unit 1 Physics 1 Marks 1. Define physical quantity. A physical quantity is a property of a material or a system that can be measured, such as length, mass, time, or temperature. 2. Define fundamental physical quantity. A fundamental physical quantity is a physical quantity that cannot be expressed in terms of other physical quantities. Examples include length (meter), mass (kilogram), and time (second). 3. Define derived physical quantity. A derived physical quantity is a physical quantity that is expressed in terms of one or more fundamental physical quantities. Examples include area (length2), velocity (length/time), and density (mass/volume). 4. Define unit. A unit is a standard measure used to express a physical quantity. For example, the meter is the unit of length, and the kilogram is the unit of mass. 5. Define dimensions. The dimensions of a physical quantity are the powers to which the fundamental quantities (like mass, length, and time) must be raised to represent that quanti...
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