Thermal Conductivity
Physics ⇒ Heat and Thermodynamics
Thermal Conductivity starts at 9 and continues till grade 12.
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A steel rod and a copper rod of the same dimensions are heated at one end. Which rod will transfer heat to the other end faster?
A wall is made of two layers: brick (k = 0.6 W·m⁻¹·K⁻¹, thickness = 0.2 m) and insulation (k = 0.04 W·m⁻¹·K⁻¹, thickness = 0.1 m). Which layer offers more resistance to heat flow?
Describe how the thermal conductivity of a material affects its use in everyday life.
Describe one practical application of materials with high thermal conductivity.
A 0.5 m thick wall has an area of 10 m² and a thermal conductivity of 0.2 W·m⁻¹·K⁻¹. If the temperature difference across the wall is 30 K, calculate the rate of heat transfer.
A metal rod of length 2 m and cross-sectional area 0.01 m² has a temperature difference of 50 K between its ends. If the thermal conductivity of the metal is 200 W·m⁻¹·K⁻¹, calculate the rate of heat transfer through the rod.
A steel rod and a copper rod of the same dimensions are heated at one end. Which rod will transfer heat to the other end faster?
A wall is made of two layers: brick (k = 0.6 W·m⁻¹·K⁻¹, thickness = 0.2 m) and insulation (k = 0.04 W·m⁻¹·K⁻¹, thickness = 0.1 m). Which layer offers more resistance to heat flow?
The rate of heat transfer through a material is directly proportional to which of the following?
(1) Length of the material
(2) Area of cross-section
(3) Inverse of temperature difference
(4) Volume of the material
Which of the following is commonly used as a thermal insulator?
(1) Aluminum
(2) Iron
(3) Wool
(4) Silver
Which of the following is NOT a factor affecting the rate of heat conduction through a material?
(1) Thickness of the material
(2) Color of the material
(3) Area of cross-section
(4) Temperature difference across the material
Which of the following is the correct order of thermal conductivity from highest to lowest?
(1) Air, Copper, Glass
(2) Copper, Glass, Air
(3) Glass, Air, Copper
(4) Glass, Copper, Air
Fill in the blank: Materials with ________ thermal conductivity are used as insulators.
Fill in the blank: The formula for the rate of heat transfer by conduction is Q/t = ________ × A × (T₁ - T₂) / d.
Fill in the blank: The lower the thermal conductivity of a material, the ________ it is as an insulator.
Fill in the blank: The process of heat transfer through a material without the movement of the material itself is called ________.
True or False: Increasing the thickness of an insulating material increases its effectiveness.
True or False: Liquids generally have higher thermal conductivity than solids.
True or False: Metals are generally good conductors of heat.
True or False: Silver is the best conductor of heat among all metals.
