On a cold day, it is hard to open the lid of a tight container. But wh – McqOptions

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1.	On a cold day, it is hard to open the lid of a tight container. But when you gently heat the neck you can easily open the lid. Why?
A.	On heating glass expands and lid contracts
B.	Lid expands more than the neck and thus slides easily
C.	Neck becomes slippery on heating
D.	Lids of the bottles cannot bear the heat
Answer» C. Neck becomes slippery on heating

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