railway RRB JE (CBT I + CBT II) Mock Test 2024 General Science Physics Measuring Instruments

खालीलपैकी कोणते उपकरण अवरक्त प्रारण मोजते?

1
फेनोग्राफ
2
सौरतामापी
3
ऊर्ध्वतामापी
4
बोलोमीटर 
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