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                        LOYOLA COLLEGE (AUTONOMOUS), CHENNAI – 600 034

M.Sc. DEGREE EXAMINATION – CHEMISTRY

AD 25

THIRD SEMESTER – NOV 2006

CH 3875 – MATERIAL SCIENCE

 

 

Date & Time : 06-11-2006/9.00-12.00   Dept. No.                                                       Max. : 100 Marks

 

 

PART – A

Answer all the questions                                  (10 x 2 = 20)

 

1. What are “glide planes”?
2. Give the expression for Brinell Hardness number.
3. Mention few applications of single crystals.
4. List the thermodynamical properties that can be measured using TG/DSC methods.
5. Write a note on “electron charge density maps”.
6. What is Meissner effect?
7. What is Hall effect?
8. What is breakdown diode? What are its uses?
9. What is Josephson’s effect?
10. What are ferrites? What is the role of this compound in super conductivity?

 

 

PART – B

 

Answer any eight questions                                 (8 x 5 = 40)

 

11. Outline the principle, instrumentation and applications of thermogravimetric method.
12. State Brags’s law. Discuss the powder method of X-ray diffraction.
13. With neat sketch explain the Bridgman-Stockbarger method of crystal growth from melt.
14. What are Miller indices? Illustrate their formation in different planes of a cube.
15. Discuss the role of modulus as an essential parameter in the structural design.
16. Describe the slow evaporation technique of growing crystals with Manson jar apparatus.
17. How are cooper pairs formed? Explain BCS theory of superconductivity.
18. Describe the role of TaS₂ in high temperature superconductivity.
19. Describe domain theory to account for the Hysteresis behaviours of magnetic materials.
20. Write short notes on a) LED b) Photo voltaic cell.
21. Explain qualitatively how a p-n junction functions as a rectifier.
22. Distinguish between Zenner breakdown and avalanche breakdown.

 

 

 

PART – C

 

Answer any four questions                                                 (4 x 10 = 40)

 

23. Describe (i) Chemical reaction (ii) Chemical reduction (iii) Complex decomplexion and (iv)    solubility reduction methods of growing single crystals by gel.
24. Outline the essential features of rubber like elasticity. Obtain the equation of            state for           the rubbering material.
25. What is meant by symmetry operation? Describe point group and space group        symmetry        elements with necessary diagram.

26. Explain the working of a p-n junction. Discuss forward and reverse biasing of p-n junction.
27. Describe the behaviour and properties of conductors, insulators and semiconductors on the    basis of band theory.
28. Write short notes on a) 1-2-3 oxides b) Chevral phases c) hard and soft magnetic materials.

 

 

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LOYOLA COLLEGE (AUTONOMOUS), CHENNAI – 600 034

M.Sc. DEGREE EXAMINATION – CHEMISTRY

GH 41

THIRD SEMESTER – APRIL 2008

CH 3875 – MATERIAL SCIENCE

 

 

 

Date : 30-04-08                  Dept. No.                                        Max. : 100 Marks

Time : 9:00 – 12:00

 

PART A

Answer all the questions                                                                   10 ´ 2 = 20 marks

1. Illustrate proper and improper axes of symmetry.
2. Explain mirror plane with an example.
3. List the advantages of neutron diffraction.
4. Mention the applications of single crystals in science and technology.
5. Write a note on deformation by slip.
6. What are Cheveral phases? Give one example.
7. What is Josephson Effect?
8. ‘Li⁺ doped NiO shows a high conductivity’. Explain
9. What is piezoelectric effect?
10. What are tungsten bronzes?

PART B

Answer any EIGHT questions                                                         8 ´ 5 = 40 marks

1. Discuss the working of DTA instrument with a neat sketch and explain its
   applications.
2. Discuss the importance of crystal pulling techniques with the help of
   Czochralski method.
3. Explain the effect of grain size on the dislocation motion.
4. Give a brief introduction to crystal planes and directions. How are the crystal planes indexed?
5. With a neat diagram, explain different symmetry elements and the
   combination of symmetry elements.
6. Explain the role of modulus as one of the vital parameters in the design of
   structures.
7. Write a note on tetracyanoplatinate compounds.
8. Write a note on graphite intercalation compounds
9. Describe the Honda cell experiment to decompose water into its elements.
10. Write a note on metal oxide based semiconductors.
11. Discuss the shape memory alloys.
12. Discuss the behaviour of magnetoresistance materials.

 

PART C

Answer any FOUR questions                                                          4 ´ 10 = 40 marks

23. What are Baravis lattices? Discuss their characteristics supported by neat
    sketches and tables.

1. Outline the growth of single crystals by Gel technique and discuss the
   experimental procedure for 1) Chemical reaction method 2) Solubility
   reduction method and 3) Complex and Decomplex methods.
2. What is a rubbery material? Derive the expression for equation of state for
   the rubbery material.
3. Discuss the Li⁺ intercalated TiS₂ type of materials for battery applications.
4. Discuss the structure and superconductivity behaviour of high temperature superconductors.
5. Discuss the domain theory and hysteresis loop to explain the ferromagnetic behaviour.

