Q.
Consider the following statements : An ordinary light bulb has a rather short life because the:
I. filament wire is not uniform.
II. bulb cannot be evacuated completely.
III. wires supporting the filament melt at high temperature.
Which of the above statements are correct ?
[A]
I and III
[B]
II and III
[C]
I and II
[D]
I, II and III
Answer & Explanation
Option: [D]