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Mulitple Choice Questions

Though the temperature inside lighted electric bulb is around 2700°C, the filament does not burn because _____.

    1. It does not burn in closed system
    2. The oxygen necessary for combustion (and burning) is not available as the bulb is evacuated and filled with pure nitrogen or inert gases
    3. The metal of which it is made is resistant to burning
    4. It is made of non-metallic substance



Topic-Wise MCQs on Sciences