Download GTU (Gujarat Technological University) BE/BTech (Bachelor of Engineering / Bachelor of Technology) 2019 Winter 1st And 2nd Sem New And Spfu 2110011 Physics Previous Question Paper
GUJARAT TECHNOLOGICAL UNIVERSITY
BE - SEMESTER ? I & II (NEW) EXAMINATION ? WINTER 2019
Subject Code: 2110011 Date: 02/01/2020
Subject Name: Physics
Time: 10:30 AM TO 01:00 PM Total Marks: 70
Instructions:
1. Question No. 1 is compulsory. Attempt any four out of remaining Six questions.
2. Make suitable assumptions wherever necessary.
3. Figures to the right indicate full marks.
Q.1 Objective Question (MCQ)
Mark
(a) 07
1. The polarization of a solid which contains N number of particles per unit volume is
equal to
(a) Pe = N?E (b) Pe = 2N?E
(c) Pe = N?
2
E (d) Pe = N?
2
E
2
2. SQUID is an application of
(a) Semiconducting materials (b) Nano materials
(c) Superconducting materials (d) Bio materials
3. In Nd:YAG LASER ___________ kind of pumping is used.
(a) inelastic atomic collision (b) optical pumping
(c) direct electron excitation (d) none of these
4. The following are the structure of CNT
(a) Chiral (b) Zigzag
(c) Armchair (d) all of these
5. Hysteresis loop for hard ferromagnetic substances is___________.
(a) broad (b) narrow
(c) cannot say (d) none of these
6. The high temperature stable phase of SMA is called
(a) Austenite (b) Martensite
(c) Nitiosite (d) None of these
7. SONAR means ________________.
(a) Sound Negative and Ranging (b) Sound Navigation and Radiation
(c) Sound Negative and Radiation (d) Sound Navigation and Ranging
(b) 07
1. Which Of the following is Weber-Fechner?s Law?
(a) L = K log10I (b) I = K log10L
(c) L
2
= K log10I (d) I
2
= K log10L
2. The current require to destroy the superconductivity is equal to
(a) IC = 4?r
2
HC (b) IC = 2?rHC
(c) IC = 2?HC (d) IC = 2?rH0
3. Dielectric materials can also be termed as
(a) Conductors (b) Semiconductors
(c) Insulators (d) Superconductors
4. Which one is not having permanent dipoles in absence of magnetic field?
(a) Paramagnetic material (b) Ferromagnetic material
(c) Ferrimagnetic material (d) Diamagnetic material
5. LASER light consists of ________________.
(a) Electron flow (b) Cosmic rays
(c) UV rays (d) Coherent photons
6. ______________ is the process to synthesize Metallic Glass.
(a) ball milling (b) CVD
(c) plasma arching (d) melt spinning technique
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Seat No.: ________ Enrolment No.___________
GUJARAT TECHNOLOGICAL UNIVERSITY
BE - SEMESTER ? I & II (NEW) EXAMINATION ? WINTER 2019
Subject Code: 2110011 Date: 02/01/2020
Subject Name: Physics
Time: 10:30 AM TO 01:00 PM Total Marks: 70
Instructions:
1. Question No. 1 is compulsory. Attempt any four out of remaining Six questions.
2. Make suitable assumptions wherever necessary.
3. Figures to the right indicate full marks.
Q.1 Objective Question (MCQ)
Mark
(a) 07
1. The polarization of a solid which contains N number of particles per unit volume is
equal to
(a) Pe = N?E (b) Pe = 2N?E
(c) Pe = N?
2
E (d) Pe = N?
