Mechanical Engineering Interview Questions ~ Thermodynamics (Part-4)

01. The property of a working substance which increases or decreases as the heat is supplied or removed in a reversible manner, is known as

        ◾Enthalpy
        ◾Internal Energy

        ◾Entropy

        ◾External Energy

Answer: Entropy

02. The property of a working substance which increases or decreases as the heat is supplied or removed in a reversible manner, is known

        ◾Pressure and Temperature
        ◾Temperature and Work

        ◾Heat and Work

        ◾All of these

Answer: Pressure and Temperature

03. The entropy of water at 0^oC is assumed to be

        ◾1
        ◾0

        ◾-1

        ◾10

Answer: 0

04. The change of entropy when heat is absorbed by the gas is

        ◾Positive
        ◾Negative

        ◾Positive or Negative

Answer: Positive

05. The velocity of molecules

        ◾Increases with the increase of temperature
        ◾Increases with the decrease of temperature
        ◾Decreases with the decrease of temperature
        ◾Remain constant at all temperatures

Answer: Increases with the increase of temperature

06. The pressure exerted by an ideal gas is ............. of the kinetic energy of all the molecules contained in a unit volume of gas.

        ◾One half
        ◾One third
        ◾Two third
        ◾Three fourth

Answer: Two third