Engineering FE Engineering Common Sem 1 Applied Physics Dec 2019 CBSGS Question Paper - Mumbai University | munotes

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Questions asked in this paper

Q2 Attempt any Three questions from the remaining questions Nos.2 to 6 marks
Q4 to the right indicate marks
Q1 Attempt Any Five
- a) Define the following terms 1) Space lattice 2) Unit cell 3) lattice point 03
- b) between insulators, conductors and semi-conductors in terms of their 03
- c) What are liquid crystals? List the various types of liquid crystals. 03
- d) What are polar and non-polar dielectrics? 03
- e) Define relative permeability and susceptibility. Write the relation between them. 03
- f) | Aclassroom has dimensions the reverberation time is 3.5sec.Calculate 03 the total absorption of its surfaces and the average absorption coefficient
- g) are ultrasonic waves? State the direct piezoelectric effect. 03 Show that Fermi level in intrinsic semiconductor lies at the centre of the forbidden 08
- b) the following: (i) (2 (ii) [2.0 1] Gii) a 2 1) Calculate the packing 07 efficiency for Body centered cubic cell? Explain various stages of hysteresis and give the significance of hysteresis 08
- b) Deduce the Braggs law for the diffraction of in crystals. 07
Q4 Foracubic structure ina crystal, derive an expression for interplanar spacing between the planes with miller indices 5 marks
- b) What is potential barrier? How is it a p-n junction? 05
- c) Derive Clausius —Masotti relation for non-polar dielectrics. 05
Q5 a) Copperhas F.C.C. structure and the atomic radius is 1.28 A. Calculate its density. ( At wt = 63.54, Na = 6.023 X 1073 ) 5 marks
- b) Acopper strip 2cm wide and Imm thick is placed in a magnetic field with B=1.5 05 current of 200.A is set up in the strip, calculate Hall voltage that appears across the trip. Given Ry =6 x 107
- c) in detail the conditions necessary for good acoustical design of an auditorium 05
Q6 real crystals? Differentiate between Frenkel and Schottky defect the terms:1) mobility conductivity. 05 Find the resistivity of intrinsic germanium at 300K.Given the density of carriers as 2.5 5 marks
- c) Find the natural frequency of vibration of quartz plate of thickness 05 Young’s modulus for quartz is 8 x Density of quartz is 2650

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