A) 82 minutes
B) 50 minutes
C) 28 minutes
D) 37 minutes
Correct Answer: C
Solution :
[c] Heat required to boil water \[=mc\Delta q\] \[=2\times 4200\times (100-20)\] \[=6.72\times {{10}^{3}}\,J\] If t be the time of boil then \[\eta \times 500\times t=6.72\times {{10}^{3}}\] or \[t=\frac{6.72\times {{10}^{3}}}{0.8\times 500}=28\,\text{minutes}\text{.}\]You need to login to perform this action.
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