A cylindrical rod with one end in a steam chamber and outer end in ice results in melting of 0.1 ,,g

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10-1.Thermometry, Thermal Expansion and Calorimetry

normal

A cylindrical rod with one end in a steam chamber and the outer end in ice results in melting of $0.1 \,\,gm$ of ice per second. If the rod is replaced by another with half the length and double the radius of the first and if the thermal conductivity of material of second rod is $1/4$ that of first, the rate at which ice melts is $gm/sec$ will be

$3.2$

$1.6$

$0.2$

$0.1$

Solution

$R=\frac{l}{K A}$

$1$ is halved, $A$ si four times and $\mathrm{K}$ is $\frac{1}{4}$ times.

$\therefore \mathrm{R}$ will become half. Hence, heat current will become two times. Therefore, rate of melting of ice will also become two times or $0.2 g / s$

Standard 11

Physics

Mercury is of ten used in clinical thermometers. Which one of the following properties of mercury is not a reason for this?

normal

(KVPY-2016)

The rods of length $L_1$ and $L_2$ are made of materials whose coefficients of linear expansion are $\alpha _1$ and $\alpha _2$. If the difference between the two lengths is independent of temperatures

normal

The coefficient of apparent expansion of mercury in a glass vessel is $153\times 10^{-6}/\,^oC$ and in a steel vessel is $144\times 10^{-6}/\,^oC.$ If $\alpha $ for steel is $12 \times 10^{-6}/\,^oC,$ then $\alpha $ that of glass is

normal

One kilogram of ice at $0\,^oC$ is mixed with one kilogram of water at $80\,^oC$. Temperature of mixture is …….. $^oC$ (specific heat of water $= 4200\,J\,kg^{-1}\,K^{-1}$ and latent heat of ice $= 336\,KJ \,kg^{-1}$ )

normal

If mass-energy equivalence is taken into account, when water is cooled to from ice. The mass of water should

normal

Solution

Similar Questions

Mercury is of ten used in clinical thermometers. Which one of the following properties of mercury is not a reason for this?

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