Bihar Board Class 10 Science Objective Questions: 50 Important VVI MCQs with Answers
50 important Bihar Board Class 10 science objective questions from Physics, Chemistry and Biology chapters, grouped by chapter with answers and one-line explanations.
Looking for Bihar Board Class 10 science objective questions to revise fast before the exam? This guide gives you 50 important VVI MCQs from the Physics, Chemistry, and Biology chapters of the BSEB Class 10 syllabus, each with the correct answer and a one-line explanation. Use it as a quick objective-round revision sheet, then move to full-length mock tests to check your speed and accuracy under exam conditions.
Bihar Board Class 10 (Matric) Science: Why Objective Questions Matter
The Bihar Board Class 10 (Matric) Science paper carries a large objective (MCQ) section every year, so getting your Bihar board class 10 science objective questions right is one of the fastest ways to lift your overall score. As per the official notification, BSEB's online exam-form window for the Matric Annual Examination 2027 reopened with a late fee from 16 to 31 October 2026 for students who missed the original 15 October 2026 deadline, and the Board has said this window will not be extended further; the date sheet and admit card for Matric 2027 have not yet been released on the official portals (exam.biharboardonline.org, biharboardonline.bihar.gov.in). For a full breakdown of subjects and marking scheme, see our Bihar Board Matric Exam 2027 preparation guide. To practice beyond this list, the Bihar Board Class 10 (Matric) — All In One test series has 48 tests and 1,020 questions in Hindi and English — start with the free mock test before you decide to buy.
50 Bihar Board Class 10 Science Objective Questions (VVI) with Answers
These objective questions are grouped chapter-wise across Chemistry, Biology, and Physics so you can revise one topic at a time. Each question has four options, the correct answer, and a short reason so you understand the concept, not just memorise the letter.
Chapter: Chemical Reactions and Equations
Which type of reaction occurs when a magnesium ribbon is burnt in air?
- Combination reaction
- Decomposition reaction
- Displacement reaction
- Double displacement reaction
Answer: Combination reaction — Mg combines with O2 to form a single product, MgO.
What is formed when quicklime reacts with water?
- Slaked lime
- Baking soda
- Washing soda
- Plaster of Paris
Answer: Slaked lime (Ca(OH)2) — the reaction is exothermic and releases heat.
Rancidity of fatty food can be prevented by:
- Adding antioxidants
- Adding water
- Heating the food
- Adding sugar
Answer: Adding antioxidants — they stop the oxidation of fats and oils.
Fe2O3 + 2Al → Al2O3 + 2Fe is an example of which reaction?
- Displacement reaction
- Double displacement reaction
- Decomposition reaction
- Combination reaction
Answer: Displacement reaction — aluminium displaces iron from its oxide.
Which gas is evolved when dilute HCl reacts with zinc granules?
- Hydrogen gas
- Oxygen gas
- Carbon dioxide gas
- Chlorine gas
Answer: Hydrogen gas — Zn + 2HCl → ZnCl2 + H2.
Chapter: Acids, Bases and Salts
Which indicator turns pink in a basic solution and stays colourless in an acidic solution?
- Phenolphthalein
- Methyl orange
- Litmus
- Universal indicator
Answer: Phenolphthalein — it is colourless in acid and pink in base.
What is the pH of a neutral solution?
- 7
- 0
- 14
- Less than 7
Answer: 7 — pH below 7 is acidic and above 7 is basic.
Baking soda is chemically known as:
- Sodium bicarbonate
- Sodium carbonate
- Calcium carbonate
- Sodium chloride
Answer: Sodium bicarbonate (NaHCO3).
Which acid is present in curd?
- Lactic acid
- Citric acid
- Acetic acid
- Tartaric acid
Answer: Lactic acid, formed when milk is converted to curd by bacteria.
Plaster of Paris is obtained by heating:
- Gypsum
- Limestone
- Marble
- Washing soda
Answer: Gypsum (CaSO4·2H2O), heated to about 373 K.
Chapter: Metals and Non-metals
Which metal is stored in kerosene?
- Sodium
- Iron
- Copper
- Zinc
Answer: Sodium — it is highly reactive with air and water.
Which is the most malleable and ductile metal?
- Gold
- Iron
- Copper
- Silver
Answer: Gold.
Brass is an alloy of which two metals?
- Copper and zinc
- Copper and tin
- Lead and tin
- Iron and carbon
Answer: Copper and zinc.
