OldExamQuestionsCh.#19 (Dr. GondalPhys102)
T071
Q13
. A gas initially at a temperature of 0
o
C and a pressure of 100 kPa is compressed isothermally from 30 L to 20 L. What is the
work required? (1.2 kJ)
Q19.
An ideal monatomic gas, undergoes an adiabatic expansion to onethird of its initial pressure. Find the ratio of the final volume
to the initial volume. (Ans: 1.9)
Q20.
A gas undergoes the cyclic process shown in the figure1. The net heat absorbed during the complete cycle is 1000 J. Find the
work done by the gas for the process c to a. (Ans: 1000 J)
T062
Q14.
One mole of an ideal monatomic gas, initially at 300 K, expands adiabatically to twice of its initial volume. The work done in this
process is: (Ans: 1.4 J)
Q15.
One mole of a monatomic ideal gas absorbs heat at constant pressure and its temperature rises from 40 °C to 90 °C. The heat
absorbed in the process is (Ans: 1.0 kJ)
Q16.
Two moles of an ideal monatomic gas are compressed adiabatically from A to B and then further compressed isothermally from B
to C as shown in the figure 1. Calculate the net heat transfer in the process from A to C. (Ans: 6.7 kJ)
Fig. 1, T071 Figure 1, T062
T061:
Q14.
One mole of a diatomic ideal gas is initially at a temperature of 127
o
C and has a volume of 0.090
m
3
. The gas is compressed adiabatically to a volume of 0.045 m
3
. What is the final temperature? (Ans: 528 K) Q15.
Q 2.
6 moles of an ideal gas are kept at a constant temperature of 60 .0
o
C while the pressure of the gas is increased
from 1.00 atm to 4.00 atm. Find the heat involved during this process. (Ans: 23 kJ) Q16. A sample of one mole of
an ideal gas is taken through the cyclic process ABCA as shown in the Figure 1. What is the net energy added to the
gas as heat during the cycle? (Ans: 12 kJ).
T052:
Q#2.
One mole of an ideal gas is cooled at constant pressure process from 100
o
C to 40
o
C. Calculate the
work done during the process. (Ans: –500 J)
Q#10.
A sample of argon gas ( M
Ar
= 40 g/mole) is at four times the
absolute temperature of hydrogen gas (M
H
= 2 g/mole). The ratio of the rms speed of the argon atoms to that of
hydrogen molecules is: (Ans: 0.45 )
Q#20.
A monatomic ideal gas is compressed adiabatically from an initial
pressure of 1 atm and volume of 800 cm
3
to a volume of 400 cm
3
. If the initial temperature of the gas is 20
o
C, what
is the final temperature of the gas? (Take γ=1.67) (Ans: 466 K.)
T051:
Q#13.
A sample of an ideal gas is compressed by a piston from 10 m
3
to 5 m
3
and simultaneously cooled
from 540 K to 270 K. As a result there is: (Ans: No change in pressure.
Q#14.
An ideal gas expands at constant
pressure of 120 kPa from (a) to (b) as shown in the Figure 1. It is then compressed isothermally to point (c) where
the volume is is 40 L. Find the net work done during these two processes ( Ans: 1060 J )
Q#15.
Two moles of ideal
gas are at 20
o
C and a pressure of 200 kPa. If the gas is heated to 40
o
C, and its pressure is reduced by 30%, what is
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 Spring '09
 n/a
 Thermodynamics

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