 

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LOYOLA COLLEGE (AUTONOMOUS), CHENNAI – 600 034

DB 29

M.Sc. DEGREE EXAMINATION – CHEMISTRY

THIRD SEMESTER – November 2008

    CH 3875 – MATERIAL SCIENCE

 

 

 

Date : 10-11-08                 Dept. No.                                        Max. : 100 Marks

Time : 9:00 – 12:00

PART A

Answer all the questions.                                                                                  10 x 2 = 20

1. What are proper and improper axes?
2. Mention the steps involved in the determination of Miller Indices.
3. State and explain Bragg’s law of X- ray diffraction.
4. Write a note on work hardening and dynamic recovery.
5. Discuss the role of modulus as an essential parameter in design.
6. How is Na_xTaS₂ prepared?
7. What are n- and p-type semiconductors? Give an example for each.
8. Define Hall effect.
9. Draw the plot of variation of susceptibility with temperature for ferro and ferrimagnetic materials.
10. Give any two applications of shape memory alloys.

PART B

Answer any eight questions.                                                                                8 x 5 = 40

11. Mention the advantages of SEM over electron microscope. Discuss the working
    principle of SEM with neat diagram.
12. Describe the Bridgman-Stockberger melt method of crystal growth.
13. Discuss the disadvantages in using polymer materials and explain how the composite
    materials will be more useful in structural design?
14. Discuss in detail the TG method of thermal analysis with neat sketch.
15. Describe neutron diffraction method for crystal structure determination.
16. Write notes on mirror plane, glide plane and screw axis.
17. Write short notes on the following:
18. a) Second harmonic generators
19. b) optical mixing
20. Discuss the critical magnetic field and critical temperature of superconducting

compounds using Meissner effect.

 

19. Describe the structure of Na⁺ in β – alumina.
20. What are intercalation compounds? Explain with an example.
21. What are Cooper pairs? How is BCS theory helpful to describe the

superconductivity?

22. What are pyroelectric materials? Give any three applications.

PART C

Answer any four questions.                                                                              4 x 10 = 40

 

23. Outline the gelling mechanism and the experimental procedure to harvest crystals in a
    Gel by chemical reaction and solubility reduction techniques.
24. Describe the experimental set up to determine crystal structure by powder XRD
    method.
25. Explain different types of elastic behaviour and discuss the atomic model of elastic
    behaviour.
26. a) Why the ferromagnetic materials exhibit hysteresis? Explain.
27. b) How is water photoelectrocatalytically splitted using SrTiO₃ electrode? (5+5)
28. Describe the preparation and structure of one, two and three dimensional compounds
    with one example for each.
29. a) Explain any two uses of GMR materials.
30. b) What are soft and hard magnets? Give any five differences.    (5+5)

 

 

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LOYOLA COLLEGE (AUTONOMOUS), CHENNAI – 600 034

M.Sc. DEGREE EXAMINATION – CHEMISTRY

SECOND SEMESTER – NOVEMBER 2012

CH 2901 – INSTRUMENTAL METHODS OF CHEMICAL ANALYSIS

 

 

Date : 06/11/2012            Dept. No.                                        Max. : 100 Marks

Time : 1:00 – 4:00

 

PART A

Answer all the questions:                                                                   10×2=20 Marks

 

1. Define molarity.
2. State Beer Lambert’s law.
3. Calculate the pH of 0.01N NaOH.
4. What is Buffer solution? Give an example.
5. Mention the principle of HPLC.
6. State Bragg’s law.
7. Give an example for Mc-Lafferty rearrangement.
8. Mention the significance of finger print region in IR spectroscopy.
9. Define gyroscopic motion.
10. How many ml of conc.HCl (density = 1.18 g/ml, 36.0 wt% HCl, MW = 36.5) should be diluted to 1litre to produce a 0.100 M solution?

 

PART B

Answer any eight questions:                                                                        8×5=40 Marks

 

11. What are the requirements of a primary standard?
12. How is sulphate determined by turbidometry?
13. Discuss the significance of PMT.
14. Explain the analysis of riboflavin by spectroflurometry.
15. Write a short note on circular dichroism with an example.
16. How is ion selective electrode helpful in the analysis of fluoride in drinking water?
17. Draw and explain the working principle of a thermal conductivity detector.
18. Briefly explain the instrumentation of EPR.
19. Explain the fragmentation pattern of decane.
20. Discuss the absorption bands of functional groups in IR spectrum.
21. Explain the method of single crystal XRD determination.
22. Write short notes on detectors used in HPLC.

 

 

PART C

Answer any four questions:                                                                4×10=40 Marks

 

23. Draw and explain the working principle of dark beam spectrophotometer.
24. Briefly discuss the instrumentation of AAS.
25. a) Explain the instrumentation of turbidometry.
26. b) How is phosphate determined by turbidometry.
27. Draw the block diagram and explain the instrumentation of GC.
28. Explain the fragmentation pattern of
29. a) benzyl alcohol
30. b) pentanoic acid
31. Briefly explain the instrumentation of NMR with a block diagram.

 

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