A person has applied some mustard oil on his hands. Which of the following objects will become most difficult for him to hold his hand ?

Options

A. Earthen cup (kulhar)
B. thermocal tumbler
C. glass tumbler
D. wooden cup

Answer

To determine which object will be most difficult for a person with mustard oil on their hands to hold, we need to analyze the effect of the oil on friction and the properties of the objects in question.

### Step-by-Step Solution:

1. **Understanding the Effect of Mustard Oil**:
- Mustard oil is a lubricant. When applied to the hands, it reduces the friction between the hands and any object being held.

2. **Identifying the Objects**:
- The objects listed are:
- Earthen cup
- Thermocol tumbler
- Glass tumbler
- Wooden cup

3. **Analyzing the Friction of Each Object**:
- **Earthen Cup**: Generally has a rough surface, which can provide some grip.
- **Thermocol Tumbler**: Lightweight and has a smooth surface, but it is not very slippery.
- **Glass Tumbler**: Smooth and slippery surface, which would be difficult to grip, especially with reduced friction.
- **Wooden Cup**: Typically has a rougher surface than glass, providing better grip than glass.

4. **Comparing the Grip**:
- With mustard oil reducing friction, the smooth surface of the glass tumbler will make it the hardest to hold. The other objects, while they may also be difficult to hold, will not be as challenging as the glass tumbler.

5. **Conclusion**:
- The object that will be most difficult for the person to hold with mustard oil on their hands is the **glass tumbler**.

### Final Answer:
- The glass tumbler will be the most difficult object for the person to hold.