Physics Past Questions and Answers

The statements below were made by some students describing what happened during the determination of the melting point of solids. <br/>i. the temperature of the solid was solid until melting started <br/>ii. the temperature of the solid rose until melting started <br/>iii. during melting, the temperature was rising <br/>iv. during melting, the temperature was constant <br/>v. the temperature continued to rise after all the solid had melted <br/>vi. the temperature stopped rising after all the solid had melted. Which of the following gives correct statements in the right order?

A few grains of table salt were put in a cup of water, kept at constant temperature and left undisturbed. Eventually all the water tasted salty. The action is due to

A temperature 20°C is the same as

The latent heat of fusion of ice is 80cal g<sup style='font-size: smaller;'>-1</sup>. How much heat is required to change 10g of ice at Q<sup style='font-size: smaller;'>o</sup>C into water at the same temperature?

A gas at pressure PNm\(^{-2}\) and temperature 27°C is heated to 77°C at constant volume. The new pressure is