Class 11 Physics — Chapter 1: Units &
Measurements
1. Physical Quantity
Jo quantity measure kiti ja sake oh Physical quantity hundi hai.
Types: Fundamental quantities, Derived quantities.
2. SI Base Quantities
Quantity Unit Symbol
Length metre m
Mass kilogram kg
Time second s
Electric current ampere A
Temperature kelvin K
Amount of substance mole mol
Luminous intensity candela cd
3. Derived Units
1 Velocity = m/s
2 Acceleration = m/s²
3 Force = newton (kg·m/s²)
4 Density = kg/m³
4. Dimensional Formula
Quantity Dimensional Formula
Velocity [M■L¹T■¹]
Acceleration [M■L¹T■²]
Force [M¹L¹T■²]
Energy [M¹L²T■²]
5. Significant Figures
1 Non-zero digits significant
2 Zeros between digits significant
3 Leading zero not significant
Measurements
1. Physical Quantity
Jo quantity measure kiti ja sake oh Physical quantity hundi hai.
Types: Fundamental quantities, Derived quantities.
2. SI Base Quantities
Quantity Unit Symbol
Length metre m
Mass kilogram kg
Time second s
Electric current ampere A
Temperature kelvin K
Amount of substance mole mol
Luminous intensity candela cd
3. Derived Units
1 Velocity = m/s
2 Acceleration = m/s²
3 Force = newton (kg·m/s²)
4 Density = kg/m³
4. Dimensional Formula
Quantity Dimensional Formula
Velocity [M■L¹T■¹]
Acceleration [M■L¹T■²]
Force [M¹L¹T■²]
Energy [M¹L²T■²]
5. Significant Figures
1 Non-zero digits significant
2 Zeros between digits significant
3 Leading zero not significant
