Enrolment No.
GUJARAT TECHNOLOGICAL UNIVERSITY
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BE - SEMESTER-I & II (NEW) EXAMINATION - SUMMER-2019Subject Code: 2110011 Date: 03/06/2019
Subject Name: Physics
Time: 10:30 AM TO 01:00 PM Total Marks: 70
Instructions:
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- Question No. 1 is compulsory. Attempt any four out of remaining Six questions.
- Make suitable assumptions wherever necessary.
- Figures to the right indicate full marks.
Q.1 (a) Objective Question (MCQ) Mark
Unit of Electric Flux Density = 07
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(a) C/meter’> (b) C/meter (c) meter/Coulomb (d) C%/ meter
Curie’s Law is
(a) M=T/C (b) T=M/C (c) M=C/T (d)C=T/0
The Dimensional Formula of Surface Tension is
(a) MLT"! (b) MLT2 (c) ML!T? (d) ML!T"!
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Power is measured in
(a) Volts (b) Amperes (c) Joules (d) Watts
Kirchhoff’s law is applicable to
(a) AC circuits only (b) DC circuits only
(c) AC & DC circuits (d) Passive Networks only
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Inertia is
(a) Property of matter (b) type of foree
(c) Speed of an object (d) None of these
Temporary magnets are used in
(a) Motors (b) Generators .(¢) Loud Speaker (d) All of above
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(b) Objective Question (MCQ) 07
Which physical parameter is measured by voltmeter?
(a) Current (b) Voltage (c) Resistance (d) Potential Difference
The rate of change of momentum is
(a) Acceleration (b) Momentum (c)Force (d) Velocity
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Interactive force between two charges is given by Law.
(a) Newton’s (b) Coulomb’s (c) Biot-savart (d) Faraday’s
Which of this quantity is unit less?
(a) Sound absorption (b) Reverberation time
(c) Absorption coefficient (d) Loudness
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What is full form of SONAR?
(a) Sound Navigation & Routine (b) Sound Navigation & Ranging
(c) Submarine Navigation & Range (d) Submarine Navigation & Ranging
The Ratio of Einstein’s coefficients A21/Biais
(a) 8phv3/c? (b) 6phvi/cd (c) 6phvi/c® (d) 8phvi/c?
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Persistence current is given by
(a) I=4pRH. (b) [=2pRH. (c) [=2p’RH. (d) l=6xRH,
Q.2 (a) A Josephson junction has a voltage of 9 pV across its terminals. Calculate the 03
frequency of radiation generated by it. Given h = 6.626x10-34
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(b) Distinguish between type-I & type-II superconductors. 04
(c) Explain Meissner Effect. 03
(d) Write a short note on SQUID. 04
Q.3 (a) A laser beam has a power of 50mW. It has an aperture of 5 x 10-5m and 04
wavelength 7000 A. The beam is focused with a lens of focal length of 0.2m.
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Calculate the areal spread and intensity of the image.(b) Explain Laser production from Nd:YAG. 07
(c) Write Properties of LASER. 03
Q.4 (a) Write short note on Acoustic Grating method. 04
(b) Calculate thickness of quartz plate designed to produce ultrasonic waves at 1 03
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mode of vibration with the frequency of 3MHz. Young’s modulus of quartzcrystal is 85 GPa and density of material is 2650kg/m2.
(c) Explain Magnetostriction method for ultrasonic sound generation. 07
Q.5 (a) The dielectric constant of diamond is 1.43. Calculate permittivity and electric 03
susceptibility of diamond.
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(b) What is Local Field? Derive expression for Claussius-Mosotti equation. 04
(c) What is dielectric material? Distinguish between a dielectric material and 07
insulator. Explain different types of dielectric polarization?
Q.6 (a) A paramagnetic material has magnetic field intensity of 950 A/m. if the 04
susceptibility of ‘material at room temperature is 2.65x10-7. Evaluate the
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magnetization and flux density of material.(b) What are metallic glasses? Write its applications. 03
(c) What are Hard & Soft magnets? Classify Paramagnetic, Ferro-magnetic & Dia 07
magnetic materials in detail.
Q.7 (a) Write short note on Quantum Confinement. 04
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(b) What are Shape Memory Alloys? Write its applications 04
(c) List the factors affecting acoustics of building. 02
(d) Write disadvantages of Nano materials. 04
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