Civil Services JPSC Civil Services Prelims Mock Test 2024 General Knowledge Science Technology and Inventions

मोबाईल फोन चार्जर आहे -

1
एक इन्व्हर्टर
2
एक UPS
3
एक स्टेप-डाउन ट्रान्सफॉर्मर
4
एक स्टेप-अप ट्रान्सफॉर्मर
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