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Why are the glasses of building milky?

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Why are the glasses of building milky?

(a) Because of unwanted deposits

(b) Because it becomes old

(c) Because it is brittle

(d) Because it changes in properties

This question was addressed to me during an online interview.

This intriguing question originated from Classification of Solids in portion Mechanical Properties of Solids of Engineering Physics I

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The correct answer is (d) Because it changes in properties

To explain: Glasses of the building appear milky because it undergoes heating during the day and cooling during the night. Therefore it acquires some crystalline properties.

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