Which of the following is not a fundamental unit in SI system ?

Options

A. ampere
B. candela
C. kelvin
D. Pascal

Answer

To determine which of the following is not a fundamental unit in the SI system, we need to identify the fundamental units and derived units.

### Step-by-Step Solution:

1. **Identify the Fundamental Units**: The SI system has seven fundamental units:
- Meter (m) for length
- Kilogram (kg) for mass
- Second (s) for time
- Ampere (A) for electric current
- Kelvin (K) for temperature
- Mole (mol) for the amount of substance
- Candela (cd) for luminous intensity

2. **List the Given Options**: The options provided in the question are:
- Option 1: Ampere (A)
- Option 2: Candela (cd)
- Option 3: Kelvin (K)
- Option 4: Pascal (Pa)

3. **Analyze Each Option**:
- **Ampere (A)**: This is the unit of electric current and is a fundamental unit.
- **Candela (cd)**: This is the unit of luminous intensity and is also a fundamental unit.
- **Kelvin (K)**: This is the unit of temperature and is a fundamental unit.
- **Pascal (Pa)**: This is the unit of pressure. Pressure is defined as force per unit area (N/m²), which involves mass, length, and time. Therefore, Pascal is a derived unit, not a fundamental unit.

4. **Conclusion**: Since Pascal is derived from other fundamental units, it is not a fundamental unit in the SI system.

### Final Answer:
The option that is not a fundamental unit in the SI system is **Option 4: Pascal (Pa)**.