A) 12.6 min
B) 12.8 min
C) 6.3 min
D) 6.4 min
Correct Answer: C
Solution :
Heat required,\[Q=1000\times 1\times \left( 100-20 \right)\] \[=1000\,\,\times \,\,80\,\text{cal}\] Heat produced in time t is, \[H=Vlt\] \[=220\times 4\times t\,\,J\] \[=\frac{220\times 4\times t}{4.18}\,\text{cal}\] \[\therefore \] \[=\frac{220\times 4\times t}{4.18}=1000\times 80\] \[\Rightarrow \] \[t=\frac{1000\times 80}{4.18\times 220\times 4}=6.3\,\min \]You need to login to perform this action.
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