bihar board class 10 science objective question

Bihar Board Class 10 Science exams require thorough preparation, especially in objective-type questions. These questions test conceptual understanding and factual knowledge. Below are well-structured questions and answers covering all key topics of Science, helping students achieve better results and improve their grasp of the subject matter.

Physics Questions and Answers

Question: What is the SI unit of force?

Answer: The SI unit of force is the Newton (N).

Question: Name the phenomenon responsible for the blue color of the sky.

Answer: The phenomenon responsible for the blue color of the sky is Rayleigh scattering.

Question: What is the unit of electric current?

Answer: The unit of electric current is the Ampere (A).

Question: What is the formula for calculating work done?

Answer: The formula for calculating work done is Work = Force × Displacement × cos(θ).

Question: Define power.

Answer: Power is the rate at which work is done or energy is transferred.

Question: State the principle of a hydraulic lift.

Answer: A hydraulic lift works on Pascal’s principle, which states that pressure applied to a confined fluid is transmitted equally in all directions.

Question: What is Ohm’s law?

Answer: Ohm’s law states that the current through a conductor is directly proportional to the voltage across it and inversely proportional to the resistance.

Question: Name the device used to measure potential difference.

Answer: The device used to measure potential difference is a voltmeter.

Question: What is the frequency of alternating current in India?

Answer: The frequency of alternating current in India is 50 Hz.

Question: Define critical angle in the context of optics.

Answer: The critical angle is the angle of incidence in a denser medium for which the angle of refraction in a rarer medium is 90°.

Question: What type of mirror is used in car headlights?

Answer: Concave mirrors are used in car headlights.

Question: What is the speed of light in a vacuum?

Answer: The speed of light in a vacuum is approximately 3×1083 \times 10^83×108 meters per second.

Question: Define refraction.

Answer: Refraction is the bending of light as it passes from one medium to another of different density.

Question: What is the unit of power?

Answer: The unit of power is the Watt (W).

Question: State one use of a convex lens.

Answer: A convex lens is used in magnifying glasses.

Question: Define electromagnet.

Answer: An electromagnet is a magnet created by electric current flowing through a coil of wire.

Question: Name one natural source of energy.

Answer: One natural source of energy is the Sun.

Question: What is the principle of conservation of energy?

Answer: The principle of conservation of energy states that energy can neither be created nor destroyed, only transformed from one form to another.

Question: Define inertia.

Answer: Inertia is the property of an object to resist changes in its state of motion or rest.

Question: What is the symbol for resistivity?

Answer: The symbol for resistivity is ρ (rho).

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Chemistry Questions and Answers

Question: What is the chemical formula of water?

Answer: The chemical formula of water is H₂O.

Question: Define acid.

Answer: Acids are substances that release hydrogen ions (H⁺) in aqueous solutions.

Question: What is the pH of a neutral solution?

Answer: The pH of a neutral solution is 7.

Question: Name the gas evolved when a metal reacts with acid.

Answer: The gas evolved when a metal reacts with acid is hydrogen gas.

Question: What is the common name of sodium bicarbonate?

Answer: The common name of sodium bicarbonate is baking soda.

Question: Define oxidation.

Answer: Oxidation is the process in which a substance gains oxygen or loses electrons.

Question: Name the element with the symbol ‘O’.

Answer: The element with the symbol ‘O’ is Oxygen.

Question: What is the main component of biogas?

Answer: The main component of biogas is methane (CH₄).

Question: What is the molecular mass of carbon dioxide?

Answer: The molecular mass of carbon dioxide is 44 g/mol.

Question: Define alloy.

Answer: An alloy is a homogeneous mixture of two or more metals or a metal and a non-metal.

Question: What is the chemical name of table salt?

Answer: The chemical name of table salt is sodium chloride (NaCl).

Question: What type of bond is formed between sodium and chlorine in NaCl?

Answer: An ionic bond is formed between sodium and chlorine in NaCl.

Question: Define electrolyte.

Answer: An electrolyte is a substance that conducts electricity when dissolved in water.

Question: Name the process used to separate crude oil into its components.

Answer: The process used to separate crude oil into its components is fractional distillation.

Question: What is the chemical formula of ammonia?

Answer: The chemical formula of ammonia is NH₃.

Question: What is the atomic number of carbon?

Answer: The atomic number of carbon is 6.

Question: Name one strong acid.

Answer: One strong acid is hydrochloric acid (HCl).

Question: Define catalyst.

Answer: A catalyst is a substance that increases the rate of a chemical reaction without undergoing permanent change itself.

Question: What is the SI unit of molar mass?

Answer: The SI unit of molar mass is grams per mole (g/mol).

Question: Name the ore of aluminum.

Answer: The ore of aluminum is bauxite.

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Biology Questions and Answers

Question: What is the basic unit of life?

Answer: The basic unit of life is the cell.

Question: Name the process by which plants make their food.

Answer: The process by which plants make their food is photosynthesis.

Question: What is the powerhouse of the cell?

Answer: The powerhouse of the cell is the mitochondria.

Question: What is the function of xylem in plants?

Answer: The function of xylem in plants is to transport water and minerals.

Question: Define heredity.

Answer: Heredity is the transmission of genetic traits from parents to offspring.

Question: Name the male reproductive organ in humans.

Answer: The male reproductive organ in humans is the testes.

Question: What is the full form of DNA?

Answer: The full form of DNA is Deoxyribonucleic Acid.

Question: Name the disease caused by a deficiency of Vitamin D.

Answer: The disease caused by a deficiency of Vitamin D is rickets.

Question: What is the normal pH of human blood?

Answer: The normal pH of human blood is approximately 7.4.

Question: Define osmosis.

Answer: Osmosis is the movement of water molecules from a region of lower solute concentration to higher solute concentration through a semipermeable membrane.

Question: What is the role of hemoglobin?

Answer: The role of hemoglobin is to transport oxygen in the blood.

Question: Name one non-communicable disease.

Answer: One non-communicable disease is diabetes.

Question: What is the structural and functional unit of the kidney?

Answer: The structural and functional unit of the kidney is the nephron.

Question: Define fermentation.

Answer: Fermentation is the process of breaking down glucose into simpler compounds, releasing energy in the absence of oxygen.

Question: Name the process by which plants lose water vapor.

Answer: The process by which plants lose water vapor is transpiration.

Question: What is the largest organ in the human body?

Answer: The largest organ in the human body is the skin.

Question: What is the function of chlorophyll?

Answer: The function of chlorophyll is to capture light energy for photosynthesis.

Question: Name the organ responsible for pumping blood in the human body.

Answer: The organ responsible for pumping blood in the human body is the heart.

Question: What are the end products of aerobic respiration?

Answer: The end products of aerobic respiration are carbon dioxide, water, and energy (ATP).

Question: Define biodiversity.

Answer: Biodiversity refers to the variety of life forms found in a particular ecosystem or the entire Earth.