How many fundamental units are present in the SI system of units ?

Options

A. 5
B. 6
C. 7
D. 3

Answer

To determine how many fundamental units are present in the SI system of units, we can follow these steps:

### Step-by-Step Solution:

1. **Understand the Concept of Fundamental Units**:
- Fundamental units are the basic units of measurement in the SI system from which other units can be derived.

2. **Identify the Fundamental Units in the SI System**:
- The SI system consists of seven fundamental units. These units correspond to seven fundamental physical quantities.

3. **List the Seven Fundamental Units**:
- **Length**: The unit is meter (m).
- **Mass**: The unit is kilogram (kg).
- **Time**: The unit is second (s).
- **Electric Current**: The unit is ampere (A).
- **Temperature**: The unit is kelvin (K).
- **Luminous Intensity**: The unit is candela (Cd).
- **Amount of Substance**: The unit is mole (mol).

4. **Conclusion**:
- Therefore, the total number of fundamental units in the SI system is **7**.

### Final Answer:
There are **7 fundamental units** in the SI system of units.

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