question_answer

     

Consider the following statements:

An ordinary light bulb has a rather short life because the:                             [IAS Prelim]

1. filament wire is not uniform.

2. bulb cannot be evacuated completely.

3. wires supporting the filament melt at high temperatures.

Which of the above statements are correct?

A) 1 and 3            

B)      2 and 3

C) 1 and 2            

D)      1, 2 and 3