A) Gas discharge B) Chemical combustion C) Nuclear fusion D) Joule heating
A) To increase brightness B) To prevent oxidation C) To cool the filament D) To generate electricity
A) Around 15% B) Less than 5% C) More than 50% D) About 25%
A) Joseph Swan B) Humphry Davy C) James Bowman Lindsay D) Thomas Edison
A) It required toxic gases B) It frequently caused electrical fires C) It was too expensive to produce D) It was not bright or long-lasting
A) 1860 B) 1802 C) 1880 D) 1840
A) Creating a better glass seal B) Using phosphorus vapors as a getter C) Using tungsten filaments D) Using neon gas for illumination
A) Tungsten metal B) Carbonized Japanese bamboo C) Platinum wire D) Cotton thread
A) Royal Institution B) Mosley Street Opera House C) Château de Blois D) Savoy Theatre
A) They required specialized glass B) They were too bright and emitted carbon monoxide C) They required too little electricity D) They were too fragile
A) Frederick de Moleyns B) Joseph Swan C) Alexander Lodygin D) Thomas Edison
A) Titanic B) Savoy C) Jumbo D) Columbia
A) Tungsten strip B) Carbon rod C) Platinum wire D) A ceramic globar
A) With improved vacuum pump processing B) By using a platinum filament C) By using a thicker glass bulb D) By adding nitrogen gas
A) 16 lm/W B) 60 lm/W C) 100 lm/W D) 13 lm/W |