B.Sc. Physics Past Papers of Thermodynamics (Paper B , Section-I) University of Sargodha
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B.Sc. 1st Annual Exam 2015
Q # 1. (a) The Maxwell Speed Distribution function is given as:
(b) One mole of oxygen gas expands isothermally at 310 K from initial volume of 12 L to the final volume of 19 L. What would be the final temperature if the gas had expanded adiabatically to the same final volume?
(c) There are five number 5, 11, 32, 67 and 89. What is the rms value of these numbers.
Q # 2. (a) What is Carnot engine? Calculate the work done and efficiency of Carnot Heat Engine.
(b) The temperature of one mole of mono-atomic gas is raised reversibly 300 K to 400 K with the volume kept constant. What is the entropy change of the gas?
(c) What are the two statements of Second Law of Thermodynamics?
B.Sc. 1st Annual Exam 2014
Q # 1. (a) Discuss the distribution of molecular energies. Hence derive the Maxwell Boltzmann energy distribution formula.
(b) A cylindrical container of length 56 cm and diameter 12.5 cm holds 0.35 moles of nitrogen gas at the pressure of 2.05 atm. Calculate rms speed of the nitrogen molecules.
(c) Show that for adiabatic process 
Q # 2. (a) What are the two statements of second law of thermodynamics? Show that the statements are equivalent.
(b) A refregerator whose COP is 4.7, extract heat from the food chamber at the rate of 250 J/cycle. How much work per cycle is required to operate the refrigerator?
(c) What is the connection between entropy and the second law of thermodynamics.
B.Sc. 1st Annual Exam 2013
Q # 1. (a) State and explain the first law of thermodynamics and discuss its applications for constant temperature.
(b) Apparatus that liquefies helium is in a room at 300 K. If the helium is in the apparatus is at 4.0 K, what is the minimum ratio of heat delivered to the room to the heat removed from the helium?
What factors reduce the efficiency of a heat engine from its ideal value.
Q # 2. (a) What is ideal gas? Describe the work done on ideal gas at constant pressure and temperature.
(b) An ideal gas undergoes a reversible isothermal expansion at 
. The entropy of the gas increases by 46 J/K. How much heat was absorbed?
. The entropy of the gas increases by 46 J/K. How much heat was absorbed?(c) Explain why temperature of a gas drops in an adiabatic expansion.
B.Sc. 1st Annual Exam 2012
Q # 1. (a) What is an ideal gas? Discuss work done on an ideal gas during thermal isolation.
(b) Calculate work done by the external agent in compressing 1.12 mole of oxygen from a volume of 22.4 L at 1.53 atm pressure to 15.3 L at the same temperature.
(c) How is the speed of sound related to gas variables in kinetic theory model?
Q # 2. (a) Define mean free path of a molecule travelling through a gas, also calculate mean free path on microscopic level.
(b) Calculate the mean free path for 35 spherical jelly beans in a jar that is vigorously shaken, the volume of jar is 1.0 L and the diameter of jelly beans is 1.0 cm.
(c) List three examples of Brownian motion in physical phenomenon.
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ہمیں اس کار خیر کو بہتر بنانے کےلئے آپ کی مدد کی ضرورت ہے۔اپنی قیمتی آراءاور نوٹس ای میل کریں یا فیس بک ایڈیس پر میسیج کریں۔
والسلام : محمد علی ملک، گورنمنٹ ڈگری کالج نوشہرہ
