Question

S.I unit of weight is kilogram-force $\left( {kgf} \right)$.
A) True
B) False

Answer 1

Hint: To answer this question, we have to know what weight is and how it is related to force. We should try to know all the different units of weight and force. Also, we should know the base units of kilogram-force and what it actually measures.

Complete answer:
To start with this answer we should know a few terms like Force and its S.I unit and weight and its S.I unit and Kilogram-force.
Force: Force can be defined as the external agent which acts on a body to produce a pull or push or can change the shape or size of the body or it can slow down or speed up a moving body or can change the direction of the moving body. The S.I unit of force is $Newton\left( N \right)$.
Weight-The weight of any object can be defined as the force on a body due to the impact of the gravitational pull of the earth or gravity on the object. It is given by
$W = mg$
Where $w$ is the weight of the body which is being considered,
$m$ is the mass of the body which is being considered and
$g$ is the acceleration due to the gravity of the earth.

As it is a type of force, its S.I unit is the same as that of force i.e. $Newton\left( N \right)$.
Kilogram-force $\left( {kgf} \right)$- It can be defined as the gravitational unit of force. When the force due to gravity acts on a body of mass $1Kg$, we call it Kilogram-force.
Thus from the above definition and discussion, we can conclude that the statement given in the question is wrong.

So, the given statement is false.

Note: While solving questions like this, always read the question carefully. Kilogram Force is a unit of force and hence can be a unit of weight. But in the question, the S.I unit is given which is very specific. And we know that S.I units are Standard units used for scientific measurements. So if we are not careful, we can think of the wrong option.