Which of the following physical quantities has same unit in all the three system of units?

Options

A. mass
B. lenth
C. time
D. none of these

Explanation

To solve the question of which physical quantity has the same unit in all three systems of units (FPS, CGS, and MKS), we can follow these steps:

### Step-by-Step Solution:

1. **Identify the Three Systems of Units**:
- The three systems of units we are considering are:
- FPS (Foot-Pound-Second)
- CGS (Centimeter-Gram-Second)
- MKS (Meter-Kilogram-Second)

2. **List the Units for Each Quantity**:
- For **Length**:
- FPS: Foot (ft)
- CGS: Centimeter (cm)
- MKS: Meter (m)
- For **Mass**:
- FPS: Pound (lb)
- CGS: Gram (g)
- MKS: Kilogram (kg)
- For **Time**:
- FPS: Second (s)
- CGS: Second (s)
- MKS: Second (s)

3. **Compare the Units Across the Systems**:
- **Length**:
- Different units in each system (foot, centimeter, meter).
- **Mass**:
- Different units in each system (pound, gram, kilogram).
- **Time**:
- Same unit in all systems (second).

4. **Conclusion**:
- The only physical quantity that has the same unit across all three systems (FPS, CGS, and MKS) is **Time**, which is measured in seconds.

5. **Final Answer**:
- Therefore, the answer to the question is **Option C: Time**.