railway DFCCIL MTS 2025 Mock Test Series General Knowledge Science Technology and Inventions

खालीलपैकी डायनॅमोचा शोध कोणी लावला?

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माइकल फॅराडे
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एच.डब्ल्यू. सीली
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झेड. जॅन्सन
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डब्ल्यू. स्टर्जन
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