Coefficient of linear expansion of brass and steel rods are ${{\rm{\alpha }}_1}\,{\rm{and}}\,{{\rm{\alpha }}_2}$. Lengths of brass and steel rods are ${l_1}\,{\rm{and}}\,{l_2}$ respectively. If $({l_2}\,{\rm{ - }}\,{l_1})$ is maintained same at all temperatures, which one of the following relations holds good?

Mercury thermometers can be used to measure temperatures upto

If a metal rod experiences a temperature increase, what generally happens to its length?

The length of a metal rod at ${0^0}C$ is $0.5\,m$. When it is heated, its length increases by $2.7\,mm$. The final temperature of rod is $\left[ {\alpha = 90 imes {{10}^{ - 61}}^0C} \right]$

A metal rod of length 'L' is clamped rigidly at its midpoint. If its temperature is increased by $\Delta T$, the longitudinal strain developed in the rod is:

If a copper rod and an aluminum rod experience the same change in length for any given temperature change, and the copper rod's length is 50 cm, what is the length of the aluminum rod? $(\alpha_{Cu} = 1.7 imes 10^{-5} K^{-1}, \alpha_{Al} = 2.2 imes 10^{-5} K^{-1})$

Substance having very small coefficient of linear expansion, among the following is

On the Celsius scale the absolute zero of temperature is at

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 steel tape measures the length of a copper rod as 90.0 cm, when both are at 10$^ \circ C$, the calibration temperature, for the tape. What would be tape read for the length of the rod when both are at 30$^ \circ C$.Given, $\alpha \;$ for steel $\;1.2 imes {10^{ - 5}}^ \circ {C^{ - 1}}\;$ and $\alpha \;$ for copper is $\;1.7 imes {10^{ - 5}}^ \circ {C^{ - 1}}.$

The amount of heat conducted out per second through a window, when inside temperature is ${10^0}C$ and outside temperature is $- {10^0}C$, is 1000 J. Same heat will be conducted in through the window, when outside temperature $- {23^0}C$ and inside temperature is