Q20.Computer AwarenessWhich protocol is used to send email?
Answer: D — SMTP
SMTP (Simple Mail Transfer Protocol) sends email.
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Q21.PhysicsSound cannot travel through:
Answer: D — Vacuum
Sound needs a medium; it cannot travel through a vacuum.
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Q22.ChemistryThe periodic table is arranged in order of increasing:
Answer: B — Atomic number
The modern periodic table orders elements by atomic number.
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Q23.Number System & SimplificationFind the next number in the series: 4, 12, 36, 108, 324, ?
Answer: B — 972
Each term is multiplied by 3.
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Q24.Logical ReasoningFind the next letter: D, H, L, P, ?
Answer: B — T
The letters advance by 4 each time (skip 3).
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Q25.Computer AwarenessWhich shortcut copies selected text in most applications?
Answer: A — Ctrl + C
Ctrl + C copies; Ctrl + V pastes; Ctrl + X cuts; Ctrl + Z undoes.
How the mock test works
- The timer starts with your first answer; the test submits itself when time runs out.
- Choose the negative marking that matches your exam (many Indian exams deduct ¼ or ⅓ of a mark — check the official notification).
- After submitting you get your score, accuracy, time taken and a topic-wise breakdown, then every explanation.
- “New mock test” builds another paper — calculation questions get new numbers.
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 |