Physics
When you apply mustard oil to your hands, out of the following objects, which object will be difficult for you to hold :
- Earthen cup
- Thermocol tumbler
- Wooden cup
- Glass tumbler
Force
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Answer
Glass tumbler
Reason — When mustard oil is applied on hands, it acts as a lubricant, reducing roughness and making the hands slippery. Also, the friction between glass surfaces and other objects is less because glass is smoother than most materials. So, holding an object with oily hands is very difficult due to reduced friction. Since a glass tumbler itself is also very smooth and slippery, it becomes even harder to grip firmly with oily hands.
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