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DP IB Physics: SL

Topic Questions

Home / IB / Physics: SL / DP / Topic Questions / 3. Thermal Physics / 3.1 Thermal Concepts / Multiple Choice


3.1 Thermal Concepts

Question 1

Marks: 1

In the table below, which row shows the correct conversion between the Kelvin and Celsius temperature scales?

  Kelvin temperature / K Celsius temperature / °C
A. 0 –270
B. -273 0
C. 150 -123
D. 210 -163
    Choose your answer
      
    Key Concepts
    Temperature

    Question 2

    Marks: 1

    Thermal energy is transferred from a solid. Three properties of the solid are 

    1. Specific heat capacity
    2. Mass
    3. Area

    Which of the above properties determine the decrease in temperature of the solid?

    • II only

    • I and III only

    • I and II only

    • I only

    Choose your answer
      
    Key Concepts
    Specific Heat Capacity

    Question 3

    Marks: 1

    What are the units of the ratio fraction numerator s p e c i f i c space l a t e n t space h e a t space o f space f u s i o n space o f space i r o n over denominator s p e c i f i c space h e a t space c a p a c i t y space o f space i r o n end fraction?

    • J K

    • No units

    • K–1

    • K

    Choose your answer
      

    Question 4

    Marks: 1

    The strength of intermolecular forces varies between in the different states of matter.

    What is the order from highest to lowest strength of intermolecular forces?

    • solid > liquid > gas

    • solid > gas > liquid

    • liquid > gas > solid

    • gas > liquid > solid

    Choose your answer
      

    Question 5

    Marks: 1

    Molecules fuse from water vapour to form water. The vapour and the water have the same temperature.

    What is the change of the average potential energy and the change of the average random kinetic energy of these molecules when they move from the vapour to the water?

      Average potential energy Average random kinetic energy
    A. decreases decreases
    B. no change decreases
    C. decreases no change
    D. no change  no change
      Choose your answer
        
      Key Concepts
      Internal Energy

      Question 6

      Marks: 1

      Which of the following correctly identifies the properties of the molecules of a substance that determine the substance’s internal energy?

      • The total gravitational potential energy and random electrostatic potential energy

      • The total potential energy and random kinetic energy

      • The random kinetic energy

      • The total potential energy

      Choose your answer
        
      Key Concepts
      Internal Energy

      Question 7

      Marks: 1

      The specific latent heat of vaporisation is the energy required to change the phase of

      • one kilogram of a liquid to gas.

      • a solid at constant temperature.

      • one kilogram of a gas to liquid at constant temperature.

      • a gas at constant temperature.

      Choose your answer
        
      Key Concepts
      Specific Heat Capacity

      Question 8

      Marks: 1

      A sample of solid aluminium is heated beyond its melting point. The graph shows the variation of temperature with time.

      3-1-q8-sl-easy-mcq-phy

      During which stage(s) is the aluminium melting?

      • Q only

      •  P, Q and R

      • P only

      • P and R only

      Choose your answer
        

      Question 9

      Marks: 1

      What is the correct comparison of the specific latent heat of fusion Lf to the specific latent heat of vaporisation Lfor any substance?

      • L= Lv

      • Lf Lv

      • Lf Lv

      • Depends on the substance.

      Choose your answer
        
      Key Concepts
      Specific Latent Heat

      Question 10

      Marks: 1

      Which of the following is numerically equal to the specific heat capacity of a substance?

      • The thermal energy required to increase the temperature of unit mass of the substance by 1 °C

      • The thermal energy required to increase the temperature of the substance by 1 °C

      • The sum of the random kinetic and potential energy of all the molecules in the substance

      • The thermal energy required to evaporate the substance

      Choose your answer
        
      Key Concepts
      Specific Heat Capacity