Need notes for units and dimensions for neet?

Units and Measurements deals with how physical quantities are defined and measured accurately. Physical quantities are expressed as a numerical value multiplied by a unit. These quantities are classified into fundamental quantities (such as length, mass, time, temperature, electric current, luminous intensity, and amount of substance) and derived quantities, which are obtained by combining fundamental ones (like velocity, force, and density). The SI system is the internationally accepted system of units, ensuring uniformity in measurements. Accuracy and precision are important in measurements, and errors may occur due to instrumental, personal, or environmental reasons. These errors can be minimized using proper techniques and are analyzed using absolute, relative, and percentage errors. Significant figures indicate the reliability of a measured value. Dimensional analysis is used to check the correctness of equations, convert units, and derive relationships between physical quantities.