Class 11 Physics: Units & Measurements
⚡ Topper's Exam Revision Handwritten Notes (NEET | JEE | CBSE) ⚡
1. Chapter Flow & Syllabus Distribution
Part 1: Units & Dimensions (High Part 2: Measurements & Errors
Weightage) • Significant Figures & Rounding Rules
• Physical Quantities (Base vs Derived) • Error Analysis (Absolute / Percentage Error)
• Supplementary Units (2D & 3D Angles) • Accuracy vs Precision
• Systems of Units (FPS, CGS, MKS, SI) (Note: Parallax method removed from latest
• Dimensional Analysis (Direct Numerical NCERT)
Questions)
2. Physical Quantities & Ideal Units
Physical Quantity: Any quantity that can be measured directly or indirectly using an instrument to describe
laws of physics.
Formula: Q=n×u (Numerical Value × Unit)
Quality vs Quantity (Real Life) Ideal Unit Criteria
• Quality: Taste, color, emotions (Cannot be • Well defined & Convenient size
measured ❌) • Constant over time, temperature & pressure
• Quantity: Mass (kg), Length (m), Time (s) • Indestructible & easily reproducible
(Measurable ✔)
3. Classification of Physical Quantities
Type Definition Examples / Formulas
Fundamental Independent quantities serving as basic roots. Mass (kg), Length (m), Time (s)
Speed = Length / Time
Derived Formed by combination of base quantities.
Force = Mass × (Length / Time²)
Supplementary Pure geometric quantities (Dimensionless with Units). Plane Angle (rad), Solid Angle (sr)
4. The 7 Fundamental SI Units
Explore our developer-friendly HTML to PDF API Printed using PDFCrowd HTML to PDF
⚡ Topper's Exam Revision Handwritten Notes (NEET | JEE | CBSE) ⚡
1. Chapter Flow & Syllabus Distribution
Part 1: Units & Dimensions (High Part 2: Measurements & Errors
Weightage) • Significant Figures & Rounding Rules
• Physical Quantities (Base vs Derived) • Error Analysis (Absolute / Percentage Error)
• Supplementary Units (2D & 3D Angles) • Accuracy vs Precision
• Systems of Units (FPS, CGS, MKS, SI) (Note: Parallax method removed from latest
• Dimensional Analysis (Direct Numerical NCERT)
Questions)
2. Physical Quantities & Ideal Units
Physical Quantity: Any quantity that can be measured directly or indirectly using an instrument to describe
laws of physics.
Formula: Q=n×u (Numerical Value × Unit)
Quality vs Quantity (Real Life) Ideal Unit Criteria
• Quality: Taste, color, emotions (Cannot be • Well defined & Convenient size
measured ❌) • Constant over time, temperature & pressure
• Quantity: Mass (kg), Length (m), Time (s) • Indestructible & easily reproducible
(Measurable ✔)
3. Classification of Physical Quantities
Type Definition Examples / Formulas
Fundamental Independent quantities serving as basic roots. Mass (kg), Length (m), Time (s)
Speed = Length / Time
Derived Formed by combination of base quantities.
Force = Mass × (Length / Time²)
Supplementary Pure geometric quantities (Dimensionless with Units). Plane Angle (rad), Solid Angle (sr)
4. The 7 Fundamental SI Units
Explore our developer-friendly HTML to PDF API Printed using PDFCrowd HTML to PDF
