Physics - General Science Objective Questions and Answers for Competitive Exams

Question

After a long period of use, a grey spot develops inside of a bulb. This is because

A Dust inside the bulb condenses on the top
B Glass undergoes a change due to the heat
C The heat of the bulb scorches the glass at the top
D The tungsten filament evaporates and collects there

Answer & Explanation

Answer: Option [A]

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