51. Which of the following materials has the highest thermal conductivity?
A) Air
B) Water
C) Copper
D) Glass
52. Which of the following statements is true about thermal radiation?
A) Thermal radiation can only occur in a vacuum
B) Thermal radiation can only occur in solids
C) Thermal radiation can occur through transparent materials
D) Thermal radiation can only occur at extremely high temperatures
53. Which of the following is the formula for calculating the specific heat capacity of a substance?
A) q = mcΔT
B) c = q/mΔT
C) q = cmΔT
D) c = m/qΔT
54. Which of the following statements is true about the boiling point of a substance?
A) The boiling point is the temperature at which a substance freezes
B) The boiling point is the temperature at which a substance melts
C) The boiling point is the temperature at which a substance vaporizes
D) The boiling point is the temperature at which a substance condenses
55. Which of the following statements is true about the heat of fusion of a substance?
A) The heat of fusion is the amount of heat required to melt a substance
B) The heat of fusion is the amount of heat required to vaporize a substance
C) The heat of fusion is the amount of heat released when a substance freezes
D) The heat of fusion is the amount of heat released when a substance vaporizes
