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PYQs/Physics/Thermal Properties of Matter

Physics2019easy

Thermal Properties of Matter

The unit of thermal conductivity is :

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Thermal Properties of Matter

Also in 2019

A copper rod of 88 cm and an aluminium rod of unknown length have their increase in length independent of increase in temperature. The length of aluminium rod is : $(\alpha _{Cu}=1.7\times 10^{-5}K^{-1}$ and $\alpha _{AI}=2.2\times 10^{-5}K^{-1})$

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A metallic bar of Young's modulus, 0.5 x $10^{11}$ $Nm^{-2}$ and coefficient of linear thermal expansion $10^{-5} ^\circ$ $^{-1}$ . Length 1m and area of cross-section $10^{-3}$ $m^2$ is heated from $0^\circ$ C to $100^\circ$ C without expansion or bending. The compressive force developed in it is:

A cup of coffee cools from $90^\circ \text{C}$ to $80^\circ \text{C}$ in t minutes, when the room temperature is $20^\circ \text{C}$ . The time taken by a similar cup of coffee to cool from $80^\circ \text{C}$ to $60^\circ \text{C}$ at a room temperature same at $20^\circ \text{C}$ is

The quantities of heat required to raise the temperature of two solid copper spheres of radii $r_{1}$ and $r_{2}$ ( $r_{1}$ = 1.5 $r_{2}$ ) through 1 K are in the ration:

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