Exam (elaborations)
Chapter Twelve THERMODYNAMICS
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Chapter Twelve THERMODYNAMICS
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Chapter TwelveTHERMODYNAMICS
MCQ I
12.1 An ideal gas undergoes four different processes from the
same initial state (Fig. 12.1). Four processes are adiabatic,
isothermal, isobaric and isochoric. Out of 1, 2, 3 and 4 which 4
one is adiabatic. P 3
(a) 4 2
(b) 3 1
(c) 2
V
(d) 1
Fig. 12.1
12.2 If an average person jogs, hse produces 14.5 × 103 cal/min. This is
removed by the evaporation of sweat. The amount of sweat evaporated
per minute (assuming 1 kg requires 580 × 103 cal for evaparation) is
(a) 0.25 kg
(b) 2.25 kg
(c) 0.05 kg
(d) 0.20 kg
20/04/2018
, Exemplar Problems–Physics
12.3 Consider P-V diagram for an ideal gas shown in Fig 12.2.
P 1
Con s ta n t
P=
V
2
V
Fig. 12.2
Out of the following diagrams (Fig. 12.3), which represents
the T-P diagram?
TT T
2
2
1 1
P P
(i) (ii)
T T
2 1 1 2
P P
(iii) (iv)
Fig. 12.3
(a) (iv)
(b) (ii)
(c) (iii)
(d) (i)
12.4 An ideal gas undergoes cyclic process ABCDA as shown in given
P-V diagram (Fig. 12.4).
The amount of work done by
the gas is
(a) 6PoVo
(b) –2 PoVo
(c) + 2 PoVo
(d) + 4 PoVo
Fig 12.4
84
20/04/2018
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