A) 30 paise
B) 40 paise
C) 50 paise
D) Rs. 1
Correct Answer: C
Solution :
Volume of bar = Volume of piece of copper \[=1\,\,\,{{m}^{3}}\] length of bar = 36 m \[\therefore \]Area of square cross-section of bar \[=\frac{\text{Volume}}{\text{Length}}=\frac{1}{36}\,\,{{m}^{2}}\] \[\therefore \] Side of square cross-section \[=\sqrt{\frac{1}{36}}=\frac{1}{6}\,\,m\] Volume of exact cube which is cut off from bar \[={{\left( \frac{1}{6} \right)}^{3}}=\frac{1}{6}\times \frac{1}{6}\times \frac{1}{6}=\frac{1}{216}{{m}^{3}}\] Cost of cube = Rs.\[\frac{1}{216}\times 108\]= Rs.\[\frac{1}{2}=50\]paiseYou need to login to perform this action.
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