Physics
Thermodynamic
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#57 Numerical: 1 mol ideal gas heated isobarically ?T=40 K, Cp=(5/2)R. Q˜
A) 40R
B) 60R
C) 100R
D) (5/2)R
Answer: A
#58 Numerical: Same process: work W˜
A) nR?T
B) 0
C) nCv?T
D) nCp?T
Answer: A
#59 Numerical: A gas absorbs 1200 J while 300 J of work is done on it. ?U=
A) 900 J
B) 1500 J
C) -900 J
D) -1500 J
Answer: B
#60 For cyclic process, net change in internal energy is
A) positive
B) negative
C) zero
D) infinite
Answer: C
#61 In a PV diagram, clockwise cycle area represents
A) work done on system
B) work done by system
C) zero work
D) heat lost
Answer: B
#62 For ideal gas, U depends only on
A) pressure
B) volume
C) temperature
D) density
Answer: C
#63 In adiabatic expansion of ideal gas, temperature
A) increases
B) decreases
C) remains same
D) oscillates
Answer: B
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