A metal block A that has been heated to ${40}^{\circ } \mathrm{C}$ is made to touch metal block B that is at a temperature of ${25}^{\circ } \mathrm{C}$. Which of these statements is not true?

Give one advantage and one disadvantage of using alcohol in a thermometer.

In the figure shows a strip made up of brass and iron strips riveted together at both ends. Given that brass expands more than iron on heating, what do you think will happen when this strip is heated?