Q. Which of the following metal (shown by its symbol) is generally used for making filaments of bulb?
Answer: W
Notes: Tungsten, a chemical element with symbol W, is used in incandescent light bulb filaments, X-ray tubes (as both the filament and target), electrodes in TIG welding, super-alloys, and radiation shielding. It has the highest melting point of all the elements discovered, melting at 3422 °C (6192 °F, 3695 K). It also has the second highest boiling point, at 5930 °C.