OSSC CHSL Syllabus 2026: Prelims & Mains Exam Pattern, Download PDF

Particular

Details

Exam Conducting Body

Odisha Staff Selection Commission (OSSC)

Exam Name

Combined Higher Secondary (10+2) Level Exam

Post Name

Amin, Junior Fisheries Technical Assistant, and Junior Forensic Attendant

Vacancies

124

Selection Process

Prelims, Mains, and Certificate Verification

Maximum Marks

Prelims: 150 marks

Mains: 200 marks

Negative Marking

Yes

Stage

Exam Type

Paper Type

Maximum Marks

Stage-I

Preliminary Examination (OMR/CBRE)

One paper (MCQ)

150

Stage-II

Main Written Examination (OMR/CBRE)

Technical Paper

200

Stage-III

Certificate Verification

-

-

Concepts of Geometry & Mensuration

Introduction to Geometry

2D Shapes: Line, Circle, Triangle, Quadrilateral, Rectangle, Square, Trapezium, Rhombus and Parallelogram

3D Shapes: Sphere, Hemi-Sphere, Cylinder, Cone, Cube, Pyramid, Cuboid Important Theorems and Postulates

Triangles: Different types of Triangles, Various types of Centres, Congruence, Similarity, and Perimeter and Area

Quadrilaterals: Different types of Quadrilaterals i.e. Rectangle, Square, Trapezium, Rhombus and Parallelogram and Perimeter and Area

Circle: Perimeter and Area, Radius, Diameter, Secant, Sector and Chords, and Tangents

Area tracing by using Coordinate Geometry

Height and Distance calculation by using Trigonometric formulae

Volume, Curved Surface Area (CSA), Lateral Surface Area (LSA), Total Surface Area (TSA) of 3D objects i.e. Sphere, Hemi-Sphere, Cylinder, Cone, Cube, Pyramid, Cuboid

Units of area Measurement and their conversion

Interpretation of Maps

Introduction to Maps

Map Scale and Ratio

Coordinates: Latitudes, Longitudes

Types of Maps: Political maps, Physical maps, Topographical maps, Topological maps,

nautical maps, thematic maps and Road maps.

Properties of Maps: Distance, Symbol and Direction.

Conventional Signs and symbols

Interpretation of Topo-Sheets

Index in maps

Topics

Syllabus

Introduction to Inland Fisheries

Unit-1: Introduction to fisheries; importance of fish, present status (global, India and Odisha context). Types of fisheries: freshwater, brackish water, estuaries, riverine, reservoirs, lakes, etc.

Unit-II: Inland fisheries resources, Freshwater resources, Riverine resources, reservoirs, lakes, bheels, wetlands, ponds, tanks and canals. Brackish water resources, lakes, lagoons, estuaries, mudflats, backwaters. Inland fishery resources of Odisha.

Unit-III: Species contributing to inland fisheries: A general account of economically important freshwater and brackish water fin and shell fishes and their distinguishing characters for identification, food and feeding habits, growth, reproduction and migration.

Unit-IV: Fisheries of reservoirs and lakes, conservation of fish stocks, stocking with fish culture and capture management. Floodplain wetlands as capture fishery resources, present status of their exploitation and management. Fisheries resources of Chilika lake and Ansupa.

Unit-V: Coldwater fisheries status, important species, cold water fishery resource management. Fish catching devices, common inland fishery crafts and gears their usefulness, operation, restriction of use, fish aggregating devices.

Introduction to Aquaculture

Unit-I: History of aquaculture, present global and national scenario, principles of aquaculture, Importance of aquaculture, culture practices, conventional monoculture, composite fish culture, mixed culture, integrated aquaculture, criteria for selection of candidate species for aquaculture, sewage fed fisheries, waste water aquaculture. Method of culture: traditional/extensive, semi-intensive, intensive aquaculture in inland water bodies.

Unit-II: Types of fish farms: freshwater/brackish water, type of ponds nursery, rearing, grow-out. Layout design and construction of fish farm. Soil types, properties, classification, sampling methods and texture analysis, effects of seepage and their control, location, design and construction of hatcheries, design and construction of cage and pens for fish culture.

Unit-III: Freshwater aquaculture resources- ponds, tanks, lakes and reservoirs, nursery, rearing and grow out pond preparation and management, control of aquatic weeds, predatory and weed fishes, algal blooms, liming, fertilization/manuring. use of bio- fertilizers, stocking, feeding to fishes, pond environment management, fish health management, harvesting.

Unit IV: Freshwater prawn culture and important species for culture, seed stocking and culture practices, brackish water aquaculture, important finfishes and shellfishes for culture, collection of seed, stocking, important species for culture, seed stocking, culture practices.

