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
Related Mcqs:
- The condition of perfect vacuum, i.e., absolute zero pressure can be attained at ____________________?
A. a temperature of – 273.16°C
B. a temperature of 0°C
C. a temperature of 273 °K
D. a negative pressure and 0°C temperature
E. can’t be attained - The same volume of all gases would represent their____________________?
A. densities
B. specific weights
C. molecular weights
D. gas characteristic constants
E. specific gravities - On volume basis, air contains following parts of oxygen _____________________?
A. 21
B. 23
C. 25
D. 77
E. 79 - Total heat of a substance is also known as __________________?
A. internal energy
B. entropy
C. thermal capacity
D. enthalpy
E. thermal conductance - If both Stirling and Carnot cycles operate within the same temperature limits, then efficiency of Stirling cycle as compared to Carnot cycle___________________?
A. more
B. less
C. equal
D. depends on other factors
E. none of the above - Stirling and Ericsson cycles are__________________?
A. reversible cycles
B. irreversible cycles
C. quasi-static cycles
D. semi-reversible cycles
E. adiabatic irreversible cycles - First law of thermodynamics___________________?
A. enables to determine change in internal energy of the system
B. does not help to predict whether the system will or not undergo a change
C. does not enable to determine change in entropy
D. provides relationship between heat, work and internal energy
E. all of the above - Universal gas constant is defined as equal to product of the molecular weight of the gas and_______________?
A. specific heat at constant pressure
B. specific heat at constant volume
C. ratio of two specific heats
D. gas constant
E. unity. - An open 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 - Which of the following can be regarded as gas so that gas laws could be applicable, within the commonly encountered temperature limits ?
A. 02, N2, steam, C02
B. Oz, N2, water vapour
C. S02, NH3, C02, moisture
D. 02, N2, H2, air
E. steam vapours, H2, C02
