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प्रश्न
Explain why the surface of mortar and pestle (silbatta) used for grinding is etched again after prolonged use.
स्पष्ट कीजिए
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उत्तर
After prolonged use, the mortar and pestle loose the roughness, due to which frictional force reduces and it does not work properly. So, we have to etch it to make it rough again.
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