Exam preparation MCQs with answers

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An isolated system is one in which_____________________?
  • (A)  mass does not cross boundaries of the system, though energy may do so
  • (B)  neither mass nor energy crosses the boundaries of the system
  • (C)  both energy and mass cross the boundaries of the system
  • (D)  mass crosses the boundary but not the energy
  • (E)  thermodynamic reactions do not occur
According to Avogadro’s Hypothesis ______________________?
  • (A)  the molecular weights of all the perfect gases occupy the same volume under same conditions of pressure and temperature
  • (B)  the sum of partial pressure of mixture of two gases is sum of the two
  • (C)  product of the gas constant and the molecular weight of an ideal gas is constant
  • (D)  gases have two values of specific heat
  • (E)  all systems can be regarded as closed systems