OldExamQuestionsCh.#19 (Dr. GondalPhys102)
T081:
Q12.A gas expands from a volume of 2.00 m
3
to a volume of 6.00 m
3
along two different paths as shown in
Fig 2. The heat added to the gas along path IAF equals 1.68 × 10
6
J. Find the heat added during path IF.
(Ans: 1.48 × 10
6
J)
Q13: Fig. 3. shows a cycle undergone by 1.0 mol of a monatomic ideal gas. What is the heat added to the
gas during the whole cycle? (Ans: 520 J)
Q14. What is the change in the internal energy of a 1.00 mole of a monatomic ideal gas that goes from
point 1 (T1= 455K and pressure P1 = 1.00 atm) to point 2 (T2 = 300 K and pressure P2 = 1.00 atm.)? (Ans:
1930 J)
Q15. The mass of an oxygen molecule is 16 times that of a hydrogen molecule. At room temperature, the
ratio of the rms speed of an oxygen molecule to that of a hydrogen molecule is: (Ans: ¼)
Q16. A 0.825 mol of an ideal gas undergoes an isothermal process. The initial volume is 0.20 m
3
and the fi
nal volume is 0.30 m
3
. If the heat added to the gas is 1000 J, find the temperature of the gas. (Ans: 360 K)
T072:
Q15.
An ideal monatomic gas expands from state A to state B along the straight line path shown. Below in
Fig. 1. Calculate the heat absorbed by the gas in the process. (Ans:
+962 J)
Q16
. An ideal gas is initially at a pressure of 1.40 atm and has a volume of 3.50 L. It expands isothermally
to a final pressure of 0.600 atm. What is the work done in the process? (Ans:
+ 420 J)
Q17
. One mole of an ideal monatomic gas is taken through an adiabatic process, as shown in the Fig. 2.
Calculate the work done in this process. (Ans: 7.8 kJ)
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)
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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.
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 Spring '10
 dr.P
 Thermodynamics, pH

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