NEET Physics Thermal Properties Of Matter MCQs

A bimetallic strip made of materials X and Y, with linear expansion coefficients $\alpha_X$ and $\alpha_Y$ respectively ($\alpha_X > \alpha_Y$), is fixed at one end. When heated, the strip bends. A small mass 'm' is attached to the free end, producing a bending moment 'M'. If the temperature is further increased by $\Delta T$, and assuming the bending remains elastic, the additional bending moment required to keep the strip straight is:

A solid sphere of radius 'R' made of a material with a volume expansion coefficient '$\gamma$' is heated by $\Delta T$. The fractional change in its moment of inertia about a diameter is:

A pendulum clock keeps correct time at $20^\circ C$. The pendulum is made of a material with a linear expansion coefficient $\alpha$. If the temperature increases to $30^\circ C$, how much time will the clock gain or lose in one day?

A metal rod of length $L$ at temperature $T_1$ is heated to a temperature $T_2$. The coefficient of linear expansion of the metal is $\alpha$. The rod is then constrained from expanding lengthwise. What is the thermal stress developed in the rod?

A bimetallic strip made of materials A and B, with linear expansion coefficients $\alpha_A$ and $\alpha_B$ respectively ($\alpha_A > \alpha_B$), is fixed at one end. When the temperature increases, which way will the strip bend?

A metal rod of length $L$ at temperature $T_1$ is heated to a temperature $T_2$. If the linear expansivity of the metal is $\alpha$, the increase in length of the rod is given by:

Two rods of different materials but of the same length and cross-sectional area are heated through the same temperature difference. If their linear expansivities are $\alpha_1$ and $\alpha_2$ respectively, the difference in their elongation is:

Which of the following is the correct relationship between linear expansivity ($\alpha$), superficial expansivity ($\beta$), and cubical expansivity ($\gamma$)?

A bimetallic strip is made of two metals with different linear expansivities. When heated, the strip bends because:

A steel bridge is built with expansion joints because: