List of top Physics Questions on Calorimetry asked in MHT CET

The length of steel rod is \(5 \text{ cm}\) longer than the copper rod at all temperatures. The length of the steel and copper rod is respectively (\(\alpha_s = 1.1 \times 10^{-5}/^{\circ} \text{C}, \alpha_c = 1.7 \times 10^{-5}/^{\circ} \text{C}\))

The length of steel rod is \(5 \text{ cm}\) longer than the copper rod at all temperatures. The length of the steel and copper rod is respectively (\(\alpha_s = 1.1 \times 10^{-5}/^{\circ} \text{C}, \alpha_c = 1.7 \times 10^{-5}/^{\circ} \text{C}\))

The length of steel rod is \(5 \text{ cm}\) longer than the copper rod at all temperatures. The length of the steel and copper rod is respectively (\(\alpha_s = 1.1 \times 10^{-5}/^{\circ} \text{C}, \alpha_c = 1.7 \times 10^{-5}/^{\circ} \text{C}\))

Rate of flow of heat through a cylindrical rod is \( H_1 \). The temperature of the ends of the rod are ' \( T_1 \) ' and ' \( T_2 \) '. If all the dimensions of the rod become double and the temperature difference remains the same, the rate of flow of heat becomes ' \( H_2 \) '. Then \( H_2 = \)

In a thermodynamic process, there is no exchange of heat between the system and surroundings. Then the thermodynamic process is

A metal rod cools at the rate of $4^\circ\text{C}/\text{min}$ when its temperature is $90^\circ\text{C}$ and the rate of $1^\circ\text{C}/\text{min}$ when its temperature is $30^\circ\text{C}$. The temperature of the surrounding is

If a body cools from $80^{\circ}\text{C}$ to $50^{\circ}\text{C}$ in the room temperature of $25^{\circ}\text{C}$ in 30 minutes, then the temperature of the body after 1 hour is

A sphere, a cube and a thin circular plate all made of same material and having the same mass are heated to same temperature of $200^\circ$C. On these are left in a room.

A sphere and a cube, both of copper have equal volumes and are black. They are allowed to cool at same temperature and in same atmosphere. The ratio of their rate of loss of heat will be