### Physics 9 Chapter 8 - Thermal Properties of Matter -18 1.    What is the process called in which a substance is changed from solid to liquid state by adding heat? a) Melting b) Boiling c) None of these d) Vaporization 2.    What is the process called in which a substance is changed from solid to liquid state by adding heat? a) Fusion b) Vaporization c) Boiling d) None of these 3.    What is the temperature called at which a solid starts melting? a) Freezing point b) Boiling point c) Fusion point d) Vaporization point 4.    What is the temperature called at which a solid starts melting? a) Vaporization point b) Freezing point c) Melting point d) Boiling point 5.    What is the temperature called at which a substance changes from liquid to solid state? a) Melting point b) Freezing point c) Vaporization point d) Boiling point 6.    What is the heat energy called that is required to change unit mass of a substance from solid to liquid state at its melting point without change in its temperature? a) Latent heat of boiling b) Latent heat of fusion c) Latent heat of freezing d) Latent heat of vaporization 7.    How is latent heat of fusion denoted? a) Hv b) Hr c) Hf d) Hm 8.    What is the formula of latent heat of fusion? a) Latent heat of fusion = ∆Qf - m b) Latent heat of fusion = ∆Qf x m c) Latent heat of fusion = ∆Qf + m d) Latent heat of fusion = ∆Qf / m 9.    At what temperature, ice changes into water? a) 100oC b) 0oC c) 3.36oC d) 1oC 10.    What is the latent heat of fusion of ice? a) 8.36 x105 Jkg-1 b) 3.36 x105 Jkg-1 c) 6.36 x105 Jkg-1 d) 4.36 x105 Jkg-1

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