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Pune University - FY BSc PHYSICS - I, April 2010

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Total No. of Questions : 5] [Total No. of Pages : 3 [3717] - 3 P181 F.Y. B.Sc. PHYSICS - I Mechanics, Heat and Thermodynamics (Paper - I) (New Course) Time : 3 Hours] Instructions to the candidates : 1) All questions are compulsory. 2) Figures to the right indicate full marks. 3) Use of log table and calculator is allowed. 4) Neat diagram must be drawn wherever necessary. [Max. Marks : 80 Q1) Attempt all of the following : a) Define instantaneous speed and velocity. [2] b) What do you mean by inertia of the body. [2] c) State Pascal s law. [2] d) Calculate speed of bob of simple pendulum at its mean position, if the bob is to rise a maximum vertical height of 5 cm. [2] e) What is mean by reversible process? [2] f) What is equation of state? Give equation of state for perfect gas. [2] g) Give principle of resistance thermometer. [2] h) Find the coefficient of performance of Carnot s refrigerator working [2] between 227oC & 27oC. Q2) Attempt any four of the following : a) What is an average acceleration? Interpret average acceleration using V-t graph in one dimensional motion. [4] b) Explain the workdone. Obtain workdone by a constant force. [4] c) What is electromagnetic force? Give its properties. [4] d) A film of soap solution is formed in a metal ring of radius 1.5 cm. Find potential energy stored in the film, if surface tension of soap solution is [4] 0.035 J/m2. P.T.O. e) Two horizontal pipes of diameter 40 cm and 60 cm are joined together. The speed and pressure of water flowing in the first pipe are 9 m/s and 2 x 104 N/m2. Calculate these quantities in the second pipe. (Density of water = 103 kg/m3) [4] f) A position of a car on straight road with time is given by the equation x(t) = 10 + 25t + 5t2 in meters. When time is in second find instantaneous velocities at i) t = 1 sec. ii) t = 5 sec. iii) t = 10 sec. [4] Q3) Attempt any four of the following : a) Derive an expression for workdone during an adiabatic process. [4] b) Explain four thermodynamic functions U, H, F and G. [4] c) Explain otto cycle with an indicator diagram. [4] d) e) 1 th of heat in to work. When the temp. of A reversible engine converts 6 the sink is decreased by 62oK its efficiency is doubled. Find the temperatures of source and sink. [4] Calculate the pressure exerted by one mole of water vapour in a 0.01 m3 container at 423oK assuming if to obey Van der waal s equation. given a = 0.364 Nm4 mole 2, b = 3.05 x 10 5 m3 mole 1. f) [4] One mole of oxygen at 0oC is compressed until the volume reduces to 1 th of its initial value at the same temperature. Calculate the workdone. 4 [4] Q4) Attempt any two of the following : a) State and prove Archimede s principle. b) i) Define surface tension and explain the effect of temperature on the surface tension. [4] ii) Find the workdone in moving a particle along a vector r r r r rr r r v = 3s j + 6 k meter, If the applied force is F = s + 3 j + 2 k ( ) ( newton. [3717] -3 [8] ) [4] 2 c) i) State the principle of conservation of energy. Give one example. [4] ii) Two blocks of mass m1 = 10 kg, and m2 = 20 kg are tied together by light string and are placed on frictionless horizontal surface. r when m1 is pulled by a force F an acceleration 10 m/s2 is produced in both masses. Calculate 1) The magnitude of the force. 2) Tension in the string. [4] Q5) Attempt any two of the following : a) Describe the Carnot s engine and show that its efficiency is function of working temperature only. [8] b) i) State advantages of mercury thermometer. ii) The expansion ratio and compression ratio are 5 and 10 respectively. If the value of =1.4 for working substance in a diesel engine then determine its efficiency. [4] i) Give any four applications of Air conditioning. ii) Determine critical temperature for Helium from the following data c) [4] [4] a = 3.44 J m3 K mole 2 b = 0.0234 m3 K mole 1 R = 8.315 J mole 1 K 1 [3717] -3 [4] 3

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Additional Info : F.Y. B.Sc. PHYSICS - I : Mechanics, Heat and Thermodynamics (Paper - I) (New Course), Pune University
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