railway RRB JE (CBT I + CBT II) Mock Test 2024 General Science Physics Heat and Transfer

નીચેનામાંથી કયું અર્ધવાહક નથી?

1
સિલિકોન
2
ક્રિપ્ટોન
3
સેલેનિયમ
4
જર્મેનિયમ
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