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Physics - General Science Objective Questions and Answers for Competitive Exams

Q.

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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