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RRB NTPC 2026 General Science Special Quiz
High priority physics and chemistry questions for upcoming RRB NTPC Railway recruitment exam.
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Question #1
Medium
What is the SI unit of electric current?
Correct Answer: Option D
Explanation: Electric current is measured in amperes.
Memory Trick: Current → Ampere.
Exam Tip: Units are frequent one-liners.
Question #2
Medium
Which instrument measures electric current in a circuit?
Correct Answer: Option B
Explanation: An ammeter measures current.
Memory Trick: Ammeter = Ampere.
Exam Tip: Know instrument-function pairs.
Question #3
Medium
A train covers 150 m in 10 s. Its speed is:
Correct Answer: Option C
Explanation: Speed = 150/10 = 15 m/s.
Memory Trick: Distance ÷ Time.
Exam Tip: Watch unit conversions.
Question #4
Medium
A bus starts suddenly and a passenger falls backward due to:
Correct Answer: Option B
Explanation: The body tends to remain at rest.
Memory Trick: Start → Back.
Exam Tip: Newton's First Law is common.
Question #5
Medium
Force needed to accelerate a 5 kg body at 3 m/s² is:
Correct Answer: Option C
Explanation: F = ma = 15 N.
Memory Trick: F = ma.
Exam Tip: Use SI units.
Question #6
Medium
Heat reaches Earth from the Sun mainly by:
Correct Answer: Option C
Explanation: Space is a vacuum, so radiation transfers heat.
Memory Trick: Sun → Radiation.
Exam Tip: Classic railway question.
Question #7
Medium
Speed of sound in air is approximately:
Correct Answer: Option B
Explanation: Around 332 m/s at 0°C.
Memory Trick: Sound ≈ 330.
Exam Tip: Don't confuse with light.
Question #8
Medium
The speed of light in vacuum is:
Correct Answer: Option C
Explanation: Approximately 3×10⁸ m/s.
Memory Trick: Light → 3×10⁸.
Exam Tip: Scientific notation matters.
Question #9
Medium
Which mirror is used in vehicle rear-view mirrors?
Correct Answer: Option B
Explanation: Convex mirrors provide a wider field of view.
Memory Trick: Vehicles → Convex.
Exam Tip: Daily-life applications repeat often.
Question #10
Medium
VIBGYOR represents:
Correct Answer: Option B
Explanation: It is the order of rainbow colours.
Memory Trick: VIBGYOR = Rainbow.
Exam Tip: Sequence-based questions appear.
Question #11
Medium
Which gas is most abundant in Earth's atmosphere?
Correct Answer: Option C
Explanation: Nitrogen makes up about 78%.
Memory Trick: N₂ = 78%.
Exam Tip: Memorize major percentages.
Question #12
Medium
Water is H₂O according to which law?
Correct Answer: Option B
Explanation: Water always contains hydrogen and oxygen in a fixed mass ratio.
Memory Trick: Fixed ratio.
Exam Tip: Chemistry laws are direct asks.
Question #13
Medium
Mendeleev left gaps in the periodic table for:
Correct Answer: Option B
Explanation: He predicted future elements.
Memory Trick: Gaps = Future.
Exam Tip: Historical chemistry questions are frequent.
Question #14
Medium
Which is an alkali?
Correct Answer: Option B
Explanation: Sodium hydroxide is a strong alkali.
Memory Trick: NaOH = Base.
Exam Tip: Acid-base formulas are easy marks.
Question #15
Medium
The pH of a neutral solution is:
Correct Answer: Option C
Explanation: Neutral solutions have pH 7.
Memory Trick: 7 = Neutral.
Exam Tip: pH scale basics are high-yield.
Question #16
Medium
Which acid is present in vinegar?
Correct Answer: Option B
Explanation: Vinegar contains acetic acid.
Memory Trick: Vinegar → Acetic.
Exam Tip: Common substances are asked.
Question #17
Medium
Which gas is released when zinc reacts with dilute HCl?
Correct Answer: Option B
Explanation: Metal + Acid → Salt + Hydrogen.
