defence exam Indian Navy Fireman/Fire Engine Driver Mock Test 2024 General Knowledge Science Technology and Inventions

એક્સ-રેના શોધક કોણ હતા?

1
આલ્બર્ટ આઈન્સ્ટાઈન
2
ડબલ્યુએચ બ્રેગ
3
WC Roentgen
4
હેનરી બેકરેલ
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