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Question

Which of the following is NOT a fundamental quantity in the SI system?

This question was previously asked in
RRB NTPC 2024 Undergraduate CBT 1 Question Paper (29-Aug-2025) (Shift 1)
The correct answer is

Force

In the SI (International System of Units) system, a fundamental quantity is defined as a physical quantity that cannot be derived from other quantities. The SI system is built on seven fundamental quantities, which form the foundation from which all other measurements are derived. These seven fundamental quantities are:

  • Length (meter)

  • Mass (kilogram)

  • Time (second)

  • Electric current (ampere)

  • Thermodynamic temperature (kelvin)

  • Amount of substance (mole)

  • Luminous intensity (candela)

Given the options and their respective statuses:

  • Amount of substance: This is a fundamental quantity in the SI system.

  • Force: This is a derived quantity, as it is calculated using Newton's second law \( F = ma \), where \( F \) is force, \( m \) is mass, and \( a \) is acceleration.

  • Time: This is a fundamental quantity in the SI system.

  • Luminous intensity: This is a fundamental quantity in the SI system.

From the analysis, the correct answer is Force because it is not a fundamental quantity in the SI system; it is a derived quantity.

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