The rain are in spherical shape due to

Options

A. 1. Viscosity
B. 2. surface tension
C. 3. Thrust on drop
D. 4. Both (a) and (b)

Explanation

### Step-by-Step Solution:

1. **Understanding the Shape of Raindrops**:
- Raindrops are observed to be in a spherical shape when they fall from the sky.

2. **Identifying the Property Involved**:
- The phenomenon that causes raindrops to take a spherical shape is known as **surface tension**.

3. **Explaining Surface Tension**:
- Surface tension is a property of liquids that causes them to behave as if their surface is covered with a stretched elastic membrane. This is due to the cohesive forces between liquid molecules.

4. **Why Spheres Have Minimum Surface Area**:
- When a liquid droplet forms, it tends to minimize its surface area. Among all possible shapes, a sphere has the smallest surface area for a given volume. This is crucial for raindrops as it reduces the energy associated with the surface.

5. **Conclusion**:
- Therefore, due to the effects of surface tension, raindrops adopt a spherical shape to minimize their surface area and energy.

### Final Answer:
The raindrops are in spherical shape due to **surface tension**.

---