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Sem - I Jun 2008 Pattern Applied Science - I

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Total No. of Questions : 12] [Total No. of Printed Pages : 4 [3661]-102 F. E. (Semester - I) Examination - 2009 APPLIED SCIENCE - I (June 2008 Pattern) Time : 3 Hours] [Max. Marks : 100 Instructions : (1) Answer any three questions from each section. (2) Answers to the two sections should be written in separate answer-books. (3) Black figures to the right indicate full marks. (4) Neat diagrams must be drawn wherever necessary. (5) Use of logarithmic tables, slide rule, Mollier charts, electronic pocket calculator and steam tables is allowed. (6) Assume suitable data, if necessary. 10 34 J.sec. Constants : h = 6.63 10 31 kg. m = 9.1 10 19 C e = 1.6 c=3 108 m/sec. SECTION - I Q.1) (A) (B) (C) Q.2) (A) (B) (C) [3661]-102 Define and explain the Vulcanization of Natural Rubber. Classify the Polymer on the basis of Heat Effect and Number Monomers. Write short note on Biodegradable Polymer. OR Explain the Compounding of Polymer. Give the polymerization reaction, properties and applications of any two : (1) Polysturene (2) PF Resin (3) Silicon Rubber (4) ABS Plastic [06] [06] [05] [06] [06] Give the difference between Addition Polymerization Reaction and Condensation Polymerization Reaction. [05] 1 P.T.O. Q.3) (A) (B) What are the types of Symmetries in Crystal ? Discuss them with respect to Cubic Crystal. [06] Define the following terms : [06] (1) Unit Cell (2) Anisotropy (3) Co-ordination Number (4) Radius Ratio (C) (1) Calculate APF for BCC. [03] (2) Draw the following planes in simple Cubic System : (111) and (110) [02] [04] (2) Give the Structure of Polypyrrole and justify its conducting nature. Q.4) (A) OR (1) Explain the structure and properties of Fullerene. [03] (B) What is Point Defect ? What are their types and explain the Point Defect in Ionic Crystal. [06] (C) At what glancing angle, would the first order diffraction from (110) plane of KCl can be observed by using X-ray of wavelength 0.715 Ao. The Unit Cell dimension is 3.1 Ao. [04] How are the pH of titration mixture calculated at various stages during weak acid - strong base ? [06] Q.5) (A) (B) Define : [06] (1) Normality (2) Molarity (3) Equivalence Point (4) Primary Standard (5) Indicator (6) End Point (C) Calculate the equivalent weight of K2Cr2O7 and Na2S2O3.5H2O. (Given Mole ut. wt. K2Cr2O7 = 294 and Na2S2O3 . 5H2O = 248) [04] OR [3661]-102 2 Contd. Q.6) (A) What are types of Complexometric Titration ? Explain any one of them with suitable example. [06] (B) Write note on Redox Titration. [06] (C) 20ml of standard solution of 0.04m KCl takes 35.5 ml of AgNO3 from burette, during standardization of the AgNo3. 100ml of water sample requires 12.5 ml of the AgNO3 solution. Calculate the quantity of chloride ions per liter in the given water sample. [04] SECTION - II Q.7) (A) Derive the expression for brightness and darkness for a monochromatic light beam reflected from a thin parallel film of transparent material. [07] (B) Explain the motion of an electron in a transverse magnetic field. Obtain an expression for the displacement produced. [06] (C) Two optically plane glass strips of length 10cm are placed one over the other. A thin foil of thickness 0.010mm is introduced between the plates at one end to form an air film. If the light used has wavelength 5900 Ao, find the separation between consecutive bright fringes. [04] OR Q.8) (A) Prove that in Newton s Rings by reflected light the diameters of bright rings are proportional to the square root of the odd natural numbers. [06] (B) What is Velocity Selector ? How this principle is used in Bainbridge Mass Spectrograph to determine the mass of the isotopes ? [07] (C) Electrons accelerated by a potential difference of 200V enter in an electric field at an angle of 60o with the normal to the interface of the higher potential region and gets refracted at an anlge of 45o with the normal. Find the potential difference between the plates. [04] [3661]-102 3 P.T.O. Q.9) (A) (B) What is Ultrasonics ? Explain how Piezo-electric Effect can be used for generating Ultrasonic Waves. [07] Explain : (1) Diffraction of Light (2) Rayleigh s Criterion of Resolution (C) [06] An ultrasonic pulse of frequency 80 kHz is sent down towards the seabed. The echo is recorded after 0.7 sec. If the velocity of sound in sea water is 1500 m/s. Calculate the depth of the sea and the wavelength of the pulse. [04] OR Q.10) (A) Obtain the conditions for principal maximum and minimum in [07] Fraunhofer diffraction due to a single slit. (B) Describe any two engineering applications of Ultrasonic Waves. [06] (C) Find the maximum value of resolving power of a diffraction grating 3 cm wide having 5,000 lines per cm if the wavelength of light used is 5890Ao. [04] Q.11) (A) Define Plane of Polarisation and Plane of Vibration. Explain the phenomenon of double refraction in calcite. [06] (B) What is meant by Nuclear Fusion ? Give an account of CarbonNitrogen Cycle in Fusion Reaction. [06] (C) Two polarising plates have polarising directions parallel so as to transmit maximum intensity of light. Through what angle must either plates be turned if the intensity of the transmitted beam [04] is one third the intensity of the incident beam. OR Q.12) (A) Explain the working of Betatron. Obtain the Betatron Condition. [06] (B) What are Retardation Plates. Deduce the thickness of a quarter wave plate for a given in terms of its refractives index. [06] (C) If the frequency of the a cyclotron is 9 MHz, required to accelerate particles to be 6.643 a.c. potential applied to the dees of calculate the magnetic flux density - particles. Given the mass of -27 10 kg. [04] [3661]-102/4

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