Which of the following are fundamental quantities?

The correct answer is Length & Time.

Key Points

• Fundamental quantities are the physical quantities that cannot be expressed in terms of other quantities and form the basis of measurement.
• The SI system recognizes seven fundamental quantities: Length, Mass, Time, Electric Current, Temperature, Amount of Substance, and Luminous Intensity.
• Length and Time are among the fundamental quantities used in physics and measurement systems.
• Units for Length and Time are meter (m) and second (s), respectively, in the SI system.
• These fundamental quantities are independent and serve as the building blocks for derived quantities such as area, speed, and volume.

Additional Information

• Derived Quantities:
  • Derived quantities are formed by combining fundamental quantities through mathematical operations like multiplication or division.
  • Examples include Area (Length × Length), Speed (Length/Time), and Volume (Length × Length × Length).
• SI Units:
  • The International System of Units (SI) is the globally accepted metric system for measurement.
  • It defines standard units for fundamental quantities such as meter for Length and second for Time.
• Importance of Fundamental Quantities:
  • They provide a universal standard for measuring physical phenomena.
  • These quantities are essential in scientific experiments and engineering applications.
• Dimensional Analysis:
  • Fundamental quantities are used in dimensional analysis to verify equations and ensure consistency in physical calculations.
  • Each quantity is assigned dimensions like [L] for Length and [T] for Time.