Question 1
(a)
What is full form of LASER? Write any four properties of laser light.
3 Marks
(b)
Draw Stress versus Strain diagram with necessary notation and discuss it.
4 Marks
(c)
Write detailed note on He-Ne laser with proper diagram.
7 Marks
Gujarat Technological UniversitySummer 2026 Examination
GTU 3110011 Physics Summer 2026 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)
Write any three properties of ultrasonic waves.
3 Marks
(b)
Write short note on I-shape girders.
4 Marks
(c)
State principle of Piezoelectric Generator. Describe construction and working of Piezoelectric generator.
7 Marks
OR OPTION
(c)
State principle of Magnetostriction Generator. Describe construction and working of Magnetostriction generator.
7 Marks
Question 3
(a)
What is reverberation and reverberation time? Write Sabin’s formula for reverberation time and explain each term.
3 Marks
(b)
State any four points of differences between spontaneous emission and stimulated emission.
4 Marks
(c)
Derive the expression for depression of Cantilever loaded at free end.
7 Marks
OR OPTION
(a)
Write and discuss any three factors affecting acoustic of building and their remedies.
3 Marks
(b)
Write any four points of differences between Destructive test and Non-destructive test.
4 Marks
(c)
Deduce the expression for the moment of couple required to twist the lower end of a solid wire of circular cross section by an angle θ, the upper end being clamped.
7 Marks
Question 4
(a)
Write short note on London Penetration Depth.
3 Marks
(b)
What is superconductivity? Discuss any three properties of superconductor.
4 Marks
(c)
iWrite a short note on SQUID.
iiExplain in detail BCS theory of superconductivity.
7 Marks
OR OPTION
(a)
Discuss various applications of Laser in Science and Engineering.
3 Marks
(b)
The volume of a room is 1500 m3. The wall area of the room is 240 m2, the floor area is 125 m2, and the ceiling area is 125 m2. The average sound absorption coefficient (i) for wall is 0.025; (ii) for the ceiling is 0.85; and (iii) the floor is 0.09. Calculate the average sound absorption coefficient and reverberation time.
4 Marks
(c)
Write detailed note on Ruby laser with proper diagram.
7 Marks
Question 5
(a)
What is Meissner effect? For superconductor show that χm = –1.
3 Marks
(b)
Write any four points of comparison of type-I and type-II superconductor.
4 Marks
(c)
With the help of Einstein’s theory of radiation establish the relation between Einstein’s coefficients.
7 Marks
OR OPTION
(a)
The critical current passing through a superconducting wire of radius 10 mm is 15 A. Calculate critical magnetic field.
3 Marks
(b)
Calculate the length of iron rod which can be used to produce ultrasonic waves of 20 kHz. Given that the density of iron is 7230 kg/m3 and its Young’s modulus is 11.6 × 109 N/m2.
4 Marks
(c)
Write short note on
iAmplitude Resonance
iiVelocity Resonance
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 2026, 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.