A person has exhaled forcefully. The amount of air present in his lungs is

Options

A. 0 litres
B. 3 litres
C. 1.2 litres
D. 0.5 litres

Answer

To solve the question regarding the amount of air present in a person's lungs after forceful exhalation, we can follow these steps:

### Step-by-Step Solution:

1. **Understanding Lung Capacity**:
- The total lung capacity of a person is approximately 3 liters when fully inhaled.

2. **Exhalation Process**:
- During a normal exhalation, a person can expel about 2 liters of air from their lungs.

3. **Forceful Exhalation**:
- When a person exhales forcefully, they can expel even more air than during a normal exhalation. However, there is always a certain volume of air that remains in the lungs.

4. **Residual Volume**:
- The air that remains in the lungs after a forceful exhalation is known as the "residual volume." This volume is crucial as it prevents the lungs from collapsing.

5. **Value of Residual Volume**:
- The residual volume is typically around 1.2 liters. This means that even after forceful exhalation, there will still be approximately 1.2 liters of air left in the lungs.

6. **Conclusion**:
- Therefore, after a person has exhaled forcefully, the amount of air that remains in the lungs is 1.2 liters.

### Final Answer:
The amount of air present in the lungs after forceful exhalation is **1.2 liters**.

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