General Science- Samudra Ki Gaharai Mapne Wale Yantra Ka Naam Hai ?

Q.10014: समुद्र की गहराई मापने वाले यंत्र का नाम है ?
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समुद्र की गहराई मापने वाले यंत्र का नाम है ? - What is the name of the ocean depth measuring device? - Samudra Ki Gaharai Mapne Wale Yantra Ka Naam Hai ? General Science in hindi,   Animometer question answers in hindi pdf  Fedometer questions in hindi, Know About hydrometer General Science online test General Science notes in hindi quiz book    hygrometer