Two rods of identical dimensions but different materials, having linear expansion coefficients $\alpha_1$ and $\alpha_2$ ($\alpha_1 > \alpha_2$), are fixed at their ends and subjected to the same temperature increase. If the thermal stress developed in the rods are $\sigma_1$ and $\sigma_2$ respectively, which of the following is correct?

What force should be applied to the ends of steel rod of a cross sectional area 10 cm2 to revent it from elongation when heated from 273K to 303K. \left( {\alpha = 1 imes {{10}^{ - 5}}/{\,^{\,0}}C,y = 2 imes {{10}^{11}}\,w/{m^2}} \right)

A hollow sphere and a solid sphere of the same material and radius are heated to the same temperature. Which sphere will expand more in volume?

Two rods of identical dimensions but different materials, having linear expansion coefficients $\alpha_1$ and $\alpha_2$ ($\alpha_1 > \alpha_2$), are fixed at their ends and subjected to the same temperature increase. If the thermal stress developed in the rods are $\sigma_1$ and $\sigma_2$ respectively, which of the following is correct?

The temperature of a substance increases by ${27^0}C$. On the Kelvin scale this increase is equal to

A metal ball immersed in water weights ${w_1}\;{\rm{at}}\;{0^ \circ }{\rm{C and}}\;{w_2}\;$ at 50$^ \circ C$. The coefficient of cubical expansion of metal is less than that water. Then

A centigrade and a Fahrenheit thermometer are dipped in boiling water. The water temperature is lowered until the Fahrenheit thermometer registers ${140^0}$. What is the fall in temperature as registered by the Centigrade thermometer

Two rods of different materials have coefficients of linear expansion $\alpha_1$ and $\alpha_2$ and initial lengths $l_1$ and $l_2$ at a given temperature. If the difference in their lengths $(l_2 - l_1)$ is to remain constant even with temperature changes, what mathematical relationship must exist between $\alpha_1$, $\alpha_2$, $l_1$, and $l_2$?

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:

On the Celsius scale the absolute zero of temperature is at

A steel bridge is built with expansion joints because: