A) \[0.10\text{ }kg/{{m}^{3}}\]
B) \[0.31\text{ }kg/{{m}^{3}}\]
C) \[0.07\text{ }kg/{{m}^{3}}\]
D) \[0.01\text{ }kg/{{m}^{3}}\]
Correct Answer: B
Solution :
| [b]\[\rho =\frac{m}{\text{v}}\] |
| maximum % error in S will be given by |
| \[\frac{\Delta \rho }{\rho }\times 100%=\left( \frac{\Delta m}{m} \right)\times 100%+3\left( \frac{\Delta L}{L} \right)\times 100%\] ...(i) |
| which is only possible when error is small which is not the case in this question. |
| Yet if we apply equation (i), we get |
| \[\Delta \rho =3100kg/{{m}^{3}}\] |
| Now, we will calculate error, without using approximation. |
| \[\rho {{ & }_{\min }}=\frac{{{m}_{\min }}}{{{\text{v}}_{\max }}}=\frac{9.9}{{{(0.11)}^{3}}}=7438kg/{{m}^{3}}\] |
| \[\And \,\rho {{ & }_{\max }}=\frac{{{m}_{\max }}}{{{\text{v}}_{\min }}}=\frac{10.1}{{{(0.09)}^{3}}}=13854.6kg/{{m}^{3}}\] |
| \[\Delta \,\rho =6416.6kg/{{m}^{3}}\] |
| No option is matching. |
| Therefore this question should be awarded bonus |
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