Tamil Nadu Board of Secondary Education Class 8 Science Syllabus - Free PDF Download
Tamil Nadu Board of Secondary Education Syllabus 2026-27 Class 8: The Tamil Nadu Board of Secondary Education Class 8 Science Syllabus for the examination year 2026-27 has been released by the Tamil Nadu Board, Tamil Nadu Board of Secondary Education. The board will hold the final examination at the end of the year following the annual assessment scheme, which has led to the release of the syllabus. The 2026-27 Tamil Nadu Board of Secondary Education Class 8 Science Board Exam will entirely be based on the most recent syllabus. Therefore, students must thoroughly understand the new Tamil Nadu Board of Secondary Education syllabus to prepare for their annual exam properly.
The detailed Tamil Nadu Board of Secondary Education Class 8 Science Syllabus for 2026-27 is below.
Academic year:
Tamil Nadu Board of Secondary Education Class 8 Science Revised Syllabus
Tamil Nadu Board of Secondary Education Class 8 Science Course Structure 2026-27 With Marking Scheme
| # | Unit/Topic | Marks | Marks with options |
|---|---|---|---|
| 1 | Measurement | ||
| 2 | Force and Pressure | ||
| 3 | Light | ||
| 4 | Heat | ||
| 5 | Electricity | ||
| 6 | Sound | ||
| 7 | Magnetism | ||
| 8 | Universe and Space Science | ||
| 9 | Matter Around Us | ||
| 10 | Changes Around Us | ||
| 11 | Air | ||
| 12 | Atomic Structure | ||
| 13 | Water | ||
| 14 | Acids and Bases | ||
| 15 | Chemistry in Everyday Life | ||
| 16 | Microorganisms | ||
| 17 | Plant Kingdom | ||
| 18 | Organisation of Life | ||
| 19 | Movements in Animals | ||
| 20 | Reaching the Age of Adolescence | ||
| 21 | Crop Production and Management | ||
| 22 | Conservation of Plants and Animals | ||
| 23 | Libre Office Calc | ||
| Total | - | - |
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Syllabus
1 Measurement [Revision]
- Measurements
- Measurement
- The need for measurement in daily life
- Physical Quantities
- Unit and Its Types
- Unit Systems
- Introduction
- Types of Unit System
- Properties of Matter and Their Measurement
- Base Quantities and Units
- Clocks
- Accuracy in Measurements
- Basic Concept of Estimation and Approximation of Numbers
- Definition: Estimation
- Benefits of Estimation
- Real-Life Example
- Rounding off
2 Force and Pressure [Revision]
- Force
- Definition: Force
- Formula: Force
- Key Points: Force
- Effect of Force
- A Force can change the State of motion
- Force can change the shape of an object
- Stops or tries to stop a moving body
- Changes or tries to change the direction of motion of a moving body
- Like parallel forces effect
- Unbalanced forces effect
- Unlike parallel forces effect
- Thrust and Pressure
- Factors Affecting Pressure
- Atmospheric Pressure
- Measurement of Atmospheric Pressure
- Mercury Barometer (Simple Barometer)
- Buoyancy Force (Upthrust Force)
- Introduction
- Experiment 1
- Experiment 2
- Pressure of liquid
- Introduction
- Experiment 1
- Experiment 2
- Pascal’s Law
- Application of Pascal’s Law
- Surface Tension
- Viscous Force or Viscosity
- Force of Friction
- Types of Friction>Rolling Friction
- Increasing and Reducing Friction
3 Light [Revision]
- Climatic Factors > Light
- Mirrors
- Spherical Mirrors
- Definition: Spherical Mirror
- Definition: Concave Mirror
- Definition: Convex Mirror
- Definition: Pole
- Definition: Centre of Curvature
- Definition: Radius of Curvature
- Definition: Principal Axis
- Introduction
- Types of Spherical Mirrors
- Activity
- Key Points: Spherical Mirrors
- Position and Nature of Image Formed by Spherical Mirrors
- Spherical Mirror > Concave Mirror
- Introduction
- Image formation by Concave Mirror
- Uses of Concave Mirror
- Spherical Mirror > Convex Mirror
- Introduction
- Image Formation by Convex Mirror
- Uses of Convex Mirror
- Law of Reflection of Light
- Laws of Reflection
- Experiment
- Types of Reflection
- Multiple Reflections
- Refraction of Light
- Laws of Refraction
- Key Points: Laws of Refraction
- Prism
- Definition: Prism
- Dispersion of Light
4 Heat [Revision]
- Heat
- Introduction
- Units of Heat
- Effects of Heat
- Transfer of Heat
- Conduction
- Convection
- Environmental Issues
- Calorimetry
- The Temperature and a Thermometer
- Introduction
- Unit of Temperature
- Experiment: 1
- Experiment: 2
- Scales of Thermometers
- Fahrenheit scale
- Celsius temperature scale
- Kelvin scale (Absolute scale)
- Relationship between the three scales of temperature
- Conversion of Temperature from celsius scale to kelvin scale and vice-versa
- Specific Heat Capacity
- Definition: Specific Heat Capacity
- Formula: Specific Heat Capacity
- Key Points: Specific Heat Capacity
- Thermostat
- Thermos Flask (Dewar Flask)
- Introduction
- Structure and Working
- Function of the thermos flask
5 Electricity [Revision]
- Electricity
- Structure of the Atom and Nucleus
- Electric Charge
- Electric Force
- Transfer of Charges
- Origin of an Electric Charge
- Experiment
- Direction of the Electric Current - Conventional and Electronic Flow
- Flow of Charges (Electrons) Between Conductor
- Electroscope
- Lightning and Lightning Safety
- Introduction
- Causes of Lightning
- Precautions to Stay Safe from Lightning
- Electric Circuit
- Key Points: Electric Circuit
- Types of Circuits: Simple Circuit
- Types of Circuits: Series Circuit
- Types of Circuits: Parallel Circuit
- Effects of Electric Current
- Chemical Effects of Electric Current
- Chemical effect of electric current
- Application of Chemical effect of electric current
- Electroplating
- Chemical Effects of Electric Current
- Heating Effect of Electric Current
- Definition: Heating Effect of Electric Current
- Key Points: Heating Effect of Electric Current
6 Sound [Revision]
- Sound Waves
- Production of Sound
- Introduction
- Production of Sound Using a Tuning Fork
- Experiment
- Propagation of Sound
- Introduction
- Experiment 1
- Experiment 2
- Characteristics of Sound
- Loudness and Intensity
- Definition: Loudness
- Key Points: Loudness and Intensity
- Pitch and frequency
- Definition: Pitch
- Quality and Wave Form
- Quality or Timbre
- Audibility and Range
- Audibility and Range
- Bats and Their Navigation Mechanism
- Experiment
- Uses of Different Types of Sound
- Loudness and Intensity
- Sound and Music
- Sound and Music
- Experiment
- Sound Produced by Humans
- Environmental Issues
- Noise Pollution
- Definition: Noise Pollution
- Introduction
- Noise Pollution
- Hearing Loss
7 Magnetism [Revision]
- Discovery of Magnets
- Magnet
- Classification of Magnets
- Classification of Magnets
1) Natural Magnet
2) Artificial Magnet
- Classification of Magnets
- Magnetic Properties of Materials
- Magnetic Field
- Introduction
- Definition: Magnetic Field
- Experiment
- Magnetic Materials
- Selection of Magnetic Materials
- Artificial Magnets
- Concept of Magnetism
- Uses of Magnets
8 Universe and Space Science [Revision]
- The Universe
- Galaxy and Its Types
- Galaxy
- Types of Galaxy
- Our Solar System
- Rockets and Its Structure
- Propellants and Its Types
- Satellite Launch Vehicles
- Key Points: Satellite Launch Vehicle
- Indian Space Research Organization (ISRO)
- ISRO
- Satellite Launching and Applications
- Earth Observation and Disaster Management
- Space Exploration Milestones
- Cost-Effective Innovations and Societal Impact
- Concept of Space Missions
- Key Points: Space Missions
- Moon Missions
- Key Points: Moon Missions
- Mars Missions
- Key Points: Mars Missions
- Indian Scientist
- National Aeronautics and Space Administration (NASA)
- NASA Space Mission: Apollo Mission
- NASA’s work with ISRO
- Work of Indians at NASA
9 Matter Around Us [Revision]
- Matter (Substance)
- Experiment 1
- Experiment 2
- Experiment 3
- Experiment 4
- Substance (Matter)
- Physical Nature of matter
- Chemical properties
- Characteristics of Particles (Molecules) of Matter
- Characteristics of particles or matter
- Classification of Matter and Particle
- Experiment
- States of Matter
- The Solid State
- The Solid State of Matter
- Characteristics of Solids
- The Liquid State
- The Liquid State of Matter
- Characteristics of Liquids
- The Gaseous State
- The Gaseous State of Matter
- Characteristics of Gases
- The Solid State
- Elements
- Experiment
- Elements
- Symbols Used to Represent Atoms of Different Elements
- Earth and Elements
- Physical Properties of Metals
- Key Points: Physical Properties of Metals
- Non-Metals
- Definition: Non-Metals
- Definition: Metalloids or Semi-Metals
- Physical Properties of Non-metal
- Key Points: Physical Properties of Non-metal
- Type of Element: Metalloid
- Metalloid
- General Properties of Metalloid
- Compound
- Introduction
- Experiment 1
- Experiment 2
- Types of Compound
- Experiment
- Types of Compound
10 Changes Around Us [Revision]
- Chemical Reaction
- Definition: Chemical Change
- Definition: Reactants
- Definition: Products
- Factors Determining Chemical Changes
- Effects of Chemical Changes: Biological Effects
- Effects of Chemical Changes: Environmental Effects
- Effects of Chemical Changes: Production of Heat, Light, Sound and Pressure
11 Air [Revision]
- Air Around Us
- Air is a Mixture
- Occurrence of Oxygen
- Properties of Oxygen
- Importance of Oxygen
- Occurrence of Nitrogen
- Properties of Nitrogen
- Importance of Nitrogen
- Nitrogen Fixation
- Composition and Components of Air
- Introduction
- Uses of Gases in Air
- Carbon Dioxide
- Carbon Dioxide: Properties and Importance
- Experiment
- Physical and Chemical Properties
- Uses of Carbon Dioxide
- Properties of Carbon Dioxide
- Green House Effect
- Preventive Measures of Green House Effect
- Preventive Measures of Global Warming
- Acid Rain
- Key Points: Acid Rain
- Preventive Measures of Acid Rain
12 Atomic Structure [Revision]
- Atoms: Building Blocks of Matter
- Introduction of Atom
- Discovery of Charged Particles and the Structure of an Atom
- Dalton's Atomic Theory
- Advantages and Limitations of Dalton’s Atomic Theory
- Discovery of Charged Particles in Matter
- Cathode Ray Tube (CRT) experiment
- Atomic Models
- Advantage and Limitations of Thomson’s Atomic Model
- Periodic Trends in the Modern Periodic Table
- Definition: Periodic Trends
- Definition: valency
- Different Ways to Determine Valency
- Variable Valency
- Ions (Radicals) and Its Types
- Radicals
- Formation of Radicals
- Types of Radicals
- Different Valent Ions
- Chemical Formula or Molecular Formula
- Chemical formulae of compounds : A recapitulation
- Naming Chemical Compounds
- Chemical Equations
- Definition: Chemical Equation
- Key Points: Chemical Equations
- Balancing Chemical Equation
- Key Points: Balancing Chemical Equations
- Laws of Chemical Combination
- Introduction
- Experiment
13 Water [Revision]
- Water: Our Lifeline
- Introduction
- Importance of Water for Sustaining Life
- Composition of Water
- Introduction
- Water Cycle
- Electrolysis of Water
- Introduction
- Experiment
- Preparation of Water
- Physical Properties of Water
- Physical Properties of Water:
- Nature
- Boiling point
- The freezing point of water or melting point of ice
- Density
- Anomalous expansion of water
- Latent heat of fusion of ice
- Latent heat of vaporization of water
- Specific heat capacity
- Chemical Properties of Water
- Chemical properties
- Dissociation of water
- Amphoteric nature
- Oxidising and reducing nature
- Hydrolytic reactions
- Formation of hydrates with metal salts
- Water - a Universal Solvent
- Universal Solvent
- Experiment: To show that ordinary tap water contains dissolved solids.
- Importance of dissolved salts in water.
- Air dissolved in water.
- Experiment: To show that tap water contains dissolved gases (air).
- Importance of air dissolved in water.
- Potable Water
- Purification of Water
- Classification of water: Soft and Hard Water
- Soft and Hard water
- Types of Hard water
- Temporary Hardness
- Permanent Hardness
- Advantage and Disadvantage of Hard Water
- Removal of Hardness of Water
- Softening of water
- Removal of temporary hardness
a) By boiling
b) Clark's method - Removal of permanent hardness
a) By washing soda method
b) lon-exchange/Permutit method
c) Calgon method
d) Synthetic resins method
⇒ Ion exchange resins are of two types
i) Cation exchange resins
ii) Anion exchange resins
- Degree of hardness of water
- Environmental Issues
- Water Pollution
- Definition: Water pollution
- Introduction
- Water Pollution
- Prevention and Control of Water Pollution
- Water Pollution in Tamilnadu
14 Acids and Bases [Revision]
- Acids
- Definition: Acid
- Properties of Acids > Physical Properties
- Key Points: Physical Properties of Acids
- Uses of Acids
- Bases (Alkalis)
- Definition: Base
- Definition: Alkali
- Properties of Bases > Physical Properties
- Key Points: Physical Properties of Bases
- Uses of Bases
- Types of Double Displacement: Neutralization Reaction
- Introduction of Neutralization
- Application of Neutralization
- Neutralization Reactions in Our Daily Life
- Indicators
- Similarities and Differences Between Acids and Bases
- Similarities and differences between acids and bases
- Acid solution in water conducts electricity
- What Happens to an Acid or a Base in a Water Solution?
