Which of the following is NOT an application of Pascal's law ?

Options

A. Hydraulic lift
B. Hydraulic brakes
C. Hydraulic machine
D. Venturimeter

Answer

To solve the question "Which of the following is NOT an application of Pascal's law?", we will analyze each option provided and determine whether it is an application of Pascal's law or not.

### Step-by-Step Solution:

1. **Understanding Pascal's Law**:
- Pascal's law states that when pressure is applied to a confined fluid, the pressure change occurs throughout the fluid in all directions. This principle is the basis for many hydraulic systems.

2. **Analyzing the Options**:
- **Option 1: Hydraulic Lift**
- Hydraulic lifts operate based on Pascal's law. They use a small force applied over a small area to lift a larger weight over a larger area. This is a clear application of Pascal's law.

- **Option 2: Hydraulic Brakes**
- Hydraulic brakes also utilize Pascal's law. When the brake pedal is pressed, pressure is transmitted through the brake fluid to the brake pads, allowing the vehicle to stop. This is another application of Pascal's law.

- **Option 3: Hydraulic Machines**
- Hydraulic machines work on the principle of Pascal's law as well. They use hydraulic fluids to transmit power and perform work, which is consistent with Pascal's principle.

- **Option 4: Venturi Meter**
- A Venturi meter measures fluid flow based on the principle of Bernoulli's theorem, not Pascal's law. It operates by observing the change in pressure as fluid flows through a constricted section of pipe, which is a different principle.

3. **Conclusion**:
- Since options 1, 2, and 3 are all applications of Pascal's law, and option 4 (Venturi meter) is not, we conclude that the answer to the question is **Option 4: Venturi Meter**.

### Final Answer:
**Option 4: Venturi Meter is NOT an application of Pascal's law.**

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