Memory Trick: Metal + Acid = H₂.
Exam Tip: Reaction patterns matter.
Question #18
Medium
Rusting mainly requires:
Correct Answer: Option C
Explanation: Rusting is oxidation in the presence of water.
Memory Trick: O₂ + H₂O.
Exam Tip: Everyday science is common.
Question #19
Medium
The chemical formula of baking soda is:
Correct Answer: Option B
Explanation: Baking soda is sodium bicarbonate.
Memory Trick: Baking → HCO₃.
Exam Tip: Differentiate washing vs baking soda.
Question #20
Medium
Which gas turns limewater milky?
Correct Answer: Option C
Explanation: CO₂ forms calcium carbonate.
Memory Trick: CO₂ = Milky.
Exam Tip: Standard lab test.
Question #21
Medium
Powerhouse of the cell is:
Correct Answer: Option C
Explanation: ATP is produced in mitochondria.
Memory Trick: Mito = Power.
Exam Tip: Biology favourites never disappear.
Question #22
Medium
The largest gland in the human body is:
Correct Answer: Option C
Explanation: The liver is the largest gland.
Memory Trick: Largest gland = Liver.
Exam Tip: Body-organ facts repeat.
Question #23
Medium
Which vitamin is produced in sunlight?
Correct Answer: Option D
Explanation: Skin synthesizes Vitamin D in sunlight.
Memory Trick: Sun = D.
Exam Tip: Deficiency questions are common.
Question #24
Medium
The blood group universal donor is:
Correct Answer: Option C
Explanation: O-negative can donate to all blood groups.
Memory Trick: O− gives all.
Exam Tip: Remember donor and recipient separately.
Question #25
Medium
The universal recipient blood group is:
Correct Answer: Option B
Explanation: AB-positive can receive from all groups.
Memory Trick: AB+ receives all.
Exam Tip: Frequently paired with universal donor.
Question #26
Medium
Which organ filters blood in the human body?
Correct Answer: Option B
Explanation: Kidneys filter blood and produce urine.
Memory Trick: Filter = Kidney.
Exam Tip: Basic physiology is high-frequency.
Question #27
Medium
Insulin is produced by the:
Correct Answer: Option B
Explanation: Pancreatic beta cells secrete insulin.
Memory Trick: Pancreas → Insulin.
Exam Tip: Endocrine glands are important.
Question #28
Medium
The functional unit of the kidney is:
Correct Answer: Option B
Explanation: Nephrons perform filtration.
Memory Trick: Kidney = Nephron.
Exam Tip: Know organ-function units.
Question #29
Medium
Photosynthesis mainly occurs in which cell organelle?
Correct Answer: Option B
Explanation: Chlorophyll in chloroplast captures light.
Memory Trick: Green = Chloroplast.
Exam Tip: Plant cell questions are common.
Question #30
Medium
Which disease is caused by deficiency of Vitamin C?
Correct Answer: Option B
Explanation: Vitamin C deficiency causes scurvy.
Memory Trick: C = Citrus = Scurvy.
Exam Tip: Vitamin-disease pairs are easy marks.
Question #31
Medium
Which planet is known as the Red Planet?
Correct Answer: Option C
Explanation: Iron oxide gives Mars its red appearance.
Memory Trick: Red = Mars.
Exam Tip: Space GK overlaps with science.
Question #32
Medium
Largest planet in the solar system is:
Correct Answer: Option B
Explanation: Jupiter is the largest planet.
Memory Trick: Jumbo Jupiter.
Exam Tip: Common one-liner.
Question #33
Medium
Smallest planet in the solar system is:
Correct Answer: Option A
Explanation: Mercury is the smallest planet.
Memory Trick: Mini Mercury.
Exam Tip: Don't confuse with Pluto.
Question #34
Medium
Which planet has the maximum known natural satellites?
Correct Answer: Option B
Explanation: Saturn currently has the highest confirmed number.
Memory Trick: Saturn = Satellite king.
Exam Tip: Updated fact appears in recent exams.
