question_answer 18)

One litre water at \[30{}^\circ C\]is mixed with one litre of water \[50{}^\circ C\]. The temperature of the mixture will be (a) \[80{}^\circ C\] (b) more than \[50{}^\circ C\] but less than \[80{}^\circ C\] (c) \[20{}^\circ C\] (d) between \[30{}^\circ C\]and \[50{}^\circ C\]  

Answer:

(d) Temperature of mixture is in between \[30{}^\circ C\] to \[50{}^\circ C\] because water at \[50{}^\circ C\] losses some heat and water at \[30{}^\circ C\]gains some heat.