engineering recuitment HAL Management & Design Trainee Mock Test 2023 Electronic Mechanic Electronic Devices and Circuits Opto Electronic Components

सौर सेल में किस पदार्थ का उपयोग किया जाता है?  

1
सिलिकॉन
2
तांबा 
3
एंटीमनी 
4
फास्फोरस 
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