Question

Which of the following group has the correct units of fundamental quantities as per the SI system?
1. meter, kilogram, second, coulomb, Kelvin, mole and candela
2. meter, newton, second, coulomb, Kelvin, mole and candela
3. meter, kilogram, second, ampere, Kelvin, mole and candela
4. meter, kilogram, second, ampere, Kelvin, mole and lux

Answer 1

Correct Answer - Option 3 : meter, kilogram, second, ampere, Kelvin, mole and candela

The correct answer is option 3) i.e. meter, kilogram, second, ampere, kelvin, mole, and candela

CONCEPT:

• The dimensional formula is used to express any physical quantity in terms of fundamental quantities.
• Fundamental quantity: A quantity that can be measured is called a physical quantity. 
  • Fundamental quantities are those which cannot be expressed or measured in terms of other physical quantities. 
• The SI system has seven fundamental quantities i.e. time, length, mass, electric current, thermodynamic temperature, amount of substance, and luminous intensity. 

The seven fundamental quantities along with their dimensions and units are as follows:

Fundamental quantity	Dimension	Unit
Time	T	second (s)
Mass	M	kilogram (kg)
Electric current	A	ampere (A)
Thermodynamic temperature	K	Kelvin (K)
Amount of substance	mol	mole (mol)
Luminous intensity	cd	Candela (cd)
Length	L	meter (m)

EXPLANATION:

• meter, kilogram, second, ampere, Kelvin, mole, and candela are the correct units as per the SI system.