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)

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

Exceptional expansion of water happens below _____ $°\mathrm{C}$.

Ice is a _____ conductor of heat.

(Choose from the following: good/poor)

Length of a wire at room temperature is $4.55 \mathrm{m}$. When the temperature increases upto $100 \mathrm{℃}$, then its length becomes $4.57 \mathrm{m}$. The coefficient of linear expansion $\left(\alpha \right)$ of the given wire is

Ratio of linear, area and volume expansion in solids is

A steel wire of uniform cross-section of $1 {\mathrm{mm}}^2$ is heated upto $50°\mathrm{C}$ and clamped rigidly at its ends. If the temperature of wire falls to $40°\mathrm{C},$ change in tension in the wire is (coefficient of linear expansion of steel is $1.1\times {10}^{-5} {}^{\mathrm{o}}\mathrm{C}^{-1}$ and Young's modulus of elasticity of steel is $2\times {10}^{11} \mathrm{N} {\mathrm{m}}^{-2}$)

A metal rod of Young's modulus $Y$ and coefficient of thermal expansion $\alpha$ is held at its two ends such that its length remains invariant. If its temperature is raised by $t°\mathrm{C},$ the linear stress developed in it is

A metal rod of length $L$ and cross-sectional area $A$ is heated through $T °\mathrm{C}.$ What is the force required to prevent the expansion of the rod lengthwise?

A deep pond of water has its top layer frozen during winter. The expected temperature of the water layer at the bottom of the pond is zero degree Celsius.

If there is an increase in the _____ of a solid body due to heating, then the expansion is called cubical expansion.

Water firstly heated from $4 ˚\mathrm{C}$ to $8 ˚\mathrm{C}$, then cooled from $8 ˚\mathrm{C}$ to $0 ˚\mathrm{C}$ and again heated from $0 ˚\mathrm{C}$ to $4 ˚\mathrm{C}$. Here, water will initially expand and lastly contract.

Water firstly heated from $4 °\mathrm{C}$ to $8 °\mathrm{C}$, then cooled from $8 °\mathrm{C}$ to $0 °\mathrm{C}$ and again heated from $0 °\mathrm{C}$ to $4 °\mathrm{C}$. Which of the following is correct?

Select the correct arrangement for the various layer of ice and water in an ice-covered pond.

Exposed water pipes lagged with straw in winter in hilly areas to maintain the water temperature above $4 °\mathrm{C}$.

Why exposed water pipes are lagged with straw in winter in hilly areas?

Gap left between the ends of two railway lines in a railway track is due to compression of solids.

The anomalous expansion of water helps to preserve aquatic life during freezing weather.

The vegetables and fruits get damaged during severe frost because of the water present in them.

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