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Q: .......... is used in yellow lamp street lights?
  • A. neon
  • B. nitrogen
  • C. phosphorus
  • D. sodium
Correct Answer: Option D - Sodium is used in yellow lamp street light or sodium vapour lamps. The lamp consists of a U shaped Glass tube, which has two oxide coated tungsten electrodes at the ends and is filled with sodium metal grains and neon gas.
D. Sodium is used in yellow lamp street light or sodium vapour lamps. The lamp consists of a U shaped Glass tube, which has two oxide coated tungsten electrodes at the ends and is filled with sodium metal grains and neon gas.

Explanations:

Sodium is used in yellow lamp street light or sodium vapour lamps. The lamp consists of a U shaped Glass tube, which has two oxide coated tungsten electrodes at the ends and is filled with sodium metal grains and neon gas.