Written By Pankaj Sir Jan 20, 2026 0 comment Welcome to your UPSC Prelims Quize 1. Which one of the following laser types is used in a laser printer? (UPSC Prelims 2008) a) Dye laser b) Gas laser c) Semiconductor laser d) Excimer laser None None Time's up Pankaj Sir EX-IRS (UPSC AIR 196)
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