43. Properties of substances like pressure, temperature and density, in thermodynamic coordinates are
A.Path functions
B.Point functions
C.Cyclic functions
D.Real functions

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44. 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

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45. Which of the following quantities is not the property of the system
A.Pressure
B.Temperature
C.Specific volume
D.Heat

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46. Mixture of ice and water form a
A.Closed system
B.Open system
C.Isolated system
D.Heterogeneous system

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47. According to Avogadro's law, for a given pressure and temperature, each molecule of a gas
A.Occupies volume proportional to its molecular weight
B.Occupies volume proportional to its specific weight
C.Occupies same volume
D.Occupies volume inversely proportional to its specific weight

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48. On weight basis, air contains following parts of oxygen
A.21
B.23
C.25
D.73

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49. Which of the following is the property of a system
A.Pressure and temperature
B.Internal energy
C.Enthalpy and entropy
D.All of the above

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