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Questions and Answers
What is the thermal resistance of a body a measure of?
What is the thermal resistance of a body a measure of?
- Its ability to retain heat
- Its ability to generate heat
- Its opposition to the flow of heat through it (correct)
- Its ability to conduct heat
What is the significance of the Wiedemann-Franz law?
What is the significance of the Wiedemann-Franz law?
- It states that thermal conductivity is independent of electrical conductivity
- It states that a substance with high thermal conductivity has low electrical conductivity
- It states that electrical conductivity is independent of thermal conductivity
- It states that a substance with high thermal conductivity has high electrical conductivity (correct)
Why are two thin blankets warmer than one blanket of their combined thickness?
Why are two thin blankets warmer than one blanket of their combined thickness?
- The layer of air enclosed in between the two blankets reduces heat flow (correct)
- The layer of air enclosed in between the two blankets increases heat flow
- The two blankets have a lower thermal conductivity than the single blanket
- The two blankets have a higher thermal conductivity than the single blanket
What is the dimension of thermal resistance?
What is the dimension of thermal resistance?
What is the purpose of the gauze in Davy's safety lamp?
What is the purpose of the gauze in Davy's safety lamp?
What is the unit of diffusivity?
What is the unit of diffusivity?
What is the rate of flow of heat called?
What is the rate of flow of heat called?
What is the thermal resistance of a conductor defined as?
What is the thermal resistance of a conductor defined as?
In a series combination of n slabs, what is the equivalent thermal resistance?
In a series combination of n slabs, what is the equivalent thermal resistance?
Why do birds swell their feathers in winter?
Why do birds swell their feathers in winter?
Why do birds feel warmer in winter?
Why do birds feel warmer in winter?
What is the purpose of wire gauze in a Bunsen burner setup?
What is the purpose of wire gauze in a Bunsen burner setup?
Why are cooking utensils provided with wooden handles?
Why are cooking utensils provided with wooden handles?
Why do we feel warmer in a fur coat?
Why do we feel warmer in a fur coat?
What is the condition for steady-state heat flow?
What is the condition for steady-state heat flow?
What is the physical quantity that is proportional to the surface area of a body and its excess temperature over its surroundings?
What is the physical quantity that is proportional to the surface area of a body and its excess temperature over its surroundings?
If K1 and K2 are the thermal conductivities of two slabs of equal area, what is the equivalent thermal conductivity?
If K1 and K2 are the thermal conductivities of two slabs of equal area, what is the equivalent thermal conductivity?
What is the rate of growth of ice in a lake in terms of the thermal conductivity K, temperature θ, and latent heat of fusion L?
What is the rate of growth of ice in a lake in terms of the thermal conductivity K, temperature θ, and latent heat of fusion L?
What is the physical quantity that depends on the properties of a fluid such as density, viscosity, specific heat, and thermal conductivity?
What is the physical quantity that depends on the properties of a fluid such as density, viscosity, specific heat, and thermal conductivity?
What is the physical phenomenon that occurs when the atmospheric temperature drops below 0°C, resulting in the growth of ice on a lake?
What is the physical phenomenon that occurs when the atmospheric temperature drops below 0°C, resulting in the growth of ice on a lake?
What is the ratio of time taken to double and triple the thickness of ice?
What is the ratio of time taken to double and triple the thickness of ice?
What is the primary reason for the decrease in rate of increase of thickness of ice on ponds with time?
What is the primary reason for the decrease in rate of increase of thickness of ice on ponds with time?
In which direction does natural convection take place?
In which direction does natural convection take place?
What is the mode of heat transfer by means of migration of material particles of a medium called?
What is the mode of heat transfer by means of migration of material particles of a medium called?
What is the outcome when heating is done from the base and cooling from the top in natural convection?
What is the outcome when heating is done from the base and cooling from the top in natural convection?
What is the correct expression for the thermal resistance of a composite slab consisting of n slabs of equal length?
What is the correct expression for the thermal resistance of a composite slab consisting of n slabs of equal length?
In a double-walled ice house, what is the primary function of the air enclosed in between the walls?
In a double-walled ice house, what is the primary function of the air enclosed in between the walls?
What is the temperature gradient in a composite bar consisting of two conductors in series, when the heat current is the same in both conductors?
What is the temperature gradient in a composite bar consisting of two conductors in series, when the heat current is the same in both conductors?
What is the relation between the thermal conductivity K and the melted length l in Searle's experiment?
What is the relation between the thermal conductivity K and the melted length l in Searle's experiment?
What is the expression for the heat current in a conductor, when the temperature difference is maintained across a rod of length l and area of cross-section A?
What is the expression for the heat current in a conductor, when the temperature difference is maintained across a rod of length l and area of cross-section A?
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