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Wednesday, July 31, 2019
लोहे की सुई पानी की सतह पर तैरती है । इस परिघटना का कारण क्या है ?
(A) श्यानता
(B) पृष्ठ तनाव
(C) गुरुत्वीय त्वरण
(D) इनमें से कोई नहीं
Ans- B
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