Question 1
(a)
Define Ductility, Brittleness and Elasticity.
3 Marks
(b)
Define Spontaneous and Stimulated emission.
4 Marks
(c)
Derive an expression for Twisting couple in a wire.
7 Marks
Gujarat Technological UniversitySummer 2023 Examination
GTU 3110011 Physics Summer 2023 Paper Solution & PDF
B.E. · Common Engineering · Semester 1 · Subject Code: 3110011
Total Marks70 MarksExternal theory exam
Passing Marks23 Marks33% minimum cutoff
Exam Duration2.5 Hours10:30 AM – 1:00 PM
Paper Structure5 QuestionsWith internal OR choices
Question 2
(a)
Define simple harmonic motion (SHM). Give Any two examples of it.
3 Marks
(b)
Find the acceleration of particle performing simple harmonic motion when it is at 0.6 m from its mean position. The time period of S.H.M. is 0.05 sec. also calculate maximum velocity if the amplitude of S.H.M. is 2 m.
4 Marks
(c)
Derive an expression for depression of cantilever.
7 Marks
OR OPTION
(c)
Explain classification and properties of sound absorbing material.
7 Marks
Question 3
(a)
Calculate Poisson’s ratio and the rigidity modulus of copper using following data : Young’s modulus 10.5 x 1010 Nm-2 and the bulk modulus of copper 14.3 x 1010 Nm-2.
3 Marks
(b)
Write a short note on I shaped girders.
4 Marks
(c)
Explain construction and working of He – Ne laser.
7 Marks
OR OPTION
(a)
An ultrasonic source of 0.09 MHz sends down a Pulse towards the seabed which returns after 0.55 sec. The velocity of sound in water is 1800 m/s. Calculate the depth of the sea and wavelength of pulse.
3 Marks
(b)
Compare Type –I and Type – II superconductors. (Any four points).
4 Marks
(c)
Explain in detail Magnetostriction method for production of ultrasonic waves.
7 Marks
Question 4
(a)
Find the frequency of the first and second modes of vibration for a quartz crystal of piezoelectric oscillator. The velocity of longitudinal waves in quartz is 5.5 x 103 m/s. thickness of quartz crystal is 0.05 m.
3 Marks
(b)
Explain Josephson junction.
4 Marks
(c)
Discuss Ultrasonic flaw detector method for NDT, with its advantages and limitations.
7 Marks
OR OPTION
(a)
The critical temperature of mercury with isotopic mass 199.5 is 4.185 K. calculate its critical temperature when its isotopic mass is 203.4.
3 Marks
(b)
Compare Non destructive test (NDT) with destructive test (DT). (any four points)
4 Marks
(c)
Explain basic components of laser generation with diagram. Also give types of laser.
7 Marks
Question 5
(a)
Calculate the critical current for a wire of Pb having a diameter of 1 mm at 4.5 K. The critical temperature for Pb is 7.2 K and Hc(0) = H(0) = 6.5 x 104 A/m.
3 Marks
(b)
Define pumping with its types.
4 Marks
(c)
Explain Meissner effect. Hence prove that superconductors are perfect diamagnetic materials.
7 Marks
OR OPTION
(a)
A hall has a volume of 1,20,000 m3, it has reverberation time of 1.5 sec. what is average absorbing power of the surface if the total absorbing surface area is 25,000 m2.
3 Marks
(b)
Explain working of SONAR.
4 Marks
(c)
Explain construction and working of Ruby laser with necessary diagrams.
7 Marks
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About this Examination Paper & Attribution
Official Gujarat Technological University (GTU) examination paper and step-by-step solutions for Physics (Summer 2023, B.E. · Common Engineering, Sem 1). Features complete 70-mark regular & remedial examination pattern, official marking distribution across all 5 questions, and direct 1-click official PDF download.
Transcribed for student exam preparation from Gujarat Technological University official examination archives. Questions, syllabus guidelines, and curriculum marking schemes remain the intellectual property of Gujarat Technological University.