Thermodynamic — Physics MCQs (Class 11)
Free chapter-wise Physics MCQs with answers for MDCAT, FSc and entry tests.
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#73 Numerical: Work 1200 J done on an insulated system (Q=0). ?U equals
A) -1200 J
B) +1200 J
C) 0
D) +600 J
#74 Numerical: If 500 cal heat is supplied and 600 J work is done by system, ?U˜
A) 500 J
B) 2093 J
C) 1486 J
D) 600 J
#75 In a rigid container, adding heat primarily changes
A) pressure/temperature (internal energy)
B) volume (work)
C) mass
D) none
#76 A process with Q>0 and W<0 could be
A) heating with compression
B) cooling with expansion
C) adiabatic
D) isothermal with no work
#77 Temperature rise relates to internal energy increase because
A) molecules move faster on average
B) mass decreases
C) volume vanishes
D) pressure is zero
#78 Thermal equilibrium implies equality of
A) chemical potentials only
B) temperatures of systems
C) pressures of systems
D) volumes of systems
#79 At constant temperature, an ideal gas does work during expansion by drawing
A) heat from surroundings to keep T constant
B) no heat
C) internal energy increase
D) latent heat
#80 Numerical: 1.5 mol ideal gas undergoes ?T=25 K at constant V. Take R=8.31. ?U˜
A) 156 J
B) 467 J
C) 469 J (monoatomic: (3/2)nR?T)
D) 779 J
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