NEET Thermal Properties of Matter PYQ practice sheet

3 previous-year NEET Physics questions from Thermal Properties of Matter, newest papers first. Thermal Properties of Matter carries 4 of the Physics questions in NEET 2020 to 2026, so this is a good place to test yourself after revising the chapter. Marking: +4 correct, −1 wrong.

1. 1.

   RE-NEET 2026

   The temperature of a metallic sphere of radius $R$ is increased by a small amount $\Delta T$. If the linear coefficient of thermal expansion of the metal is $\alpha$, the approximate increase in the volume of the sphere is:

   • (A)
     $3\pi R^3\alpha\Delta T$
   • (B)
     $6\pi R^3\alpha\Delta T$
   • (C)
     $4\pi R^3\alpha\Delta T$
   • (D)
     $2\pi R^3 \alpha\Delta T$
2. 2.

   NEET 2021

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

   • (A)
     $\dfrac{13}{5}t$
   • (B)
     $\dfrac{13}{10}t$
   • (C)
     $\dfrac{5}{13}t$
   • (D)
     $\dfrac{10}{13}t$
3. 3.

   NEET 2020

   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 ratio :

   • (A)
     $\frac{27}{8}$
   • (B)
     $\frac94$
   • (C)
     $\frac32$
   • (D)
     $\frac53$