engineering recuitment BARC Stipendiary Trainee Category II 2023 Mock Test General Knowledge Science Technology and Inventions

प्रत्यक्ष करंट की आवृत्ति________है

1
शून्य
2
50 हर्ट्ज
3
60 हर्ट्ज
4
100 हर्ट्ज
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