Brightness of the bulb decreases gradually with its period of use beca – McqOptions

MCQOPTIONS

1.	Brightness of the bulb decreases gradually with its period of use because
A.	Evaporation of metal from filament of bulb
B.	Decrease in resistance of bulb
C.	Decrease in electric supply to the bulb
D.	None of the above
Answer» B. Decrease in resistance of bulb

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