For which of the given is luminous efficiency maximum ?
For which of the given is luminous efficiency maximum ?

Q. For which of the given is luminous efficiency maximum ?

A.            Sodium vapour lamp

B.            Mercury vapour lamp

C.            Arc lamp

D.            Tungsten filament lamp

Answer: Sodium vapour lamp
Gkseries: Gkseries.com is a premier website to provide complete solution for online preparation of different competitive exams like UPSC, SBI PO, SBI clerical, PCS, IPS, IAS, IBPS PO, IBPS Clerical exam etc. & other graduate and post-graduate exams. Learn more on about us page