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Posted By: Sanjana Member Level: Gold Posted Date: 12 Jun 2008
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2005 University of Mumbai(Bombay) Applied science-1 University Question paper
APPLIED SCIENCE -I (JAN. 2005)
1. (a) Explain how a charged particle fired into uniform electric field describes parabolic motions. (5)
(b) Define lattice parameter and explain how it is related with molecular weight and density in a single crystal. (5)
2. (a) Velocity of ultrasound waves in mild steel is 5.9 x 103 m/sec. The velocity ultrasound waves in brass measured by an ultrasound gauge meter, calibrated for mild steel is 4.8 x 103 m/sec. If thickness of brass plate measured by the ultrasound gauge meter is 12.8 cm. What is the real thickness ? (5)
(b) What is the De-Broglie wavelength of an electron which has been accelerated from rest through a potential difference of 300 volts ? (5)
3.(a) A water drop is charged by an electron and placed in electric field. What is the intensity of electric field required to keep the charged drop stationary if radius of drop is 10-7 m and density of water is 103kg/m3? (5)
(b) Explain wave particle duality and De-Broglie's Hypothesis. (5)
4.(a) Write short note on formation of potential barrier at p-n junction. (5)
(b) Calculate density of Ga As using following data: (5)
Atomic weight of Ga: 69 ; Atomic weight of As: 74
Lattice constant for Ga As = 5.6 x 10-8 cm ; Number of atoms per unit cell in GaAs = 4.
5. (a) Compare De-Broglie wavelength associated with following particles:
i) Mass of 60 micrograms traveling with velocity of 80 m/s.
ii) Mass of 8 x 10-27 kg and traveling with velocity of 13x10-4 km/sec. (5)
(b) Explain with neat diagrams, electrostatic or magnetostatic focusing of an electron beam in C.R.T. (5)
6. (a) Explain the following: (5)
i) Acceptor impurity. iv) Extrinsic Semiconductor,
ii) Donor impurity. v) Fermi level,
iii) Intrinsic semiconductor.
(b) Explain procedure to determine Miller Indices of Crystal plane which intercepts all the three axes. (5)
7. (a) An electric potential difference of 150 V is used to accelerated an electron beam. This beam is made to pass through uniform electric field established perpendicular to its path by a set of rectangular plates of length 10 cm. The distance between the plates is 1 cm. and potential difference between them is 15 V. Determine the angle of deflection of the electron beam. (5)
(b) Silver has FCC structure and it's atomic radius is 1.44 °A. Find the spacing of the (220), (200) and (111) planes. (5)
Section II
1. Attempt any five of the following: (10)
(a) Find out the temporary and permanent hardness in a sample of water with following impurities :
Mg CO3 = 29.2 ppm, MgSO4 = 36.0 ppm, CaCL2 = 22.2 ppm, MgCl2=142.5ppm.
(b) What is degree of hardness in water? How is it expressed ?
(c) What is polymerization ? What are the condition for polymerization ?
(d) What is neutralization number ? How is it helpful in accessing the quality of lubricant ?
(e) Define the terms: (a) Pollution (b) Pollutant.
(£) What are elastomers ? Mention few drawbacks of natural rubber.
2. (a) Explain the theory of Lime-Soda process with special reference to the different functions of lime and soda. (6)
(b) With the help of a suitable example explain condensation. Polymerization. Name any two-thermosetting resins prepared by using condensation Polymerization. (4)
3. (a) A water sample on analysis gave the following data: (6)
1. MgCl2 95 ppm 4. H2SO4. 49 ppm
2. CSO4 272 ppm 5. SiO2 4 ppm
3. MgSO4 120 ppm
Calculate lime and soda requirement in kg for the softening of 10,000 liters if it is given that lime is 85% pure and soda is 90% pure.
(b) Explain the mechanism of lubrication which is provided for delicate instruments and machine. (4)
4.(a) Write the synthesis, properties and uses of any one of the following:
i) Phenol formaldehyde ii) Urea formaldehyde. (6)
(b) What are the primary air pollutants ? State their source. How do they affect life on earth ? (4)
5. (a) What are scales and sludges? What are their disadvantages? How can scale be prevented by Phosphate conditioning ? (6)
(b) What is vulcanization? Explain the mechanism of vulcanization with the help of suitable example. How is it helpful in removing the drawbacks of natural rubber ? (4)
6. (a) Write short note on any two of the following: (6)
i) B. O. D. ii) C.O. D. iii) Photochemical Smog.
(b) In determination of saponification value of vegetable oil 5 gm of oil sample was refluxed with 50 ml of alcohol and 50 ml of 0.5 N alcoholic KOH solution. To get the end point 20 ml of 0.5 N HCI was required. The blank reading was 52 ml. Find the saponification value of oil. (4)
7. (a) What are Zeolities ? Explain theory, procedure and limitations of Zeolite process with the help of neat diagram. (6)
(b) Give brief account of Semi-Solid lubricants. (4)
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