NCERT Class 8 Science Question/Answers

Important Terms to Learn Before Starting Making Notes 🗒 Amplitude (अम्लान): The maximum extent of a vibration or oscillation, measured from the position of equilibrium. Eardrum (कान का ड्रम): A thin membrane that vibrates in response to sound waves and transmits them to the middle ear. Frequency (आवृत्ति): The number of cycles of a periodic […]

Important Terms to Learn Before Starting Making Notes 🗒 Ball Bearing (गेंद असर): A type of bearing that uses balls to maintain the separation between the bearing races, reducing rotational friction and supporting radial and axial loads. Drag (घर्षण बल): The resistance force caused by the motion of a body through a fluid, such as

Important Terms to Learn Before Starting Making Notes 🗒 Atmospheric Pressure (वायुमंडलीय दबाव): The force exerted by the weight of the atmosphere on a surface. Contact Force (स्पर्श बल): A force that acts on objects when they are in physical contact with each other. Electrostatic Force (स्थिर वैद्युत बल): The force between charged objects. Force

Important Terms to Learn Before Starting Making Notes 🗒 Adam’s Apple (गले का बटन): The lump or protrusion formed by the angle of the thyroid cartilage surrounding the larynx, more prominent in males. Adolescence (किशोरावस्था): The transitional period between childhood and adulthood, typically involving physical and psychological development. Adrenalin (एड्रेनलिन): A hormone released by the

Important Terms to Learn Before Starting Making Notes 🗒 Asexual Reproduction (अलैंगिक प्रजनन): A mode of reproduction in which offspring arise from a single organism, without the involvement of gametes (sex cells). Binary Fission (द्विविभाजन): A form of asexual reproduction in which a single organism divides into two equal parts, each becoming a new organism.

Important Terms to Learn Before Starting Making Notes 🗒 Biodiversity (जैव विविधता): The variety of plant and animal life in a particular habitat or in the world as a whole. Biosphere Reserve (जैवमंडल संरक्षित क्षेत्र): Protected areas aimed at conserving the biodiversity and promoting sustainable use of natural resources. Deforestation (वन-विनाश): The clearing or thinning

Important Terms to Learn Before Starting Making Notes 🗒 Acid Rain (अम्लीय वर्षा): Rainfall made acidic by atmospheric pollution, causing environmental harm, particularly to forests and lakes. Calorific Value (ऊष्मीय मान): The amount of energy produced by the complete combustion of a material or fuel. Combustion (दहन): A chemical process in which a substance reacts

Important Terms to Learn Before Starting Making Notes 🗒 Coal (कोयला): A black or brownish-black sedimentary rock that is used as a fuel and in the production of electricity. Coal Gas (कोयला गैस): A flammable gaseous fuel made from coal and used for heating and lighting. Coal Tar (कोलतार): A thick, black liquid produced during

Important Terms to Learn Before Starting Making Notes 🗒 Algae (शैवाल): Simple, typically aquatic plants that can perform photosynthesis. Antibiotics (प्रतिजैविक): Medicines that inhibit the growth of or destroy bacteria. Antibodies (एंटीबॉडी): Proteins produced by the immune system to neutralize pathogens like bacteria and viruses. Bacteria (जीवाणु): Microscopic single-celled organisms that can be beneficial or

Important Terms to Learn Before Starting Making Notes 🗒 Agricultural (कृषि संबंधी): Related to the science, art, and business of cultivating soil, producing crops, and raising livestock. Practices (अभ्यास): The customary actions or methods in agriculture, such as planting, harvesting, and pest control. Animal Husbandry (पशुपालन): The branch of agriculture concerned with the care and