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# Ch-19 - Old-Exam-Questions-Ch#19(Dr Gondal-Phys102 T081...

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Old-Exam-Questions-Ch.#19 (Dr. Gondal-Phys102) 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 one-third 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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Ch-19 - Old-Exam-Questions-Ch#19(Dr Gondal-Phys102 T081...

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