29) How much heat is absorbed by a copper ingot weighing 400 Kg is heated from 40 Degree C to 72 Degree C for the purpose of forging? (sp.heat of copper is 0.09)

30) What is called for the materials that restricts heat flow by radiation, conduction and convection?

31) Which one is heat insulator?

32) Which one has the highest thermal conductivity?

33) Which one of the following is not a property of heat insulating material?