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Q:

पदार्थों की कठोरता को मापने के साधन को कहा जाता हैं 

  • 1
    ल्युसीमीटर
  • 2
    सेरौनोग्राफ
  • 3
    ड्यूरोमीटर
  • 4
    हाइग्रोमीटर
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Answer : 3. "ड्यूरोमीटर"
Explanation :

Durometer. Notes: A durometer is an instrument for testing the hardness of various substances. The term is often used to refer to the measurement as well as the instrument itself. Higher numbers indicate harder materials; lower numbers indicate softer materials.

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