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Thermodynamics Test - 76

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Thermodynamics Test - 76
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  • Question 1
    4 / -1
    Assertion Air quickly leaking out of a balloon becomes cooler.
    Reason The leaking air undergoes adiabatic expansion.
  • Question 2
    4 / -1
    Assertion Thermodynamic processes in nature are irreversible.
    Reason Dissipative effects can not be eliminated.
  • Question 3
    4 / -1
    Assertion When a bottle of cold carbonated drink is opened, a slight fog forms around the opening.
    Reason Adiabatic expansion of the gas causes lowering of temperature and condensation of water vapours.
  • Question 4
    4 / -1
    Assertion The isothermal curves intersect each other at a certain point.
    Reason The isothermal change takes place slowly, so the isothermal curves have very little slope.
  • Question 5
    4 / -1
    Assertion In adiabatic compression, the internal energy and temperature of the system get decreased.
    Reason The adiabatic compression is a slow process.
  • Question 6
    4 / -1
    Assertion In isothermal process whole of the heat energy supplied to the body is converted into internal energy.
    Reason According to the first law of thermodynamics ΔQ = ΔU + PΔV.
  • Question 7
    4 / -1
    Assertion We can not change the temperature of a body without giving (or taking) heat to (or from) it.
    Reason According to principle of conservation of energy, total energy of a system should remain conserved.
  • Question 8
    4 / -1
    Assertion The specific heat of a gas in an adiabatic process is zero and in an isothermal process is infinite.
    Reason Specific heat of a gas is directly proportional to change of heat in system and inversely proportional to change in temperature.
    Solution

  • Question 9
    4 / -1
    Assertion The heat supplied to a system is always equal to the increase in its internal energy.
    Reason When a system changes from one thermal equilibrium to another, some heat is absorbed by it.
  • Question 10
    4 / -1
    Assertion The temperature of the surface of the sun is approximately 6000 K. If we take a big lens and focus the sun rays, we can produce a temperature of 8000 K.
    Reason This highest temperature can be produced according to second law of thermodynamics.
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