Unit-V: Ornamental fish culture, important indigenous and exotic ornamental fishes, preparation of indoor system for culture and their rearing management. Catfish and air breathing fish culture. Important species for culture, seed stocking and culture practices. Integrated aquaculture principle, fish cum poultry, fish-cum-duck culture and fish cum cattle rearing.

Chemistry

Unit 1: Some Basic Concepts of Chemistry

Atomic and molecular masses and equivalent mass of elements, acid, base, and salt, oxidants, reductants, and mole concept and molar mass, percentage composition, empirical and molecular formula, chemical reactions, stoichiometry and calculations based on stoichiometry, expression of concentration of solutions.

Unit II: Structure of Atom

Atomic number, isotopes, Isobars, Rutherford's model and its limitations, Bohr's model and its limitations, concept of shells and subshells, dual nature of matter and light, de Broglie's relationship, Heisenberg uncertainty principle, concept of orbitals, quantum numbers, shapes of s, p and d orbitals, rules for filling electrons in orbitals Auf-Bau principle, Pauli's exclusion principle and Hund's rule, electronic configuration of atoms, stability of half-filled and fully filled orbitals.

Unit III: Classification of Elements and Periodicity in Properties Modern periodic law and the present form of periodic table, periodic trends in properties of elements atomic radii ionic radii, inert gas radii, Ionization enthalpy, electron gain enthalpy, electronegativity, valency and oxidation state. Nomenclature of elements with atomic number greater than 100.

Unit IV: Chemical Bonding and Molecular Structure

Valence electrons, ionic bond, covalent bond; bond parameters. Lewis structure, polar character of covalent bond, covalent character of ionic bond, valence bond theory, resonance, geometry of covalent molecules, VSEPR theory, concept of hybridization, involving s, pand dorbitals and shapes of some molecules, molecular orbital theory of homonuclear diatomic molecules (qualitative idea only), hydrogen bond.

Unit V: States of Matter: Gases and Liquids

Role of gas laws in elucidating the concept of the molecule, Boyle's law. Charles law, Gay Lussac's law, Avogadro's law, ideal behaviour, empirical derivation of gas equation, Avogadro's number, ideal gas equation. Deviation from ideal behaviour liquefaction of gases, critical temperature, kinetic energy and molecular speeds (elementary idea).

Unit VI: Chemical Thermodynamics

Concepts of System and surroundings and types of system, surroundings, work, heat, energy, extensive and intensive properties, state functions. First law of thermodynamics Internal energy and enthalpy. Hess's law of constant heat summation, enthalpy of bond dissociation, combustion, formation, neutralization, atomization, sublimation, phase transition, ionization, solution and dilution, Second law of Thermodynamics (brief introduction). Introduction of entropy as a state function, Gibb's energy change for spontaneous and non-spontaneous processes, criteria for equilibrium. Third law of thermodynamics (Statement only).

Unit VII: Equilibrium

Equlibrium in physical and chemical processes, dynamic nature of equilibrium, law of mass action, equilibrium constant (Kc, Kp and Kx and their relationship), factors affecting equilibrium, Le Chatelier's principle, ionic equilibrium, Ionization of acids and bases, strong and weak electrolytes, degree of ionization, concept of PH, hydrolysis of salts (elementary idea), buffer solution, Henderson Equation, solubility, product, common ion effect (with illustrative examples) numerical problems.

Unit VIII: Redox Reaction

Concept of oxidation and reduction, redox reactions, oxidation number, balancing redox reactions, in terms of loss and gain of electrons and change in oxidation number.

Unit IX: Hydrogen

Position of hydrogen in periodic table, occurrence, isotopes, preparation, properties and uses of hydrogen, hydrides-ionic, covalent and interstitial; physical and chemical properties of water, heavy water and use of hydrogen as a fuel.

Unit X: s-Block Elements (Alkali and Alkaline Earth Metals) 

Group 1 and Group 2 Elements General introduction, electronic configuration, occurrence, anomalous, properties of the first element of each group, diagonal relationship, trends in the variation of properties (such as ionization enthalpy, atomic and Ionic radii), trends in chemical reactivity with oxygen and halogens, uses.

Unit XI: Some p- Block Elements 

General Introduction to p- Block Elements Group 13 Elements: General introduction, electronic configuration, occurrence, variation of properties, oxidation states, trends in chemical reactivity. anomalous properties of first element of the group, Boron physical and

chemical properties.

Group 14 Elements: General introduction, electronic configuration, occurrence, variation of properties, oxidation states, trends in chemical reactivity, anomalous behaviour of first elements. Carbon-catenation, allotropic forms, physical and chemical properties; uses of some important compounds: oxides. Important compounds of Silicon, Silicones, Zeolites and their uses.

