Which of the following is a base unit in the SI system? (2020)

Which of the following is a base unit in the SI system? (2020)

Step 1: Understand what the SI system is. The SI system (International System of Units) is a system of measurement used worldwide.
Step 2: Learn about base units. Base units are the fundamental units in the SI system from which other units are derived.
Step 3: Identify the base units in the SI system. The base units include meter (for length), kilogram (for mass), second (for time), ampere (for electric current), kelvin (for temperature), mole (for amount of substance), and candela (for luminous intensity).
Step 4: Recognize derived units. Derived units are formed from base units. Examples include liter (volume), newton (force), and joule (energy).
Step 5: Compare the options given in the question. Identify which one is a base unit and which ones are derived units.
Step 6: Conclude that meter is a base unit in the SI system, while liter, newton, and joule are derived units.

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