Question

One litre of water at 20°C is mixed with the same volume of water at 40°C. The temperature of the mixture will be


(a) 60°C (b) between 20°C and 40°C (c) 20°C (d) between 40°C and 60°C​

Answer 1

Answer:

(b) between 20°C and 40°C

Explanation:

When one litre of water at 20 degree Celsius is mixed with one litre of water at 40 degree Celsius. The temperature of the mixture will be in between 20 and 40 degree Celsius. This is because of the first law of thermodynamics.