railway RRB Group D Mock Test Series 2024-25 General Knowledge Science Technology and Inventions

घर्षण को कम​ करने वाले पदार्थ को _______ कहा जाता हैं।

1
तरल पदार्थ
2
चुंबक
3
स्प्रिंग्स 
4
स्नेहक 
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