Thermal Expansion

A wire is made by attaching two segments together end to end. One segment is made of aluminium and the other is steel. The effective coefficient of linear expansion of the two segment wire is $19\times {10}^{-6} °{\mathrm{C}}^{-1}$. The fraction length of aluminium is $\frac{x}{11}$ then find $x$. (linear coefficients of thermal expansion of aluminium and steel are $23\times {10}^{-6} °{\mathrm{C}}^{-1}$ and $12\times {10}^{-6} °{\mathrm{C}}^{-1}$ respectively)

Mention some applications of thermal expansion in solids.

Which of these materials shows rapid expansion on heating

During thermal expansion of solids the molecules of solids get bigger and thus expansion of solids is higher compared to liquids and gases. 

Most matter contracts on heating and expands on cooling (Yes\No).

An iron plate is uniformly heated from $20°\mathrm{C}$ to $80°\mathrm{C}$. The change in diameter of a circular hole of diameter $1\mathrm{m}$ is $\frac{\mathrm{x}}{100}\mathrm{cm}$. Find the value of $\mathrm{x}$. $\left(\alpha =12\times {10}^{-6}/°\mathrm{C}\right)$

The water pipes burst because the water inside them is expanding when it undergoes _____.

_____is an expansion when a solid is heated and there is a change in its volume.

A hole is drilled in a copper sheet. The diameter of the hole is $4.24 \mathrm{cm}$ at $27°\mathrm{C}$. What is the change in the diameter (in $\mathrm{cm}$) of the hole when the sheet is heated to $227°\mathrm{C}$ ? Coefficient of linear expansion of copper is $1.70\times {10}^{-5} °{\mathrm{C}}^{-1}$.

A non-isotropic solid metal cube has coefficients of linear expansion as: $5\times {10}^{-5}/{}^{\text{o}}\text{C}$ along the x-axis and $5\times {10}^{-6}/{}^{\text{o}}\text{C}$ along the y and the z-axis. If the coefficient of volume expansion of the solid is $\text{C}\times {10}^{-6}/{}^{\text{o}}\text{C}$ then the value of $\mathrm{C}$ is _____________

A large steel wheel is to be fitted on a shaft of the same material. At 27^oC, the outer diameter of the shaft is 8.70 cm and the diameter of the central hole in the wheel is 8.69 cm. The shaft is cooled using dry ice. At what temperature (in $°\mathrm{C}$) (to the nearest integer) of the shaft does the wheel slip on the shaft? Assume the coefficient of linear expansion of the steel to be constant over the required temperature range.

[${\alpha }_{\text{steel}}=1\text{.}20\times 10^{-5}/\text{K}$]

When heat is supplied to a material, its dimension gets changed.

Thermal expansion is the most in gases.

Select the correct statement.

Name the silver coloured liquid which is used in thermometer​.

What physical change is observed in a solid when it is heated?

(Chose from the following: Contraction, Expansion)

A pendulum clock (fitted with a small heavy bob that is connected with a metal rod) is $5 \mathrm{s}$  fast each day at a temperature of $15°\mathrm{C}$  and $10$ seconds slow at a temperature of $30°\mathrm{C}$. The temperature at which it is designed to give correct time, is

When fully inflated balloon is immersed in cold water, it will contract.

Ethyl alcohol expands less than mercury for the same rise in temperature.

The coefficient of linear expansion for brass is 0.000019 ^oC^-1.A clock, which has a pendulum made of brass keeps correct time at 25^oC.How many seconds a day will it gain if the ambient temperature falls to 0^oC ?