📊 Physics
Q. After long periods of use, a grey spot develops on the inside of a bulb. This is because
  • (A) The tungsten filament evaporates and collects there
  • (B) The heat of the bulb scorches the glass at the top
  • (C) Dust inside the bulb condenses on the top
  • (D) Glass undergoes a change due to the heat
✅ Correct Answer: (C) Dust inside the bulb condenses on the top

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