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Errors: The difference between standard and experimental values is error. Classification Of Errors: ·                       systematic errors ·                       Random errors Systematic Errors:              The errors to which we can assign a cause usually they follow same trend of variations so a cause can be assigned to them e.g. Errors occurring due to the least count of the measuring instrument. Remedy:              Such errors can be controlled experimentally while carefully monitoring the measurement process. Random Errors:              To which we can’t assign a cause because they do not follow a trend. So these errors are due to unknown causes. Remedy: ...

PHYSICAL QUANTITIES Physics deals with numerous physical quantities in terms of which the laws of physics are expressed. Volume, speed, force, time, mass, density, temperature, electric current e.t.c are few examples of physical quantities. Physical quantities classified into two categories: BASE AND DERIVED QUANTITIES We can define the base quantities as the minimum number of those physical quantities in terms of which other physical quantities can be defined. Derived quantities are those whose definitions are based on other physical quantities, that is, the base quantities. BASE AND DERIVED UNITS Base quantities are said to have base units and derived quantities have derived units. For example, if displacement (length) and time are chosen to be base quantities, then velocity is a derived quantity