Ionic compounds have high melting points because of:
- Strong electrostatic force between ions
- Weak bonding between atoms
- Presence of free electrons
- Covalent bonding
Answer: Strong electrostatic force of attraction between oppositely charged ions.
Which non-metal is lustrous?
- Iodine
- Sulphur
- Carbon
- Phosphorus
Answer: Iodine — it shows metallic lustre despite being a non-metal.
Chapter: Carbon and Its Compounds
How many covalent bonds are present in one molecule of methane?
- 4
- 2
- 3
- 1
Answer: 4 — CH4 has four single C–H covalent bonds.
Which functional group is present in ethanol?
- -OH (hydroxyl)
- -COOH (carboxyl)
- -CHO (aldehyde)
- -CO (ketone)
Answer: -OH, the hydroxyl group.
Saturated hydrocarbons are also called:
- Alkanes
- Alkenes
- Alkynes
- Aromatic compounds
Answer: Alkanes.
Vinegar used at home is a solution of:
- Acetic acid in water
- Formic acid in water
- Citric acid in water
- Lactic acid in water
Answer: Acetic acid in water (about 5–8%).
Converting vegetable oil into solid fat using hydrogen and a nickel catalyst is called:
- Hydrogenation
- Esterification
- Saponification
- Oxidation
Answer: Hydrogenation.
Chapter: Life Processes
The functional unit of the kidney is the:
- Nephron
- Neuron
- Alveolus
- Nephridia
Answer: Nephron — it filters blood to form urine.
Photosynthesis occurs mainly in which cell organelle?
- Chloroplast
- Mitochondria
- Nucleus
- Ribosome
Answer: Chloroplast, which contains chlorophyll.
Which blood vessel carries oxygenated blood from the lungs to the heart?
- Pulmonary vein
- Pulmonary artery
- Aorta
- Vena cava
Answer: Pulmonary vein.
Complete oxidation of food to release energy mainly occurs in the:
- Mitochondria
- Golgi body
- Nucleus
- Ribosome
Answer: Mitochondria, often called the powerhouse of the cell.
Xylem tissue in plants is mainly responsible for transporting:
- Water and minerals
- Food (sugars)
- Hormones
- Oxygen only
Answer: Water and minerals from roots to the rest of the plant.
Chapter: Control and Coordination
The gap between two neurons where a nerve impulse passes chemically is called a:
- Synapse
- Dendrite
- Axon
- Nerve ending
Answer: Synapse.
Which hormone is responsible for the body's "fight or flight" response?
- Adrenaline
- Insulin
- Thyroxine
- Growth hormone
Answer: Adrenaline, released by the adrenal glands.
Which plant hormone, made at the shoot tip, promotes cell elongation?
- Auxin
- Cytokinin
- Abscisic acid
- Ethylene
Answer: Auxin.
Deficiency of which hormone (due to lack of iodine) causes goitre?
- Thyroxine
- Insulin
- Adrenaline
- Growth hormone
Answer: Thyroxine.
An involuntary action controlled by the spinal cord without direct involvement of the brain is a:
- Reflex action
- Voluntary action
- Conscious action
- Learned behaviour
Answer: Reflex action.
Chapter: Heredity and Evolution
Who proposed the basic laws of inheritance using pea plants?
- Gregor Mendel
- Charles Darwin
- Louis Pasteur
- Carl Linnaeus
Answer: Gregor Mendel.
In human beings, the sex of a child is determined mainly by the:
- Father's chromosome (X or Y sperm)
- Mother's chromosome
- Both parents equally
- Environment
Answer: Father's chromosome, since the sperm carries either X or Y.
The study of fossils to trace evolutionary history is called:
- Paleontology
- Embryology
- Taxonomy
- Genetics
Answer: Paleontology.
A tall pea plant (TT) is crossed with a short plant (tt). The F1 generation will be:
- All tall (Tt)
- All short
- Half tall, half short
- All medium height
Answer: All tall (Tt), since tallness is the dominant trait.
Organs like a human hand and a bird's wing, which have the same basic structure but different functions, are called:
- Homologous organs
- Analogous organs
- Vestigial organs
- Fossil organs
Answer: Homologous organs.
Chapter: Light – Reflection and Refraction
The image formed by a plane mirror is always:
- Virtual and erect
- Real and inverted
- Virtual and inverted
- Real and erect
Answer: Virtual and erect, and of the same size as the object.
A dentist uses a concave mirror to see an enlarged image of the teeth by placing the object:
- Between the pole and focus
- At the focus
- At the centre of curvature
- Beyond the centre of curvature
Answer: Between the pole and focus, which gives a magnified virtual image.