Question #35
Medium
Which gas is essential for photosynthesis?
Correct Answer: Option B
Explanation: Plants use CO₂ to make food.
Memory Trick: CO₂ in, O₂ out.
Exam Tip: Life-process basics matter.
Question #36
Medium
Which metal is liquid at room temperature?
Correct Answer: Option C
Explanation: Mercury remains liquid at room temperature.
Memory Trick: Mercury melts already.
Exam Tip: Classic chemistry fact.
Question #37
Medium
The hardest natural substance is:
Correct Answer: Option B
Explanation: Diamond ranks highest on Mohs scale.
Memory Trick: Diamond = Hardest.
Exam Tip: Natural vs artificial wording matters.
Question #38
Medium
Which metal is extracted from bauxite?
Correct Answer: Option C
Explanation: Bauxite is the chief ore of aluminium.
Memory Trick: Bauxite → Aluminium.
Exam Tip: Ore-metal pairs are common.
Question #39
Medium
Which gas is called laughing gas?
Correct Answer: Option B
Explanation: Nitrous oxide (N₂O) is laughing gas.
Memory Trick: N₂O = Smile.
Exam Tip: Chemical names are tested.
Question #40
Medium
The process of converting sugar into alcohol is:
Correct Answer: Option C
Explanation: Yeast converts sugar into alcohol.
Memory Trick: Yeast = Fermentation.
Exam Tip: Industrial processes appear often.
Question #41
Medium
Frequency and time period are related by:
Correct Answer: Option B
Explanation: They are reciprocals.
Memory Trick: Flip T.
Exam Tip: Formula recall is enough.
Question #42
Medium
Which principle states every point on a wavefront acts as a source of secondary wavelets?
Correct Answer: Option B
Explanation: Huygens explained wave propagation.
Memory Trick: Huygens = Wavelets.
Exam Tip: Optics theory is common.
Question #43
Medium
Which blood component helps in clotting?
Correct Answer: Option C
Explanation: Platelets initiate blood clotting.
Memory Trick: Platelets = Plug.
Exam Tip: Blood components are repeatedly asked.
Question #44
Medium
Which chamber of the heart pumps oxygenated blood to the body?
Correct Answer: Option D
Explanation: The left ventricle pumps blood through the aorta.
Memory Trick: Left = Launch.
Exam Tip: Heart-flow diagrams help.
Question #45
Medium
Which tissue connects muscle to bone?
Correct Answer: Option C
Explanation: Tendons connect muscles to bones.
Memory Trick: Tendon = To muscle.
Exam Tip: Ligament vs tendon is a favourite.
Question #46
Medium
Which tissue connects bone to bone?
Correct Answer: Option B
Explanation: Ligaments join bones together.
Memory Trick: Ligament = Link bones.
Exam Tip: Compare with tendons.
Question #47
Medium
Which disease is caused by deficiency of iodine?
Correct Answer: Option B
Explanation: Iodine deficiency enlarges the thyroid gland.
Memory Trick: Iodine = Thyroid.
Exam Tip: Nutrition questions are common.
Question #48
Medium
Which gas is used by plants during respiration?
Correct Answer: Option C
Explanation: Plants respire using oxygen like animals.
Memory Trick: Respiration = O₂.
Exam Tip: Don't confuse with photosynthesis.
Question #49
Medium
The ozone layer mainly protects Earth from:
Correct Answer: Option C
Explanation: Ozone absorbs harmful UV radiation.
Memory Trick: Ozone = UV shield.
Exam Tip: Environment-science crossover is common.
Question #50
Medium
Which gas is most responsible for the greenhouse effect among these?
Correct Answer: Option C
Explanation: CO₂ is a major greenhouse gas.
Memory Trick: CO₂ = Climate.
Exam Tip: Current environmental topics appear regularly.
Question #51
Medium
Which scientist proposed the theory of evolution by natural selection?
Correct Answer: Option B
Explanation: Darwin proposed natural selection.
Memory Trick: Darwin = Evolution.
Exam Tip: Scientists and discoveries are high-frequency.
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