Unit XII: Organic Chemistry - Some Basic Principles and Technique General introduction, classification and IUPAC nomenclature of organic compounds. Electronic displacements in a covalent bond, inductive effect, electrometric effect, resonance and hyper conjugation. Homolytic and heterolytic fission of a covalent bond free radicals, carbocations, carbanions, electrophiles and nucleophiles, types of organic reactions.

Unit XIII: Hydrocarbons

Classification of Hydrocarbons

Aliphatic Hydrocarbons:

Alkanes Nomenclature, isomerism, conformation (ethane only), methods of preparation from unsaturated hydrocarbons, alkyl halides, carboxylic acids (Decarboxylation and

Kolbe's electrolytic method), physical properties, chemical reactions: including free radical mechanism of halogenation, combustion, controlled oxidation, isomerisation, aromatisation, with steam and pyrolysis.

Alkenes Nomenclature, structure of double bond (ethene), geometrical isomerism, methods of preparation from alkynes, alkyl halides, vicinal dihalides, alcohols, physical properties, chemical reactions: addition of hydrogen, halogen, water, hydrogen halides, sulphuric acid (Markownikoff's addition and peroxide effect), ozonolysis, oxidation, polymerisation and mechanism of electrophilic addition reaction.

Alkynes Nomenclature, structure of triple bond (ethyne), methods of preparation, from calcium carbide, vicinal dihalides, physical properties, chemical reactions: acidic character of alkynes, addition of hydrogen, halogens, hydrogen halides, water, and polymerisation.

Aromatic Hydrocarbons: Introduction, IUPAC nomenclature, benzene resonance, aromaticity, preparation of benzene from acetylene, phenol and aromatic acids, chemical properties: mechanism of electrophilic substitution, nitration, sulphonation, halogenation, Friedel Craft's alkylation and acylation, addition of hydrogen, addition of chlorine, combustion.

Biology

Unit I: Diversity in living world

Unit II: Structural organization in animals and plants

Unit III: Cell structure and function

Unit IV: Plant physiology

Unit V: Human physiology

Biology 2nd year Science (Theory)

Unit I: Reproduction

Unit II: Genetics and Evolution

Unit III: Biology and Human Welfare

Unit IV: Biotechnology and its applications

Unit V: Ecology and Environment

Subject

Syllabus

Physics

Unit- I: MOTION

Uniform motion & non-uniform motion, Velocity, Acceleration, Distance-Time graph, Velocity- Time graph, Uniform circular motion.

Unit- II: FORCE AND LAWS OF MOTION

Balanced and unbalanced force, Newton's Laws of Motion, Inertia and Mass, Conservation of momentum.

Unit- III: GRAVITATION

Universal laws of gravitation, Free fall, Mass, Weight, Trust and pressure, Pressure in fluids, Buoyancy, Archimedes' Principle, Relative density.

Unit- IV: WORK AND ENERGY

Scientific concepts of work, Forms of energy, Laws of conservation of energy, and Commercial units of energy.

Unit-V: SOUND

Production of Sound, Properties of Sound, Characteristics of sound wave, Speed of sound in different media, Reflection of sound, Echo, Reverberation, Frequency range of hearing, Application of Ultrasound and Sonar.

Unit-VI: LIGHT- REFLECTION AND REFRACTION

Reflection of light, Types of Mirror and utilities, Mirror formula and magnification, Refraction of light, Refractive index, Lens formula and magnification, Power of Lens.

Unit-VII: THERMODYNAMICS

Thermal equilibrium, definition of temperature (Zeroth law of thermodynamics), heat, work, and internal energy. First law of thermodynamics, isothermal and adiabatic processes, second law of thermodynamics, reversible and irreversible processes.

Unit- VIII: ELECTRICITY

Electric current and circuit, Electric potential and potential difference, Circuit diagram, Ohm's law, Factors of resistance, Combination of resistors, Series combination of resistors, Heating effect of electric current, Electric power.

Unit- IX: - MAGNETIC EFFECTS OF ELECTRIC CURRENT

Magnetic field and field lines, Right-hand thumb rule, Fleming's left-hand rule and right hand rule, Electric motor, Electromagnetic induction, Domestic electric circuits, Electric generator.

Chemistry

Unit- I: MATTER

Physical nature of Matter, Characteristics of particles of Matter, State of Matter, Evaporation, Factors affecting evaporation, what is Mixture, Types of mixture, Solution, Properties and concept of solution, Suspension and its properties, Colloidal solution, Properties of colloid, Types of pure substances.

Unit-II: ATOMS AND MOLECULES

Laws of chemical combination, Laws of conservation of mass, Laws of constant proportions, Dalton's Atomic theory, Atom, Atomic mass, Molecule, Ion, Chemical formula and valency, Molecular Mass and Mole.

