Thermal Conductivity
Physics ⇒ Heat and Thermodynamics
Thermal Conductivity starts at 9 and continues till grade 12.
QuestionsToday has an evolving set of questions to continuously challenge students so that their knowledge grows in Thermal Conductivity.
How you perform is determined by your score and the time you take.
When you play a quiz, your answers are evaluated in concept instead of actual words and definitions used.
See sample questions for grade 12
A rod is made of two materials, A and B, joined end to end. If kA = 100 W·m-1·K-1 and kB = 50 W·m-1·K-1, and both sections are of equal length and area, which section will have a greater temperature gradient?
Define thermal conductivity and state its SI unit.
Describe the difference between thermal conductivity and heat capacity.
Describe the effect of increasing temperature on the thermal conductivity of metals and non-metals.
A composite wall consists of two layers: Layer 1 has k1 = 0.5 W·m-1·K-1, thickness d1 = 0.1 m; Layer 2 has k2 = 0.2 W·m-1·K-1, thickness d2 = 0.2 m. What is the equivalent thermal conductivity if the layers are in series?
A metal rod of length 2 m and cross-sectional area 0.01 m2 has its ends maintained at 100°C and 0°C. If the thermal conductivity of the rod is 200 W·m-1·K-1, calculate the rate of heat flow.
A refrigerator wall is made of a material with k = 0.04 W·m-1·K-1, thickness 0.05 m, and area 1.5 m2. If the temperature difference across the wall is 20 K, calculate the heat loss per second.
A rod is made of two materials, A and B, joined end to end. If kA = 100 W·m-1·K-1 and kB = 50 W·m-1·K-1, and both sections are of equal length and area, which section will have a greater temperature gradient?
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 thermal conductivity?
(1) Material type
(2) Color of the material
(3) Temperature
(4) Structure of the material
Which of the following is the best explanation for why air is a poor conductor of heat?
(1) Air molecules are tightly packed
(2) Air has free electrons
(3) Air molecules are far apart, so collisions are infrequent
(4) Air is a metal
Which of the following materials has the highest thermal conductivity?
(1) Copper
(2) Glass
(3) Wood
(4) Air
Fill in the blank: Materials with _______ thermal conductivity are used as insulators.
Fill in the blank: The negative sign in Fourier’s law indicates that heat flows from _______ temperature to _______ temperature.
Fill in the blank: The process of heat transfer through a material without the movement of the material as a whole is called _______.
Fill in the blank: The reciprocal of thermal conductivity is called _______ resistance.
True or False: Increasing the thickness of an insulating material increases the rate of heat transfer through it.
True or False: The thermal conductivity of a perfect vacuum is zero.
True or False: The thermal conductivity of diamond is higher than that of copper.
True or False: Thermal conductivity depends on the temperature of the material.
