GUJARAT TECHNOLOGICAL UNIVERSITY
BE - SEMESTER-I & II (OLD) EXAMINATION - SUMMER-2019
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Subject Code: 110011Date: 03/06/2019
Subject Name: Physics
Time: 10:30 AM TO 01:00 PM Total Marks: 70
Instructions:
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1. Attempt any five questions.2. Make suitable assumptions wherever necessary.
3. Figures to the right indicate full marks.
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Q.1 Describe the principle and the method of producing of ultrasonic waves by magnetostriction method. (07)
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Q.2 State any five factors affecting the acoustics of the building and give at least two remedies for each. (07)
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Q.3 (1) What is Zener diode? Explain with circuit diagram how a Zener diode operates in reverse bias condition. (04)
(2) Classify solid on the basis of energy band diagram. (03) -
Q.4 Define Miller indices. Obtain an expression for interplanar distance between two adjacent planes of Miller indices (h k l) in a cubic crystal system. (07)
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Q.5 Describe the construction of fiber optic cable and compare the advantage of fiber optic cable over metallic cable. (07)
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Q.6 (1) Give few important applications of superconductors. (04)
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(2) A hall has a volume of 1,20,000 m3. It has a reverberation time of 1.5 seconds. What is the average absorbing power of the surface if the total absorbing surface area is 25,000 m2? (03) -
Q.7 Deduce expression for electrical conductivity of conducting material and hence obtain Wiedemann-Franz law. (07)
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Q.8 Define superconducting material? List the properties of superconducting materials and explain in detail. (07)
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Q.9 What is Shape Memory Alloys (SMA)? Explain the temperature induced and stress induced transformations in detail. (07)
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Q.10 (1) List out the difference between step and graded index fibre. (04)
(2) Draw the planes (100), (111) (011). (03)--- Content provided by FirstRanker.com ---
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Q.11 List the various methods of Non Destructive testing and explain any one of them in details. (07)
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Q.12 (1) Explain the Hall effect. (04)
(2) Refractive index of core and cladding material are 1.623 and 1.599 respectively. Find out critical angle of a fiber. (03)--- Content provided by FirstRanker.com ---
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Q.13 Describe the construction and working of Nd-YAG laser with a suitable energy level diagram. (07)
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Q.14 (1) Describe any four applications of Laser. (04)
(2) Find the relaxation time of conduction electrons in a metal having resistivity 1.54 x 10-8 O.m and electron density 6.8x 1028 per m3. (03)--- Content provided by FirstRanker.com ---
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