Download Aptitude Crack
img not found img not found

Heat Transfer

Q1: With increase in porosity, the thermal conductivity of a solid substance

A increases

B decreases

C remains unchanged

D may increase or decrease; depends on the solid

ANS:B - decreases

With an increase in porosity, the thermal conductivity of a solid substance typically decreases. Explanation: Porosity refers to the fraction of void space in a material, which can be filled with air or other gases. When a material has a higher porosity, it contains more voids or empty spaces, which act as insulating barriers to heat transfer. These voids disrupt the pathways for thermal energy to flow through the material, leading to a decrease in thermal conductivity. So, the correct answer is: decreases



img not found
img

For help Students Orientation
Mcqs Questions

One stop destination for examination, preparation, recruitment, and more. Specially designed online test to solve all your preparation worries. Go wherever you want to and practice whenever you want, using the online test platform.