Thermal Conductivity
Physics ⇒ Heat and Thermodynamics
Thermal Conductivity starts at 9 and continues till grade 12.
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See sample questions for grade 11
A copper rod and an iron rod of the same dimensions are heated at one end. Which rod will conduct heat faster and why?
A material has a thermal conductivity of 0.04 W·m-1·K-1. Is it more likely to be a conductor or an insulator?
Define thermal conductivity.
Describe how the structure of a material affects its thermal conductivity.
A metal rod of length 2 m and cross-sectional area 0.01 m2 has a thermal conductivity of 200 W·m-1·K-1. If the temperature difference between its ends is 50 K, calculate the rate of heat transfer through the rod.
A wall is made of two layers: brick (k = 0.6 W·m-1·K-1, thickness = 0.2 m) and wood (k = 0.12 W·m-1·K-1, thickness = 0.1 m). If the temperature difference across the wall is 30 K and the area is 10 m2, calculate the total rate of heat transfer through the wall.
A wall of area 5 m2 and thickness 0.25 m has a thermal conductivity of 0.8 W·m-1·K-1. If the temperature difference across the wall is 20 K, calculate the rate of heat transfer.
A composite bar is made by joining a copper rod (thermal conductivity k1 = 400 W·m-1·K-1, length = 0.5 m) and an aluminum rod (thermal conductivity k2 = 200 W·m-1·K-1, length = 0.5 m) end to end. If the cross-sectional area is 0.01 m2 and the temperature difference across the entire bar is 100 K, calculate the rate of heat transfer through the composite bar.
Which law mathematically describes the rate of heat conduction in a material?
(1) Newton’s Law of Cooling
(2) Stefan-Boltzmann Law
(3) Fourier’s Law
(4) Ohm’s Law
Which of the following has the lowest thermal conductivity?
(1) Water
(2) Air
(3) Iron
(4) Copper
Which of the following is a good thermal insulator?
(1) Silver
(2) Wool
(3) Aluminum
(4) Iron
Which of the following is NOT a factor affecting the rate of heat conduction through a solid?
(1) Thickness of the material
(2) Surface area
(3) Color of the material
(4) Temperature difference
Fill in the blank: The process of heat transfer through a material without any movement of the material as a whole is called ________.
If the cross-sectional area of a rod is doubled, keeping all other factors constant, the rate of heat transfer will ________.
If the thermal conductivity of a material increases, the rate of heat transfer through it will ________.
The rate of heat flow through a slab is directly proportional to the ________ difference across the slab.
True or False: Increasing the thickness of a material increases its thermal conductivity.
True or False: The thermal conductivity of a composite wall is always the average of the conductivities of its components.
True or False: The thermal conductivity of a material is independent of its temperature.
True or False: Thermal conductivity is a vector quantity.
