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In an electric bulb the filament gets heated to nearly 3400 °C and emits light. Which material is used for this filament?
ACopper
BNichrome
CTungsten
DCarbon
Answer & Solution
Correct answer: C. Tungsten
1. A bulb filament must withstand a very high temperature (about 3400 °C) and glow.
2. The chapter states a tungsten wire is used in an electric bulb for this purpose.
3. The option Nichrome is the heater-coil alloy, used in cookers and heaters, not in bulbs.
_Source: Balbharati (Maharashtra Board) Class 10 Science & Technology, Ch 4 "Effects of Electric Current", p.58_
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