Question

${10^{ - 3}}\;{\rm{gram}}$ is called the.
(A) kilogram
(B) milligram
(C) decigram
(D) microgram

Answer 1

It is an easy question; here, we can use the basic concept of conversion related to mathematics to determine the correct answer. In the given options, one unit of mass is greater than the gram unit, eliminating that option and focusing on the other option for the correct answer.

Complete step by step answer:

The conversion of $1\;{\rm{kg}}$ is equal to $1000\;{\rm{gram}}$, if we divide the magnitude of $1\;{\rm{gram}}$ by $1000$, then we can obtain the magnitude of the mass in the unit of a milligram, and if we divide the $1\;{\rm{gram}}$ mass by $10$ then we can obtain the magnitude of mass in decigram. Here, magnitude of ${10^{ - 3}}\;{\rm{gram}}$ is given in the question and it is equal to $\dfrac{1}{{1000}}\;{\rm{gram}}$ and we know that $\dfrac{1}{{1000}}\;{\rm{gram}}$ is equal to milligram.
Therefore, ${10^{ - 3}}\;{\rm{gram}}$ is called the milligram and option (B) is correct.

Note: All the units given in the options are measuring units of the mass. Here magnitude of ${10^{ - 3}}\;{\rm{gram}}$ is given in the question, so keep the negative sign of 3 in mind while converting gram into another unit because if we use ${10^3}\;{\rm{gram}}$ in place of ${10^{ - 3}}\;{\rm{gram}}$ during unit conversion, then we will get the answer in the unit of a kilogram.