Unit- III: STRUCTURE OF ATOM

Structure of an Atom, Rutherford's model of Atom, Drawbacks of Rutherford's model of Atom, Bohr's model of Atom, Atomic number and Mass number, Isotope, Isobar.

Unit-IV: CHEMICAL REACTIONS AND EQUATIONS 

Chemical equation, Balanced Chemical equation, Types of Chemical reactions, Double displacement reactions, Oxidation and Reduction, Corrosion and prevention of Corrosion, Rancidity.

Unit- V: ACIDS, BASES AND SALTS

Chemical properties of acids and Bases, pH, Family of salts, Sodium Hydroxide, Bleaching Powder, Baking Soda, Washing Soda, Plaster of Paris.

Unit- VI: METALS AND NON-METALS

Physical properties of Metals, Physical properties of Non-Metals, Chemical properties of Metals, Chemical properties of Non-Metals, Reactivity series, Properties of Iconic compounds, Occurrence of Metals, Extraction of Metals, Enrichment of Ores, Refining of Metals.

Unit- VII: CARBON AND ITS COMPOUNDS

Types of Bonding, Allotropes of Carbon, Versatile nature of Carbon, Chains, branches of Carbon, rings of Carbon, Homologous Series, Nomenclature of Carbon compounds, Chemical properties of Carbon compounds, Combustion, Types of reaction, Properties of Ethanol and Ethanoic Acid, Soaps & Detergents.

Unit- VIII: PERIODIC CLASSIFICATION OF ELEMENTS

Classification of Elements, Dober Einer's Law, Newlands Law of octaves, Mendeleev's Periodic table, Limitations of Mendeleev's classification, The Modern Periodic Table, Metallic and Non-metallic properties of the Modern Periodic Table.

Biology

Unit- I: BIODIVERSITY

Diversity in the living world, Living kingdom, Hierarchy of classification, five kingdom classification, Plantae, Animalia, vertebrata, extinct species, Endangered species.

Unit- II: CELL AND ITS ORGANISATION

Unit of life, Plasma membrane, Nucleus, Chromosome.

Unit- III: TISSUE SYSTEM

Plant tissue, Meristematic tissue, Permanent tissue, Animal tissue, Types of animal tissue, Connective tissue, Muscle tissue, Nervous tissue.

Unit- IV: NUTRITION

Type of Nutrition, Nutrition classification, Photosynthesis, Digestive System of Man.

Unit-V: RESPIRATION

Respiration System, Human Respiratory System.

Unit-VI: TRANSPORTATION AND CIRCULATION

Transport in Plants, Transport in the Human Body.

Unit-VII: EXCRETION

Human excretory system-structure and function, Mechanism of Urine formation, Osmoregulation: Regulation of kidney function.

Unit-VIII: CONTROL AND CO-ORDINATION

Plant control and co-ordination, Human Control and co-ordination, Human Chemical coordination.

Unit- IX: REPRODUCTION

Type of Reproduction of human, Cell Division (Type and Details) of human body, Plant cell Division (Type and Details), Reproductive System of living organism (Type and Details), Male Reproductive System, Female Reproductive System, sexually transmitted diseases, Childbearing and Women's Health.

Unit-X: HEREDITY AND EVOLUTION

Heredity, Mendel's Hybridisation System, Sex Determination, Darwin's Theory, Details on evolution, Human Evolution.

Unit-XI: SOURCES OF ENERGY

Type of energy, Source of energy, Renewable Energy type and work, Renewable noneligible Energy Source.

Unit-XII: ENVIRONMENT

Biosphere, Ecosystem, Structural components of Ecosystem, Functional aspects of Ecosystem and Type, Ecological Pyramid, Nutrient cycle, Biomagnification, Homeostasis, Environmental Problems.

Unit-XIII: CONSERVATION OF NATURAL RESOURCES

Natural Resources, Natural Resources and conservation, Techniques of conservation, Natural Resources importance and Management, Forest and wildlife Conservation, Plant and living being conservation, World Wildlife Fund, Coal and Petroleum conservation, Water Conservation, Watershed Management, Rainwater Harvest, Water Recycle.

Computer

Unit- I: COMPUTER FUNDAMENTALS

Necessity and uses of the computer: What is a computer? Input-Output devices, types of computers (Digital, Analog, Hybrid,Supercomputer, Mainframe, Mini, Notebook, and

Laptop). Generation of Computer, Computer Memory (Main, Secondary, Virtual), Computer Languages. Basic knowledge of MS-Word, MS-Excel, and MS-PowerPoint. Introduction to the Internet, net browsing, Emails, saving, and printing web files.