What is the power of a lens with a focal length of 1 metre?
- 1 Dioptre
- 2 Dioptre
- 0.5 Dioptre
- 10 Dioptre
Answer: 1 Dioptre, since Power = 1/focal length (in metres).
The bending of light as it passes from one transparent medium to another is called:
- Refraction
- Reflection
- Dispersion
- Diffraction
Answer: Refraction.
A convex lens is also known as a:
- Converging lens
- Diverging lens
- Plano lens
- Concave lens
Answer: Converging lens, because it bends light rays inward.
Chapter: Electricity
The SI unit of electrical resistance is the:
- Ohm
- Volt
- Ampere
- Watt
Answer: Ohm.
Which instrument is used to measure current in a circuit, and how is it connected?
- Ammeter, in series
- Voltmeter, in series
- Rheostat, in parallel
- Ohmmeter, in parallel
Answer: Ammeter, connected in series in the circuit.
Ohm's law describes the relationship between:
- Potential difference and current
- Power and resistance only
- Current and time
- Charge and resistance only
Answer: Potential difference and current, at constant temperature (V = IR).
In household electrical circuits, appliances are usually connected in:
- Parallel
- Series
- Mixed arrangement only
- No fixed pattern
Answer: Parallel, so each appliance works independently.
According to Joule's law, the heat produced by a current I flowing through resistance R for time t is:
- H = I²Rt
- H = IR²t
- H = I²R²t
- H = IRt
Answer: H = I²Rt.
Chapter: Magnetic Effects of Electric Current
Which device converts electrical energy into mechanical energy?
- Electric motor
- Electric generator
- Transformer
- Galvanometer
Answer: Electric motor.
Which rule gives the direction of force on a current-carrying conductor placed in a magnetic field?
- Fleming's left-hand rule
- Fleming's right-hand rule
- Right-hand thumb rule
- Lenz's law
Answer: Fleming's left-hand rule, used for motors.
The production of induced current in a coil due to a changing magnetic field is called:
- Electromagnetic induction
- Electrolysis
- Electroplating
- Magnetisation
Answer: Electromagnetic induction.
In a household circuit, the fuse wire is always connected:
- In series with the live wire
- In parallel with the live wire
- In series with the earth wire
- In parallel with the neutral wire
Answer: In series with the live wire, so it breaks the circuit during overload.
A compass needle placed near a current-carrying wire shows deflection because of the:
- Magnetic effect of current
- Heating effect of current
- Chemical effect of current
- Electrostatic effect
Answer: Magnetic effect of current, as shown by Oersted's experiment.
How to Practice More Bihar Board Class 10 Science Objective Questions
Fifty questions are enough to spot your weak chapters, but the real test is attempting objective questions under a timer, the way they appear in the actual Science paper. The Bihar Board Class 10 (Matric) — All In One test series is built chapter-wise across all subjects for exactly this reason, with solutions explained for every question so you know where you went wrong. Go through this objective list once, mark the chapters where you hesitated, and then attempt a full mock on those chapters to lock in the concepts before exam day.
Frequently Asked Questions
How many objective questions are usually asked in Bihar Board Class 10 Science?
The exact number and marking pattern for the current cycle are set out in BSEB's official Matric exam notification and model question papers; refer to the official portal for the confirmed pattern rather than any third-party estimate.
Are these 50 questions enough to score well in the objective section?
They cover the most frequently tested concepts across Physics, Chemistry, and Biology chapters, making them a strong starting point, but you should also attempt full-length chapter-wise mock tests to cover the rest of the syllabus.
Which chapters give the most objective questions in BSEB Class 10 Science?
Chemical Reactions and Equations, Acids-Bases-Salts, Metals and Non-metals, Life Processes, Electricity, and Light are among the chapters that consistently contribute a large share of objective questions in past papers.
Has BSEB released the Matric 2027 admit card or date sheet yet?
No. As per the official notification, the date sheet and admit card for the Matric Annual Examination 2027 have not been released on the official BSEB portals as of this writing; check biharboardonline.bihar.gov.in for updates.
Where can I practice more Bihar Board Class 10 science objective questions online?
You can practice chapter-wise and full-length mock tests, with solutions, on SeatBeat's Bihar Board Class 10 (Matric) test series page.
Don't stop at reading answers — start with the free mock test to see how you perform under real exam conditions, then unlock the full Bihar Board Class 10 (Matric) — All In One test series for complete, chapter-wise practice before your Science paper.