Thermometry, Thermal Expansion & Calorimetry
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Questions and Answers

What is the unit of thermal capacity in practical system?

  • J/g°C
  • cal/g°C
  • Joule/k
  • cal/°C (correct)

    • What is the amount of heat required to change the state of the mass m of the substance?

  • Q = WcΔθ
  • Q = mc
  • Q = mcΔθ
  • Q = mL (correct)

    • What is the term for the mass of water which would absorb or evolve the same amount of heat as is done by the body in rising or falling through the same range of temperature?

  • Water equivalent (correct)
  • Specific heat
  • Latent heat
  • Thermal capacity

    • What happens to the molecules when energy is released during a change of state?

    <p>They come closer</p> Signup and view all the answers

    What is the term for the amount of heat required to raise the temperature of a unit mass of a substance by 1°C?

    <p>Specific heat capacity</p> Signup and view all the answers

    What is the process by which heat is transferred from one body to another due to a difference in temperature?

    <p>Heat conduction</p> Signup and view all the answers

    What is the term for the energy required to change the state of a substance from solid to liquid?

    <p>Latent heat of fusion</p> Signup and view all the answers

    What is the graph that shows the relationship between temperature and time when heat is supplied to a solid at a constant rate?

    <p>Heating curve</p> Signup and view all the answers

    What is the law that states that the total heat lost by a system is equal to the total heat gained by the surroundings?

    <p>Law of conservation of heat</p> Signup and view all the answers

    What is the physical significance of the slope of the temperature-time curve in the region OA?

    <p>Rate of heat transfer</p> Signup and view all the answers

    What is the physical significance of the region AB in the temperature-time graph?

    <p>Melting of solid</p> Signup and view all the answers

    What is the proportionality relationship between the specific heat capacity of a liquid and the slope of the temperature-time curve in the region BC?

    <p>Inversely proportional</p> Signup and view all the answers

    What is the proportionality relationship between the latent heat of vaporization and the length of the line CD?

    <p>Directly proportional</p> Signup and view all the answers

    Why is it more painful to get burnt by steam rather than by boiling water at the same temperature?

    <p>Steam releases more heat energy than water when condensing</p> Signup and view all the answers

    What is the primary reason for the temperature of the mixture to reach thermal equilibrium when water at temperature θ °C is mixed with ice at 0 °C?

    <p>The heat gained by the ice is equal to the heat lost by the water.</p> Signup and view all the answers

    What is the significance of the mechanical equivalent of heat J?

    <p>It is a conversion factor that is used to convert Joule or erg into calorie or kilo calories vice-versa.</p> Signup and view all the answers

    What is the primary factor that determines the temperature of the mixture when water at temperature θ °C is mixed with ice at 0 °C?

    <p>The masses of the water and the ice.</p> Signup and view all the answers

    What is the principle behind the process of calorimetry?

    <p>The heat lost by the system is equal to the heat gained by the surroundings.</p> Signup and view all the answers

    What is the reason for the feeling of coldness when ice melts, as observed in the mountains?

    <p>The heat is absorbed by the melting ice.</p> Signup and view all the answers

    What is the reason for the difference in the specific heat capacity of a solid and a liquid at the same temperature?

    <p>Difference in molecular spacing</p> Signup and view all the answers

    What is the effect of an increase in pressure on the boiling point of a liquid?

    <p>The boiling point increases</p> Signup and view all the answers

    What is the process by which heat is transferred through a material due to a difference in density?

    <p>Convection</p> Signup and view all the answers

    What is the reason for the difference in the latent heat of vaporization and latent heat of fusion for the same substance?

    <p>Difference in intermolecular forces</p> Signup and view all the answers

    During the change of state from solid to liquid, what happens to the temperature?

    <p>The temperature remains constant.</p> Signup and view all the answers

    What is the physical significance of the region CD in the temperature-time graph?

    <p>It represents the change of state from liquid to vapour.</p> Signup and view all the answers

    Why is it more painful to get burned by steam than by boiling water at the same temperature?

    <p>Because steam releases more heat energy than boiling water.</p> Signup and view all the answers

    What is the unit of thermal capacity in the S.I. system?

    <p>Joule/k</p> Signup and view all the answers

    What is the relationship between the specific heat capacity of a substance and its thermal capacity?

    <p>They are directly proportional.</p> Signup and view all the answers

    What happens to the molecules during a change of state when energy is released?

    <p>They come closer.</p> Signup and view all the answers

    What is the effect of an increase in pressure on the boiling point of a liquid?

    <p>It increases.</p> Signup and view all the answers

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