state gov DDA Patwari Test Series General Knowledge Science Technology and Inventions

पॉवरलूमचा शोध कोणी लावला?

1
हेन्री बेकरेल
2
एडमंड कार्टराईट
3
अलेक्झांडर फ्लेमिंग
4
जेम्स चॅडविक
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