Exercise-1

A hot liquid is kept in a big room. Its temperature is plotted as a function of time. Which of the following curves may represent the plot?

A body takes $4$ minutes to cool from $100°\mathrm{C}$ to $70°\mathrm{C}.$ To cool from $70°\mathrm{C}$ to $40°\mathrm{C}$ it will take-(room temperature is $15°\mathrm{C}$)

A hot liquid cools from $70°\mathrm{C}$ to $60°\mathrm{C}$ in $5$ minutes. The time needed by same liquid to cool from $60°\mathrm{C}$ to $50°\mathrm{C}$ will be-

Which of the following is true statement?

A body takes $10$ minutes to cool down from $62°\mathrm{C}$ to $50°\mathrm{C}.$ If the temperature of surrounding is $26°\mathrm{C}$ then in the next $10$ minutes temperature of the body will be:

Two circular discs $A$ and $B$ with equal radii are blackened. They are heated to the same temperature and are cooled under identical conditions. What inference do you draw from their cooling curves?

A liquid cools down from $70°\mathrm{C}$ to $60°\mathrm{C}$ in $5 \min .$ The time taken to cool it from $60°\mathrm{C}$ to $50°\mathrm{C}$ will be

The heat capacities of three liquids $A, B$ and $C$ of same volumes are in the ratio $3 : 2 : 1.$ They are allowed to cool in the same surroundings and in same conditions for the same temperature difference. Which of these will cool first?