Which of the following system of units is not based on units of mass, length and time alone?

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Accepted Answer

1. **Analyze the Systems:**
   - **CGS:** Based on Centimetre (Length), Gram (Mass), and Second (Time) .
   - **FPS:** Based on Foot (Length), Pound (Mass), and Second (Time) .
   - **MKS:** Based on Metre (Length), Kilogram (Mass), and Second (Time) .
   - **SI:** The International System of Units is based on **seven** base units. Besides units for length, mass, and time, it includes units for electric current (ampere), thermodynamic temperature (kelvin), amount of substance (mole), and luminous intensity (candela) .
2. **Conclusion:** The SI system is not based on mass, length, and time alone, as it incorporates electromagnetic, thermodynamic, and other physical quantities defined by seven fundamental units.

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