Class 9th Physics
Chapter No 01
Physical quantities and Measurements
Question No 03
Answer
Physical quantities: Those quantities which are measurable and observable are called physical quantities.
Examples: time, length,mass ,area etc.
Types : The following are the types of physical quantities.
1) Base physical quantities: Those quantities which cannot be obtained from other quantities are called base physical quantities .
Examples: There are seven base physical quantities.
Length ,mass ,time ,temperature, electric current ,amount of substance and luminous intensity(light)
2)Derived physical quantities: Those quantities which are obtained by the product or division or both of two base physical quantities are called derived Physical quantities.
Examples : Area = Length × Width
Area = m×m
Area = m*2
Volume=Length×width×Height= m*3
