Question

The SI units of mass and weight are
A. kg and kg
B. N and kg
C. kg and N
C. N and N

Answer 1

Hint:We all know that for measuring a quantity, we need some system of the measurement. The popular methods are the International System (SI), British system and Metric system.

Complete step by step answer:
We know that the mass is the amount of the quantity of matter packed. It is the sum of all the individual components in the body. Mass is the same everywhere, and it has nothing to do with some other gravity field. The mass of a body at earth and the moon is the same.
The weight is the force due to gravity on the body directed towards the centre of the earth. The value depends on the mass, but it also depends upon the acceleration due to gravity which is different for a different planet.
When we talk about the standard international system, we say that the mass of the body is in kilograms. Here the word kilo means 1000 and 1000 grams means 1 kilogram.
The SI unit of mass is kilograms in the international system of measurements.
Since weight is a force and hence its units are Newton in the standard international system.
Therefore, the SI unit of mass and weight are kg and N, respectively, and the correct option is (C).

Note: Suppose there is one body on mass M and if we are asked to calculate its weight in earth and moon then we know that, the value of gravity at the ground is
$g = 9.8\;{\rm{m/}}{{\rm{s}}^{\rm{2}}}$ and the value of gravity at the moon is g/6. We understand that the weight force is W= Ma. Here is the acceleration due to gravity. The value of gravity at the moon is less; the weight of the body at the moon is also less.