engineering recuitment PGCIL Junior Technician Trainee (Electrician) Mock Test 2023 General Knowledge Science Technology and Inventions

प्रकाश बल्ब का तन्तु किसका बना होता है?

1

प्लेटिनम

2

टेंटलम

3

टंगस्टन

4

एन्टिमनी

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