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 9
A house has walls made of brick (k = 0.6 W/m·K) and glass wool insulation (k = 0.04 W/m·K). Which material will allow more heat to pass through, assuming equal thickness and area?
A metal rod is heated at one end. After some time, the other end also becomes hot. This is an example of which type of heat transfer?
A wall is made of a material with low thermal conductivity. What is the main advantage of this in a house?
Describe one practical application of a material with high thermal conductivity.
A house has walls made of brick (k = 0.6 W/m·K) and glass wool insulation (k = 0.04 W/m·K). Which material will allow more heat to pass through, assuming equal thickness and area?
A material with a thermal conductivity of 0.1 W/m·K is used to make a wall 0.5 m thick. If the area is 4 m² and the temperature difference is 10 K, calculate the rate of heat transfer.
A metal rod is heated at one end. After some time, the other end also becomes hot. This is an example of which type of heat transfer?
A metal rod of length 1 m and cross-sectional area 0.01 m² has a thermal conductivity of 200 W/m·K. If the temperature difference between its ends is 50 K, calculate the rate of heat transfer.
Thermal conductivity is represented by which symbol?
(1) k
(2) c
(3) t
(4) h
Which of the following has the lowest thermal conductivity?
(1) Water
(2) Air
(3) Iron
(4) Silver
Which of the following is a good example of a thermal insulator?
(1) Steel
(2) Glass wool
(3) Copper
(4) Silver
Which of the following is NOT a factor affecting thermal conductivity?
(1) Material type
(2) Color of the material
(3) Temperature
(4) Structure of the material
Fill in the blank: Materials with low thermal conductivity are called ________.
Fill in the blank: The higher the thermal conductivity of a material, the ________ it transfers heat.
Fill in the blank: The main reason for using insulating materials in building construction is to reduce ________ loss.
Fill in the blank: The process of heat transfer through a material without the movement of the material itself is called ________.
State whether the following statement is true or false: "Thermal conductivity can be negative."
State whether the following statement is true or false: "Thermal conductivity is a property that depends on the amount of material present."
State whether the following statement is true or false: "Thermal conductivity of a material increases with increasing temperature for all materials."
True or False: Air is a good conductor of heat.
