units and measurement

Question 1

what are physical quantities

Answer 1

any quantities that can be measured

Question 2

fundamental/base quantities definition

Answer 2

its indipendent, and other quantities are derived from these quantities. Example - time, distance, mass

Question 3

derived quantities definition

Answer 3

they are derived from fundamental quantitites

Question 4

FUNDAMENTAL UNITS
1)length
2)time
3)mass
4)temperature
5)electric current
6)luminous intensity
7)amount of substance

Answer 4

1)meter
2)second
3)kilogram
4)kelvin
5)ampere
6)candela
7)mole

Question 5

si unit meaning

Answer 5

si unit is called rationalized MKS because it is modified over MKS

Question 6

dimensions meaning

Answer 6

dimonsions of physical quanitity are the exponent to which the base quantity are raised to represent that quantity

Question 7

application of dimensional analysis

Answer 7

1) to check the dimensional correctness of a given physical relation
2) to find dimensional formula of unknown physical quantity
3) to derive the relation difference between physical quantities
4) to convert a physical quantity from one system of units to the other

Question 8

limitation of dimensional analysis

Answer 8

1) this method can only be used if the dependency is of multiplication type
2) the relation derived from this method gives no information about the dimensional constants
3)it gives no information weather a quantity is scaler or vector