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RRB Group D Mock Test
A timed 25-question mock for the RRB Level 1 (Group D) Examination covering number system & simplification, percentages, logical reasoning, physics, chemistry, biology, indian polity, history & geography. Answer, submit and review every question with its explanation; set negative marking to match your exam’s current scheme.
RRB Group D 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.Number System & SimplificationSimplify: 94 + 9 × 8 − 49
Answer: C — 117
BODMAS: multiply first — 9 × 8 = 72; then 94 + 72 − 49 = 117.
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Q2.PercentagesTwo successive discounts of 10% and 15% are equivalent to a single discount of:
Answer: D — 23.5%
Net discount = a + b − ab/100 = 10 + 15 − 10×15/100 = 23.5%.
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Q3.Logical ReasoningIf CODE is coded as GSHI, how is CAT coded?
Answer: D — GEX
Each letter moves 4 places forward in the alphabet (CODE → GSHI), so CAT → GEX.
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Q4.PhysicsWhich mirror is used as a rear-view mirror in vehicles?
Answer: C — Convex
Convex mirrors give an erect, diminished image and a wide field of view.
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Q5.ChemistryWhich gas is responsible for most of the greenhouse effect from human activity?
Answer: C — Carbon dioxide
CO₂ from burning fossil fuels is the largest human-caused contributor.
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Q6.BiologyBile is produced by the:
Answer: B — Liver
Bile is made in the liver and stored in the gall bladder.
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Q7.Indian Polity, History & GeographyWhich Article empowers the President to declare a National Emergency?
Answer: C — Article 352
Article 352 — National Emergency; 356 — President’s Rule; 360 — Financial Emergency.
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Q8.Number System & SimplificationSimplify: 41 + 5 × 7 − 23
Answer: B — 53
BODMAS: multiply first — 5 × 7 = 35; then 41 + 35 − 23 = 53.
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Q9.PercentagesWhat is 25% of 840?
Answer: B — 210
25% of 840 = 25/100 × 840 = 210.
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Q10.Logical ReasoningWhich number is the odd one out: 19, 35, 39, 51?
Answer: D — 19
39, 51, 35 are composite; 19 is prime.
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Q11.PhysicsA body starts at 7 m/s and accelerates uniformly at 1 m/s² for 4 s. Find its final velocity.
Answer: D — 11 m/s
v = u + at = 7 + 1×4 = 11 m/s.
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Q12.ChemistryWhat is the mass of 0.5 mol of carbon dioxide (CO₂)? (Molar mass 44 g/mol)
Answer: C — 22 g
Mass = moles × molar mass = 0.5 × 44 g/mol = 22 g.
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Q13.BiologyMalaria is caused by:
Answer: A — Plasmodium (a protozoan)
Plasmodium parasites are spread by female Anopheles mosquitoes.
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Q14.Indian Polity, History & GeographyBlack soil (regur) is most suitable for growing:
Answer: D — Cotton
Moisture-retentive black soil of the Deccan is ideal for cotton.
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Q15.Number System & SimplificationWhat is √2,209?
Answer: A — 47
47 × 47 = 2209, so √2209 = 47.
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Q16.PercentagesTwo successive discounts of 25% and 10% are equivalent to a single discount of:
Answer: B — 32.5%
Net discount = a + b − ab/100 = 25 + 10 − 25×10/100 = 32.5%.
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Q17.Logical ReasoningWhat is the angle between the hour and minute hands of a clock at 2:00?
Answer: D — 60°
Angle = |30H − 5.5M| = |30×2 − 5.5×0| = 60°.
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Q18.PhysicsWhich law states that every action has an equal and opposite reaction?
Answer: D — Newton’s third law
Newton’s third law.
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Q19.ChemistryA solution with pH 3 is:
Answer: B — Acidic
pH below 7 is acidic.
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Q20.BiologyThe powerhouse of the cell is the:
Answer: B — Mitochondrion
Mitochondria produce ATP through cellular respiration.
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Q21.Indian Polity, History & GeographyWho is the ex-officio Chairman of the Rajya Sabha?
Answer: C — Vice-President
The Vice-President is the ex-officio Chairman of the Rajya Sabha (Article 64).
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Q22.Number System & SimplificationFind the next number in the series: 4, 9, 16, 25, 36, ?
Answer: D — 49
Squares of consecutive numbers: 2², 3², … → 7² = 49.
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Q23.PercentagesTwo successive discounts of 30% and 20% are equivalent to a single discount of:
Answer: D — 44%
Net discount = a + b − ab/100 = 30 + 20 − 30×20/100 = 44%.
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Q24.Logical ReasoningWhich number is the odd one out: 19, 29, 43, 65?
Answer: A — 65
29, 43, 19 are prime; 65 is composite (65 = 5 × 13).
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Q25.PhysicsFind the power dissipated when 3 A flows through a 10 Ω resistor.
Answer: B — 90 W
P = I²R = 3² × 10 = 90 W.
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 Group D
RRB Level 1 (Group D) Examination — conducted by Railway Recruitment Boards (RRB). Recruits track maintainers, helpers and assistants; general science carries significant weight.
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 Group D practice topics
| Topic | Section | Question source |
|---|---|---|
| Number System & Simplification | Quantitative aptitude | Calculated (new numbers every set) |
| Percentages | Quantitative aptitude | Calculated (new numbers every set) |
| Logical Reasoning | Reasoning | Calculated (new numbers every set) |
| Physics | Science | Calculated + question bank |
| Chemistry | Science | Calculated + question bank |
| Biology | Science | Question bank |
| Indian Polity, History & Geography | General awareness | Question bank |