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Sound – Class 9 Science Complete Notes

1. What is Sound? Sound is a form of energy which produces a sensation of hearing in our ears. Sound is produced by vibrating objects. Examples include vibrating tuning fork, vocal cords in humans, bells, musical instruments, etc. Vibration: Rapid to-and-fro (back and forth) motion of an object. Short Question: Can sound be produced without vibration? Answer: No, sound cannot be produced without vibration. 2. Medium of Sound The substance through which sound travels is called a medium . Sound can travel through solids, liquids, and gases but cannot travel through vacuum . Process of Sound Propagation: When an object vibrates, it makes the air particles around it vibrate. These air particles move back and forth from their original (rest) position. The vibrating air particles push nearby air particles. This causes the nearby particles to also start vibrating. In this way, vibrations pass from one particle to another. This process continues through the medi...
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CBSE Class 10 Syllabus & Previous Year Question Papers PDF – Official Downloads (2025–26)

Preparing for the CBSE Class 10 board exams requires the right strategy, reliable study material, and a clear understanding of the latest syllabus. One of the most effective ways to score well is by studying the CBSE Class 10 syllabus 2025–26 thoroughly and practicing CBSE Class 10 Previous Year Question Papers . These question papers help students understand the exam pattern, marking scheme, and important topics asked frequently in board exams. The Central Board of Secondary Education releases all official syllabus documents, previous year question papers, sample papers, and marking schemes on its official platforms. In this article, students will find direct official links to these CBSE resources along with easy guidance on how to use them effectively for exam preparation. Students are advised to rely only on CBSE official website question papers and study materials to ensure accurate, updated, and result-oriented preparation for the CBSE Class 10 board exams.
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How Do Organisms Reproduce? – Class 10 Science Notes

How Do Organisms Reproduce? Topics covered Why Do Organisms Reproduce? DNA Copying & Variations Asexual Reproduction Fission Fragmentation Regeneration Budding Vegetative Propagation Spore Formation Sexual Reproduction Sexual Reproduction in Plants Sexual Reproduction in Humans Male Reproductive System Female Reproductive System Menstruation Reproductive Health Why Do Organisms Reproduce? Reproduction is the biological process by which living organisms produce new individuals of their own kind, ensuring the continuation of their species. Importance of reproduction: Maintains continuity of species Increases population Transfer of characters from parent to offspring Variation helps in survival & evolution   Role of DNA in Reproduction DNA is the genetic material present in chromosomes. It stores information to control body structure an...
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How Do Organisms Reproduce? — Topic-wise Question Bank

How Do Organisms Reproduce? — Topic-wise Question Bank Topics covered: DNA Copying & Variation Asexual Reproduction (Fission, Fragmentation, Budding, Regeneration, Vegetative Propagation, Spore formation) Sexual Reproduction — General Reproduction in Flowering Plants Reproduction in Humans Reproductive Health & Contraceptives Mixed / Revision Practice Topic 1 — DNA Copying & Variation Key idea: DNA is copied during reproduction. Copies are mostly accurate but small changes (variations) occur — these cause differences between individuals and drive evolution. MCQs Q1. DNA is the molecule which (a) stores hereditary information (b) helps in copying proteins (c) stores energy (d) gives structural support Show Answer Answer: (a) DNA stores hereditary information (blueprint). Proteins are made using the information in DNA but DNA itself doesn't "copy proteins". Q2. When DNA copying makes small...
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Carbon and Its Compounds — Complete CBSE Class 10 Notes

Carbon and Its Compounds — Complete CBSE Class 10 Notes Carbon and Its Compounds Class 10 Notes (CBSE / NCERT): This chapter explains the basics of organic chemistry such as covalent bonding, hydrocarbons, functional groups, ethanol, ethanoic acid, soaps and detergents. These notes are prepared according to the latest CBSE Class 10 Science syllabus and follow NCERT textbook concepts. All topics are explained in board-answer format so that students can learn and directly write in exams. Previous Year Questions (PYQ), important reactions, diagrams, naming rules, and questions are included to help students score full marks in board examinations. Contents Basic Facts about Carbon Versatility of Carbon Polymerisation & Isomerism Covalent Bonding & Properties Types of Covalent Bonds Allotropes: Diamond, Graphite & Fullerene Hydrocarbons Functional Groups & IUPAC Homologous Series Isomerism & Electron-dot ...
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CLASS 10 SCIENCE NOTES: CHAPTER - METALS AND NON - METALS

Metals and Non‑Metals — Class 10 Notes 1. What are Metals and Non‑Metals? Metals are elements that typically lose electrons to form positive ions (cations). Examples: iron (Fe), copper (Cu), aluminium (Al), silver (Ag), gold (Au). Non‑metals are elements that usually gain electrons to form negative ions (anions) or share electrons (covalent bonding). Examples: sulphur (S), phosphorus (P), oxygen (O), carbon (C). 2. Physical properties — quick comparison Metals Property Observation / Example Notes / Exceptions Appearance (lustre) Shiny metallic surface (freshly cut) Iron, Cu, Al Hardness Generally hard Varies — sodium & potassium are very soft Malleability Can be beaten into thin sheets Gold & silver are most malleable Ductility Can be drawn into wires Gold is extremely ductile (1 g → long wire) Con...
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