Heat Transfer — Prelims Questions

Which of the following statements about heat transfer mechanisms is/are correct? 1. Conduction is the primary mode of heat transfer in fluids. 2. Convection requires a material medium for heat transfer. 3. Radiation can transfer heat through a vacuum. Select the correct answer using the code given below:

Consider the following phenomena: 1. Formation of land and sea breezes 2. Operation of a refrigerator 3. Warming of Earth's atmosphere due to greenhouse gases Which of the above phenomena primarily involve the principle of convection?

Which of the following materials would be most suitable for insulating the walls of a house in a cold climate?

The urban heat island effect is primarily caused by which of the following factors related to heat transfer? 1. High albedo of urban surfaces 2. Increased absorption of solar radiation by dark urban materials 3. Reduced evapotranspiration from vegetation 4. Anthropogenic heat generation from vehicles and industries Select the correct answer using the code given below:

Which of the following statements correctly describes the Stefan-Boltzmann Law in the context of thermal radiation?