A) 50s
B) 100s
C) 150s
D) 200s
Correct Answer: C
Solution :
Let time taken in boiling the water by the heater is\[t\text{ }s\]. Then \[Q=ms\Delta T\] \[\Rightarrow \] \[\frac{Pt}{J}=ms\Delta T\] \[\therefore \] \[\frac{836}{4.2}t=1\times 1000(40-10)\] \[=\frac{8.36}{4.2}t=1000\times 30\] \[t=\frac{1000\times 30\times 4.2}{836}=150\,s\]You need to login to perform this action.
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