A) \[-\,46{}^\circ C~\]
B) \[-18{}^\circ C\]
C) \[-10{}^\circ C\]
D) \[-25{}^\circ C\]
Correct Answer: C
Solution :
(c) Initial temperature of room\[=40{}^\circ C\]. Given that the temperature lowers at the rate of \[5{}^\circ C\]every hour. For 10 hours \[\to 10\times \left( -5\text{ }{}^\circ C \right)=-\text{ }50\text{ }{}^\circ C.\] So, starting from \[40{}^\circ C,\]temperature comes down to\[40{}^\circ -50{}^\circ C\]\[=-10{}^\circ C\].
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