railway RRB JE (CBT I + CBT II) Mock Test 2024 Utilization of Electrical Energy Illumination

Choose the correct order of electric discharge lamps in their increasing order of efficiencies (lumens/watt)

1
Sodium vapour lamp, Mercury vapour lamp, Neon lamp
2
Neon lamp, Sodium vapour lamp, Mercury vapour lamp
3
Neon lamp, Mercury vapour, Sodium vapour lamp
4
Mercury vapour lamp, Sodium vapour lamp, Neon lamp
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