200 g of hot water at 80°C is added to 400 g of cold water at 10°C. Neglecting the heat taken by the container, calculate the final temperature of the mixture of water. Specific heat capacity of water = 4200 J kg^-1 K^-1.

The temperature of 600 g of cold water rises by 15°C when 300 g of hot water at 50°C is added to it. What was the initial temperature of the cold water?

Heat energy is …………… during melting and it is …………… during freezing at a constant temperature.

1. rejected, absorbed
2. rejected, rejected
3. absorbed, absorbed
4. absorbed, rejected

An increase in pressure results in …………… in melting point of ice :

1. increase
2. no change
3. decrease
4. none of the above