Q: As per dorry abrasion test, loss in weight is 33 gms, then find the coefficient of hardness. डोरी अपघर्षण परीक्षण के अनुसार, वजन में कमी 33 ग्राम है, तो कठोरता का गुणांक ज्ञात करें।
A.
11
B.
10
C.
9
D.
12
Correct Answer:
Option C -
Explanations:
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