SSC Delhi Police MTS (Civilian) Mock Test Series General Knowledge Science Technology and Inventions

थॉमस अल्वा एडीसन ने ______ का आविष्कार किया था। 

1
विदुयत चुम्बक 
2
विद्युत् बल्ब 
3
सर्किट 
4
MCB
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