Bernoulli's principle is not involved in the working/explanation of

Options

A. Movement of spinning ball
B. Carburettor of automobile
C. Blades of a kitchen mixer
D. Heart attack

Explanation

To determine which of the given options does not involve Bernoulli's principle, we need to understand what Bernoulli's principle states and how it applies to different scenarios.

### Step-by-Step Solution:

1. **Understanding Bernoulli's Principle**:
- Bernoulli's principle states that in a flowing fluid, an increase in the fluid's velocity occurs simultaneously with a decrease in pressure or potential energy. This principle applies to fluids in motion and is based on the conservation of energy.

2. **Analyzing Each Option**:
- **Option A: Movement of a Spinning Ball**:
- When a ball spins, the air velocity around the ball changes, leading to differences in pressure. This is a classic example of Bernoulli's principle in action.

- **Option B: Carburetor of an Automobile**:
- A carburetor mixes air and fuel by utilizing the principle that as the velocity of the air increases, the pressure decreases, allowing fuel to be drawn into the airstream. This also involves Bernoulli's principle.

- **Option C: Blade of a Kitchen Mixer**:
- The blades of a kitchen mixer rotate due to an external motor. The fluid (ingredients) is mixed due to mechanical action rather than changes in fluid velocity and pressure. This does not involve Bernoulli's principle.

- **Option D: Heart Attack**:
- In the context of blood flow, if the diameter of blood vessels decreases, the velocity of blood increases, leading to a decrease in pressure. This scenario also involves Bernoulli's principle.

3. **Conclusion**:
- From the analysis, the option that does not involve Bernoulli's principle is **Option C: Blade of a Kitchen Mixer**. The operation of the mixer relies on mechanical action rather than fluid dynamics governed by Bernoulli's principle.

### Final Answer:
**The correct option is C: Blade of a Kitchen Mixer.**