A) \[{{0}^{o}}C\]
B) \[-{{5}^{o}}C\]
C) \[-{{10}^{o}}C\]
D) \[-{{15}^{o}}C\]
Correct Answer: C
Solution :
Initial temperature of room \[={{40}^{o}}C\] Given that the temperature lowers at the rate of \[{{5}^{o}}C\] every hour. For 10 hours \[\to 10\times (-{{5}^{o}}C)\]\[=-{{50}^{o}}C\] \[\therefore \]Room temperature 10 hours after the process begins\[={{40}^{o}}C-{{50}^{o}}C=-{{10}^{o}}C\]
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