Question

1 kg = ___________ pounds.
A) 5.121
B) 1.856
C) 2.203
D) 0.547

Answer 1

We know that kg is in the SI system of units whereas a pound is in the FPS system of units.
The pound was given as $1{\text{ }}lb{\text{ }} = {\text{ }}453.59265{\text{ }}g$or $0.45359{\text{ }}kg$ which made the kilogram equivalent to about $2.2046213{\text{ }}lb$.$\;Lb$, is a written abbreviation for pound, when it refers to weight.

Complete step by step answer:
SI unit is defined as the standard reference of the physical quantity which is used for compare the given physical quantity.
There are three systems of units.
F.P.S ( foot-pound-second) system
C.G.S (centimeter-gram- second) system
M.K.S ( meter-kilogram-second) system

$\therefore$ The correct option is (C). That is $1{\text{ }}kg{\text{ }} = {\text{ }}2.203{\text{ }}pounds$.

Additional information
- Physical quantities are those which can be measured and expressed in terms of numerical value.
Physical quantities can be classified into two types:
i) Fundamental physical quantity
ii) Derived physical quantity.
- The physical quantities which are independent of any other quantities are called fundamental physical quantities.
Example: mass, length, time, thermodynamic temperature.
- The physical quantities which can be derived from fundamental quantities are called derived physical quantities.
Example: area, volume, speed, acceleration.
- Applications of dimensional analysis:.
i) Dimensional formulae can be used to convert one system of unit to another system of unit.
ii) Dimensional formulae can be used to check the correctness of a given equation.
iii) Dimensional formulae can be used to derive the relationship among different physical quantities.

Note:
A Few requirements or features of SI units:
i) It should be of suitable size.
ii) It should be well defined.
iii) It should be independent of time, place and other physical conditions like temperature, pressure.
iv) It should be easily reproducible.