OSSC CHSL Syllabus and Exam Pattern 2025

Candidates are required to go through the syllabus and exam pattern if they wish to go for the exam. And for that, you can look at the provided information.

Preliminary Exam Syllabus

Subjects	Topics
Reasoning Ability	Analogies Judgment Arithmetical Reasoning Semantic Analogy Semantic Series Numerical Operations Drawing Inferences Classification of center codes/roll numbers Similarities & Differences Decision Making Figural Classification Symbolic/Number Analogy Number Series Symbolic Operations
Data Interpretation	Chart Graph Data Sufficiency Table
General Awareness	Sports History (Ancient, Medieval, and Modern) Culture Geography Economic Scene General Polity Indian Constitution Scientific Research Current Affairs
Computer & Internet Awareness	MS-Word MS-Excel Basic Knowledge of computer

OSSC CHSL Mains Examination Syllabus

Subjects	Topics
Yarn Manufacture	Objectives and Mechanism of Ginning, Carding, Drawing, Doubling. Drafting, Combing, and Compact Spinning Machineries used and their functions, maintenance of machinery, and Yarn defects with remedial measures.
Fabric Manufacture	Objectives of Warp & Weft Winding. Types, Features & Mechanism of different Winding Machines, Fabric Defects and remedial measures. Sizing, Parts of different looms, and their functions with working principle. Fabric Designs, Drafting, Lifting, and Denting.
Textile Chemical Processing	Objectives of various pre-treatments like singing, De sizing, Scouring, Souring, Bleaching, Mercerising, and their Methodologies using different types of machinery. Classification of Dyestuffs. Dyeing & Printing. Dyeing Recipes, Working principles of Dyeing Machineries. Colour Fastness, Printing Pastes. Different Finishes like Calendaring, Heat Setting, Anti Crease, Water Proof, Flame-Retardant, Softening, Stiffening, Moth Proof, Optical Whitening, Antimicrobial.
Textile Testing	Factors Influencing Testing of Fibre, Yarn, and Fabric. Fibre. Yarn and Fabric Quality. Principle of Testing. Air and water Permeability, Tensile, Tearing, Bursting Strength, Evenness, Fibre Maturity, Impurities, Abrasion Resistance, and Pilling. Machinery used in Textile Testing and their functions.