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 10^8 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).
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.
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.
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