University of Mumbai 2008 B.Tech APPLIED SCIENCE-I - - Model - Set 3 - Question Paper

APPLIED SCIENCE-I - University of Mumbai - Model ques. paper

part I

1.(a) State the basis and lattice kind for the subsequent crystal structures:
(i) Iron (ii) Diamond (hi) Sodium chloride. (6)
(b)An election with initial horizontal velocity ux enters vertical uniform electric field Ey. Show that the trajectory of electron within the field region is a parabola. (4)
(c) Draw subsequent in a cubic unit cell:- (4)
Planes (121), (110)
Directions (120), (111).
2.(a) explain motion of electrons in non-uniform electric field. Hence discuss the principle of electrostatic focusing. (8)
(b)What is octahedral void? find critical radius ratio for octahedral configuration, (ligancy 6). (6)
(c)In a CRT employing magnetic deflection, length of the field region along the axis is five cm. Intensity of magnetic field is five x 10-5 wb/m2. Distance of screen from center of the field region is 20cm. compute deflection of electron beam if final anode voltage is 500 volt. provided e = 1.6x10-19 C,me = 9.1x10-31 kg. (4)
3.(a) State direct and inverse piezoelectric effect. discuss with neat- tagged diagram the construction and working of piezoelectric oscillator. (8)
(b)Calculate kinetic energy of an electron whose de' Broglie wavelength is the identical as that of 100 keV x-ray photon. provided h = 6.63 x 10-34 J.S, C = 3x 108 m/s, e = 1.6 x 10-19 C and me = 9.1 x 10-31 kg. (6)
(c) State de' Broglie's relation and show that Bohr's 2nd postulate follows logically from de' Broglie's hypothesis. (4)
4. Write short notes on any 3 of the following:- (18)
(a) Quartz - A piezoelectric material.
(b) Applications of ultrasonic waves.
(c) Pn junction diode and its characteristics.
(d) Basic transistor action using common base configuration.
(e) Concept of Fermi level and Fermi Dirac distribution function.
(f) Miller indices and crystal lattice planes.


part II

(At. wts. : H = one ; C = 12, 0 = 16, Na = 23, Mg = 24, CI = 35.5, Ca = 40, S = 32, Al = 27, Fe = 56.)
6. ans any 6 of the following:- (18)
(a) discuss with equations role of coagulants in cold lime soda process.
(b) Explain condensation polymerization with suitable examples.
(c) Why does graphics act as a good lubricant on the surface of moon.
(d) Why 'Hydrazine' is an ideal chemical employed for degassing water.
(e) Explain the term acid rains.
(f) Give preparation, properties and uses of polyurethane rubber.
(g) Discuss the catgon conditioning of water.
(h) six gms of an oil was saponified with 50 ml 0.5 N alcoholic KOH. After refluxing for two hrs, the mixture was titrated by 25 ml of 0.5 N HCI. obtain saponification value of oil.
7. (a) discuss with neat sketch and chemical reaction the zeolite-permutit process ibr softening of water. elaborate the advantages and disadvantages of this process. J6)
(b)Explain the process of vulcanization and its significance? Compare the properties of raw rubber and vulcanized rubber? (6)
(c)Define flash point and fire of lubricants and provide its significance. (4)
8.(a) compute the volumes of time(86% pure) needed and soda (90% pure) needed for softening 25,000 litres water having subsequent analysis:- (7)
HCI = 12.5 mgs/lit, CaC03= 35.2 mgs/lit Na2SO4 = 8.8 mgs/lit, AL2 (S04)3 = 33.3 mgs/lit MgCl2 = 7.8 mgs/lit, Fe2O3 = 18.6 mgs/lit.
(b) What ingredients are used in the compounding of plastics? elaborate their functions? (5)
(c) Write a note on blended oils. (4)
9.(a) Enumerate the methods of control water pollution. explain any 1 in detail. (6)
(b)0.28 gm of CaCO3 was dissolved in HCI and the solution made up to one litre with distilled water. 100 ml of the above solution needed 28 ml of EDTA solution, 100 ml of hard water sample needed 33 ml of EDTA solution. After boiling 100 ml of this water cooling and filtering and then titration needed 10 ml of EDTA solution. compute every kind of hardness, of water. (6)
(c) What i s meant by fabrication of plastic? discuss Extrusion moulding with neat sketch. (4)

Earning:   Approval pending.