Question

A) Name the three fundamental physical quantities of measurements in physics and state their SI units of measurements. Give an example in each case.

B) Define Scalar and vector quantities; in each case give an example.

Answer 1

A) there are seven fundamental physical quantity in measurement.

i) mass

unit- kilogram(kg)

example- amount of matter present in the body

ii)

length

unit-meter(m)

example- the distance from the Earth to Sun is 1.49*10¹¹m

iii) time

unit= sec(s)

example- total time of a day is 24hr= 86400sec

iv) temperature

unit- Kelvin(k)

example- the temperature of the sun 5778K

v) amount of substance

unit- mole

vi) electric current

unit- Ampere

vii) luminous of intenticity

unit- candela

B)

Scalar- the physicl quantity which has only magnitude is called a scalar quantity.

Example- speed, distance, work , energy, pressure

Vector- the physical quantity which has both magnitude and direction is called a vector quantity.

Example- velocity, mometum, force, acceleration