A person has applied some mustard oil on his hands. Which of the following objects will become most difficult for him to hold in his hand?
(a) Earthen cup (kulhar)
(b) thermocol tumbler
(c) glass tumbler
(d) wooden cup
Glass tumbler offers the least friction and in addition, mustard oil also reduces the friction. So, a glass tumbler will be most difficult for the person to hold in his hand.
So, option (c) is correct.
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