2
E
2
2. SQUID is an application of
(a) Semiconducting materials (b) Nano materials
(c) Superconducting materials (d) Bio materials
3. In Nd:YAG LASER ___________ kind of pumping is used.
(a) inelastic atomic collision (b) optical pumping
(c) direct electron excitation (d) none of these
4. The following are the structure of CNT
(a) Chiral (b) Zigzag
(c) Armchair (d) all of these
5. Hysteresis loop for hard ferromagnetic substances is___________.
(a) broad (b) narrow
(c) cannot say (d) none of these
6. The high temperature stable phase of SMA is called
(a) Austenite (b) Martensite
(c) Nitiosite (d) None of these
7. SONAR means ________________.
(a) Sound Negative and Ranging (b) Sound Navigation and Radiation
(c) Sound Negative and Radiation (d) Sound Navigation and Ranging
(b) 07
1. Which Of the following is Weber-Fechner?s Law?
(a) L = K log10I (b) I = K log10L
(c) L
2
= K log10I (d) I
2
= K log10L
2. The current require to destroy the superconductivity is equal to
(a) IC = 4?r
2
HC (b) IC = 2?rHC
(c) IC = 2?HC (d) IC = 2?rH0
3. Dielectric materials can also be termed as
(a) Conductors (b) Semiconductors
(c) Insulators (d) Superconductors
4. Which one is not having permanent dipoles in absence of magnetic field?
(a) Paramagnetic material (b) Ferromagnetic material
(c) Ferrimagnetic material (d) Diamagnetic material
5. LASER light consists of ________________.
(a) Electron flow (b) Cosmic rays
(c) UV rays (d) Coherent photons
6. ______________ is the process to synthesize Metallic Glass.
(a) ball milling (b) CVD
(c) plasma arching (d) melt spinning technique
7. NDT means ________________.
(a) Nano Density Test (b) Nano Detection Test
(c) Non Demanding Test (d) Non Destructive Test
Q.2 (a) Calculate the electronic polarisability of an isolated Se atom. The atomic radius of a
Se atom is 0.12 nm. Given ?0 = 8.85 ? 10
-12
F/m.
03
(b) Explain important properties of superconducting materials. 04
(c) List various polarization mechanisms in dielectric materials. Derive an expression
for atomic polarizability ?e.
07
Q.3 (a) A magnetic material has a magnetization of 2300 Am
-1
and produces a flux density
of 0.00314 Wbm
-2
. Calculate the magnetizing force and the relative permeability of
the material. Given permeability of the free space = 4? ? 10
-7
H/m.
03
(b) Give the properties and applications of dielectric materials. 04
(c) Write general properties of diamagnetic, paramagnetic and ferromagnetic materials. 07
Q.4 (a) The ultrasonic pulse echo method is employed to detect possible defects in a steel
bar of thickness 40 cm. If the pulse arrival times are 40 ?s and 80 ?s, find the
distance of defect from the end of the bar at which the ultrasonic pulse enters the
bar.
03
(b) What is the principle of magnetic recording? Discuss magnetic storage in magnetic
hard disk.
04
(c) What are the factors affecting acoustics of the buildings and their remedies? 07
Q.5 (a) The critical temperature for a metal with isotopic mass 199.5 is 4.185 K. Calculate
the isotopic mass if the critical temperature falls to 4.133 K.
03
(b) Explain the classification of optical fibres based on refractive index profile. 04
(c) Describe the construction and working of Nd:YAG LASER with a suitable energy
level diagram.
07
Q.6 (a) An optical fibre has a numerical aperture of 0.20 and a cladding refractive index of
1.55. Determine the acceptance angle for the fibre in water which has a refractive
index of 1.33.
03
(b) Write short note on Lithium cell. 04
(c) List out techniques used in synthesis of Nanomaterials. Discuss any two of them in
detail.
07
Q.7 (a) What should be the total absorption and average absorption coefficient in a hall of
volume 10000 m
3
and total surface are of 1400 m
2
if it is required to have
reverberation time of 1.4 seconds.
03
(b) Write note on electron confinement. 04
(c) Explain temperature induced and stress induced transformation in SMA in details. 07
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This post was last modified on 20 February 2020