Explain the statement: “The coefficient of linear expansion of iron is 12 × 10⁻⁶ /°C”. Give an example of volume expansion of a liquid due to the application of heat. [2+1]

Define Thermal conductivity. What is the SI unit of Thermal resistance? [2 + 1] OR Define volume expansion coefficient of a gas. Find its value from Charles's law. [1 + 2]

Define the coefficient of volume expansion of a solid and write its mathematical form. [1 + 2] OR Give one example of each of the thermal expansion of solid, liquid and gaseous substances from everyday experience. [1 + 1 + 1]

Find the length of an iron rod at 110°C if at 10°C, the length of the rod is 20 cm. [Volume expansion coefficient of iron = 36 × 10⁻⁶ /°C]

How many types of thermal expansion coefficients are there for a liquid? 0 1 2 3

The coefficient of thermal conduction depends on: (a) The difference in temperature between the two ends of the conductor (b) Property of the material of the conductor (c) The length of the conductor (d) The area of cross-section of the conductor

The SI unit of thermal conductivity is: (a) W m⁻¹ K⁻¹ (b) cal m⁻¹ °C⁻¹ (c) W m K⁻¹ (d) W m² K⁻¹

State whether the following statement is true or false: The real expansion of a liquid depends on the expansion of the vessel in which the liquid is kept.

If the length and cross-sectional area of a conductor remain unchanged, what is the relationship between the thermal resistance and thermal conductivity of that conductor?

Why are there gaps at regular intervals between consecutive rails in a railway track? State the relation between linear expansion coefficient (α), superficial expansion coefficient (β) and volume expansion coefficient (γ). [2+1]

Write whether the following statement is true or false : The value of coefficient of linear expansion of solid is the same in celsius scale and in Kelvin scale. OR Arrange diamond, iron and silver in the order of decreasing thermal conductivity.

What is the unit of conductivity? mho. meter -1 ohm. meter -1 mho. meter ohm. meter