Physics
Thermodynamic
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#17 The First Law of Thermodynamics is
A) Q = W
B) ?U = Q - W
C) ?U = W - Q
D) Q = ?U - W
#18 In the sign convention used in physics here, W is positive when
A) work is done on the gas
B) work is done by the gas
C) no work is done
D) volume decreases
#19 For isochoric (constant volume) process, work W equals
A) P?V
B) zero
C) nRT ln(V2/V1)
D) ?PdV ? 0
#20 For isothermal expansion of ideal gas, ?U equals
A) positive
B) negative
C) zero
D) infinite
#21 Work in isothermal expansion of ideal gas (n moles) is
A) W = nR(T2-T1)
B) W = nRT ln(V2/V1)
C) W = P?V ˜ 0
D) W = 0
#22 For adiabatic process of ideal gas, heat exchanged Q is
A) nCp?T
B) nCv?T
C) zero
D) nR ln(V2/V1)
#23 In a quasistatic process, the system
A) is always far from equilibrium
B) passes through a succession of equilibrium states
C) exchanges matter continuously
D) must be adiabatic
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