15 Chemistry in Everyday Life [Revision]
- Hydrocarbons
- Definition: Hydrocarbons
- Definition: Saturated Hydrocarbons
- Definition: Unsaturated Hydrocarbons
- Definition: Alkanes
- Definition: Alkenes
- Definition: Alkynes
- Key Points: Hydrocarbons
- Sources of Hydrocarbons
- Conventional Sources of Energy > Natural Gas
- Other Gases
- Non-crystalline/Amorphous Forms: Coal
- Introduction
- Coal
- Types of Coal
- Extraction of Coal
- Non-crystalline/Amorphous Forms: Coke
- Coke
- Uses of Coke
- Petroleum
- Refining of Crude Petroleum
- Fuel
- Types of Fuel
- Fuel Efficiency
- Bio-energy
- Biogas plant
- Biomass
- Gobar gas
- Electricity Generation using Solar Energy
16 Microorganisms [Revision]
- Viruses
- Bacteria
- Fungi
- Algae
- Protozoa
- Prions
- Virions
- Useful micro-organisms
- Experiment
- Uses of Microorganisms:
- Harmful Microorganisms
- Relationship Between Man and Microbes Balances, Imbalances and Uses
17 Plant Kingdom [Revision]
- Sub-division Algae
- Kingdom Plantae
- Kingdom Plantae: Thallophyta (Fungi)
- Cryptogams > Division II- Bryophytes
- Bryophyta
- Activity
- Cryptogams > Division III- Pteridophytes
- Phanerogams > Division I-Gymnosperms
- Phanerogams > Division II- Angiosperms
- Angiosperms
- Activity
- Classification of Angiosperms
- Taxonomy and Systematics
- Taxonomy
- Systematics
- Classification of Taxonomy
- Plant Taxonomy
- Animal Taxonomy
- Nomenclature
- Definition: Nomenclature
- Key Points: Nomenclature of Carbon Compounds
- Medicinal Plants
18 Organisation of Life [Revision]
- Biological Organisation in Organisms
- Tissues - “The Teams of Workers”
- Introduction
- Differences Between Plant and Animal Tissues
- Human Organ System
- Physiological Processes in Organisms
- Homeostasis
- Diffusion
- Definition: Diffusion
- Osmosis
- Definition: Osmosis
- Osmoregulation
- Definition: Osmoregulation
- Key Points: Osmoregulation
- Metabolism
19 Movements in Animals [Revision]
- Movement and Locomotion
- Movement in Different Animals
- Human Body and Its Movements
- Types of Movements
- Human Skeleton System
- Introduction of The Human Skeleton System
- Function of Human Skeleton
- Parts of the Skeleton
- Structure of a Bone
- The Human Skeleton: Axial Skeleton
- The Human Skeleton: Appendicular Skeleton
- Muscles and Its Types
- Introduction
- Types of Muscles
- Activity
- Muscular System
20 Reaching the Age of Adolescence [Revision]
- Secondary Sex Characteristics
- Role of Hormones in Initiating Reproductive Function
- Reproductive Phase of Life in Humans
- Concept of Reproductive Health
- Nutritional Needs of Adolescents
- Personal Hygiene for Adolescence
21 Crop Production and Management [Revision]
- Crop and Its Types
- Soil Formation and Preparation for Agriculture
- Agricultural Implements
- Food Storage and Conservation of the Environment
- Manuring (Biomanuring)
- Fertilizers
- Introduction of Fertilizers
- Harmful Effects of Chemical Fertilizers
- Protection of crops
- Steps for Storing Grain
- Steps to Protect Grain from Damage
- Methods to Replenish Nutrients in Your Soil
- Improved methods of agriculture
- Improved seeds
- Irrigation
- Modern methods of irrigation
- Modern Irrigation Methods
- Food Security
- Introduction of Food security
- Importance of Food Security
- Agricultural Assistance Programme
- Weeding
- Harvesting of Crops
- Storage of Food Grains
- Rotation of Crops
- Seed Bank
- Bio-indicators
- Agriculture Research Institutions
- Foliar Sprays
- Bio-control Methods
22 Conservation of Plants and Animals [Revision]
- Deforestation and Its Causes
- Afforestation
- Reforestation
- Causes for Endangerment
- Saving Endangered Species
- Saving Endangered Species
- Government Initiatives to protect Endangered Species
- Conservation of Wildlife
- PBR (People’s Bio-diversity Register)
- Biomagnification
- Animal Welfare Organisations
23 Libre Office Calc [Revision]
- Libre Office Calc
- Spreadsheet
- Worksheet and Workbook
- Merge Cells
- Generate Auto Numbers
- Domain and Range of a Function
- Operators in Libre Office Calc
- Working with Charts
