Question

Which of the following is not a unit of the length?
A) Micron
B) Light year
C) Angstrom
D) Radian

Answer 1

Hint:
Many units we have which are used to find the length or to measure the distance and from the above option we know that radian is used to measure the angle of degree between the two lines.

Complete step-by-step answer:
As we all know that micron is the unit which is used to find the smaller distance between the object.
A light year is the unit to measure the long distance between the objects; this unit is used to measure the distance of the stars from the earth.
Angstrom is the unit to measure the shorter distance. This unit is so small that it is used to measure the wavelength of electromagnetic waves.
In the end we have the option ’radian’.
Radian is the unit which is used to measure the angle between the two lines where.
For relation of radian with degree.
Pie radian is equal to 180 degrees.
$\pi’ = 180^0$
Here “ ‘ “sign denotes the radian

So radian is the degree which is not used to measure the length between the points. Option (D) is the right answer.

Note
1 angstrom is equal to the $ {10}^{-10} $ meter
SI unit to measure the length is meter
Some customary unit of the length is
1 feet = 12 inches
1 yard = 3 feet
Or 1 yard = 36 inches
1 mile = 1760 yards
Or 1 mile = 5280 feet