A) 2.5 lumen/watt B) 25 lumen/watt C) 250 lumen/watt D) 1500 lumen/watt. Ans : (B)
A) one lumen/sq.m B) one lumen/sq.cm C) one lumen/100 sq.m D) one lumen/1000 sq.m. Ans : (A)
A) 10-2 mm Hg B) 10-3 mm Hg C) 10-4 mm Hg D) 10-5 mm Hg Ans : (C)
A) Blue print machines B) Car lighting C) Aircraft cockpit dashboard lighting D) Medical purposes. Ans : (B)
A) conduction B) convection C) radiation D) none of above. Ans : (C)
A) starter B) power factor improving device C) source of heat D) current limiting device. Ans : (D)
A) Inductance B) Resistance C) Transformer D) Condenser. Ans : (B)
A) glass B) leaf C) copper D) aluminium. Ans : (D)
A) Neon-red B) Magnesium-white C) Carbon dioxide-day light white D) Nitrogen-buff. Ans : (B)
A) Fluorescent lamp B) Filament lamp C) Sodium vapour lamp D) Mercury vapour lamp. Ans : (A)