Physics
Thermodynamic
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#49 Numerical: Gas expands isothermally from V1 to 2V1 at T=300 K, n=1 mol. Work W˜
A) nRT ln2
B) nRT
C) 2nRT
D) 0
Answer: A
#50 Numerical: For adiabatic expansion of ideal gas with ?=5/3, PV^?=
A) constant
B) zero
C) proportional to T
D) proportional to V
Answer: A
#51 Numerical: 1 mol ideal gas at 300 K compressed isothermally to half volume. W by gas˜
A) +nRT ln2
B) -nRT ln2
C) +2nRT
D) 0
Answer: B
#52 Numerical: At constant P=1.0×10^5 Pa, ?V=0.010 m^3. Work by gas˜
A) 1000 J
B) 100 J
C) 10 J
D) 1 J
Answer: A
#53 Numerical: A system has Q=500 J and W=200 J (by system). ?U=
A) 700 J
B) 300 J
C) 500 J
D) -300 J
Answer: B
#54 Numerical: If ?U=-100 J and W=+250 J (by system), then Q=
A) 150 J
B) -350 J
C) 350 J
D) -150 J
Answer: A
#55 Numerical: 0.5 mol monoatomic ideal gas: ?T=60 K. ?U˜
A) (3/2)nR?T
B) (5/2)nR?T
C) nR?T
D) 0
Answer: A
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