Which SI base unit is paired correctly with its physical quantity?

Which of the following is an SI base quantity?

Which physical quantity has candela as its SI base unit?

Which example shows why old personal units were unreliable?

Which SI base unit is used for amount of substance?

A standard unit is needed mainly to:

Which option contains only SI base units?

Which feature separates a non-physical quantity from a physical quantity?

A derived quantity is one that:

Which of the following pairs contains only physical quantities?

Which of the following is a derived unit?