BSc Sem I 2017 2018 2018 Physics I Question Paper - Mumbai University | munotes

Questions asked in this paper

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• N.B. 1. Figures to the right indicate full marks

1. Q2 Use of non-programmable calculator is permitted
2. Q1 The coefficient of static friction in terms of normal reaction N and limiting force of friction f acting on a mass mis given by
   • ii) Airplane’s dynamic is based on Two lenses with focal lengths 10cm and 20cm and made of same material are placed coaxially separated by distance d. The value of d such that the system is
   • c) 10 cm d) 15 cm
   • iv) Radius of Newton's ring seen with light of wavelength is proportional to
   • a) wavelength. of light b) thickness the air film square root of wavelength d) radius of curvature of lens
   • v) The of the constants b in Vander Waals’ gas equation are that of
   • vi) Which. of the following path function?
   • a) Work done by the system b) Internal energy
   • c) Heat absorbed by the system d) Both a and c
   • B) Answer in one sentence. 3
   • i) Define Young’s modulus
3. Q11 State any one method of reducing spherical aberration
   • iii) State the reason for volume correction by Van der Waal in ideal gas equation
   • C) Fill in the blanks. 5
4. Q1 The working of venturimeter is based on the principle
   • ii) Poise is the unit of
5. Q1 In eyepiece, are not used
   • iv) The centre of the Newton's rings pattern in reflected light appears
   • v) The amount of work done in an isochoric process is
6. Q2 A) Attempt ANY ONE. 8 marks
   • i) A body of mass m is suspended by two strings making angles and with the horizontal. Find the expression for tensions in the strings. If kg, Find magnitudes of tensions T; and T2 in the two strings
   • Q.P. Code:24982
   • ii) Define Modulus of Rigidity and Poisson’s Ratio. Consider a unit cube of homogenous, isotropic material and show that Y = where symbols have their usual meanings
   • B) Attempt ANY ONE. 8
   • i) Establish relation Y = 3K (1 — 20) between elastic constants considering a unit cube of and isotropic material
   • ii) Derive Bernoulli’s theorem for streamline flow
   • C) Attempt ANY ONE. 4
   • i) The coefficient of static friction between the of 3 kg and the table is 0.3. What should the limiting value of mass ‘m’ the block remains at rest? The string and pulley are light and
   • ii) A metal plate of area 10 cm’ rests on thick layer of oil. If an external force of 0.5 N applied on the plate keeps it moving with a uniform speed of 1.5 cm/s, find the coefficient of viscosity of oil
7. Q3 A) Attempt ANY ONE. 8 marks
   • i) With the help of a diagram, explain chromatic aberration and hence obtain the expression for longitudinal chromatic aberration when the object is placed at
   • ii) With the help of diagrams, explain the principal and focal pomts of a thick lens Also, explain their importance
   • B) Attempt any ONE 8
   • i) What are Newton's rings? Derive expressions for the radi of dark What is an eyepiece? Explain the construction of Ramsden's eyepiece and draw a diagram representing positions of its cardinal points. Can we use cross-wires with this eyepiece?
   • C) Attempt ANY ONE 4
8. Q1 An achromatic doublet of focal length 10cm has two lenses made of materials having dispersive powers in the ratio 3:4. What may the focal lengths of the two
   • ii) A wedge-shaped. film having wedge angle of 30 seconds of an arc is formed by introducing a drop of liquid of refractive index 1.5 between two glass plates. If light of 6000 is used, find the distance between successive bright fringes viewed in reflected light
9. Q4 A) Attempt ANY ONE 8 marks
10. Q1 Derive an expression for the work done by an ideal gas in an adiabatic process
    • ii) Explain the behaviour of gases at high pressure and hence obtain the expression for the Boyle’s temperature
    • Q.P. Code:24982
    • B) Attempt ANY ONE 8
11. Q1 Show that, for an ideal gas, the relation between specific heats is Cp — Cv = R; where, the symbols have their usual meanings
    • ii) State the ideal gas equation. Discuss the Van der Waals’ corrections to the pressure and volume terms of this equation
    • C) Attempt ANY ONE 4
    • i) One mok of a perfect gas at 127 undergoes isothermal expansion till the volume is doubled. Calculate the work done by gas and the heat absorbed
    • ii) The air i a motor car’s tyre-tube has a pressure of 3 atm, at the room temperature of 27 If the tyre suddenly bursts, determine the resulting
12. Q5 Attempt ANY FOUR 20 marks
    • i) A block slides down an incline of inclination angle with an acceleration Find the coefficient of kinetic friction
    • ii) For an incompressible fluid flowing with velocity v through a pipe having area of cross-section A show that Av=constant iil) Write a note on spherical aberration
    • iv) Explain how Newton's rings can be used to measure the refractive index of a
    • v) Derive expression for work done by perfect gas in an isothermal transformation
    • vi) Comment on the limitations of the Van der Waals’ equation

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