Question

In S.I. system, there is one unit for one physical quantity. So system is called *
(a) coherent
(b) metric
(c) rational
(d) closely related to cgs system

please tell me Answer
it's urgent​

Answer 1

Given : In S.I. system, there is one unit for one physical quantity

To Find :  So system is called

(a) coherent

(b) metric

(c) rational

(d) closely related to cgs system​

Solution:

In S.I. system, there is one unit for one physical quantity so system is called

coherent

coherent  means logical and clear without any ambiguity

option (a) coherent  is correct

It comprises a coherent system of units of measurement starting with seven base units and 22 Derived units ( coherent)

Every physical quantity has exactly one coherent SI unit, although this unit may be expressible in different forms by using some of the special names and symbols

second (the unit of time with the symbol s),

metre (length, m),

kilogram (mass, kg),    ( it is an exception having k with gram )

ampere (electric current, A),

kelvin (thermodynamic temperature, K),

mole (amount of substance, mol), and

candela (luminous intensity, cd).

SI  - abbreviated from the French Système international (d'unités)

International System of Units

This is metric System of units

it is  a unified and rational system of measures

it can be related to cgs system by conversion.

The system allows for an unlimited number of additional units,

called derived units, which can always be represented as products of powers of the base units

In S.I. system, there is one unit for one physical quantity. So system is called (a) coherent

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