A) \[0.256\,\,g\,\,c{{m}^{-3}}\]
B) \[0.526\,\,g\,\,c{{m}^{-3}}\]
C) \[0.625\,\,g\,\,c{{m}^{-3}}\]
D) \[0.650\,\,g\,\,c{{m}^{-3}}\]
Correct Answer: C
Solution :
Length of wood outside water \[=\frac{3}{8}\times 40=15\,\,cm\] Length of wood inside water\[=40-15=25\,\,cm\] By laws of floatation\[{{h}_{wood}}\times {{d}_{wood}}\] \[={{h}_{water}}\times {{d}_{water}}\], \[h\]and \[d\]stand for height and density \[40\times {{d}_{wood}}=25\times 1\,\,g\,\,c{{m}^{-3}}\]
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