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Gujarat Technological UniversitySummer 2025 Examination

GTU 3110018 Physics Summer 2025 Paper Solution & PDF

B.E. · Common Engineering · Semester 1 · Subject Code: 3110018
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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
Jump toQ1Q2Q3Q4Q5

Question 1

14 MarksMedium
(a)
State and discuss Wiedemann-Franz law.
3 Marks
(b)

What is called Energy Band Gap? Draw energy band diagram for (i) Conductors, (ii) Semiconductors and (iii) Insulators.

4 Marks
(c)

What is photovoltaic effect? With neat diagram discuss construction and working of solar cell.

7 Marks

Question 2

14 MarksMedium
(a)
Enlist the assumptions of classical free electron theory. (Any three)
3 Marks
(b)

State any four points of differences between N-type and P-type Semiconductors.

4 Marks
(c)
Discuss in detail Kronig – Penney Model.
7 Marks
OR OPTION
(c)
Define density of states and derive its expression.
7 Marks

Question 3

14 MarksMedium
(a)

Evaluate Fermi function (or occupation probability) for energy 2kBT above the Fermi energy.

3 Marks
(b)
Derive formula of diffusion current density for electron as well as hole.
4 Marks
(c)

Discuss forward bias and reverse bias for a PN junction diode and draw characteristics curve.

7 Marks
OR OPTION
(a)
Write short note on: Phonon.
3 Marks
(b)
Discuss Fermi golden rule for transition probability.
4 Marks
(c)
Derive formula of fermi energy level for N-type semiconductor.
7 Marks

Question 4

14 MarksMedium
(a)

State any three points of differences between spontaneous emission and stimulated emission.

3 Marks
(b)
Discuss direct and indirect band gap semiconductors.
4 Marks
(c)
Explain in detail experimental procedure for DLTS.
7 Marks
OR OPTION
(a)
iWhat is called exciton?
iiName two metal-semiconductor junctions.
iiiWhat is called optoelectronic device?
3 Marks
(b)

The electrical conductivity (σ) of copper at 300 K is 6.2 × 107 Ω–1 m–1. Calculate the thermal conductivity of copper. Lorentz number is 2.44 × 10– 8 W/K2.

4 Marks
(c)

Discuss in detail UV-VIS method for band gap measurement of semiconductor.

7 Marks

Question 5

14 MarksMedium
(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)
iCalculate the critical current for a superconducting wire having radius of
02 mm at 5 K. Critical temperature of material of wire is 7.2 K and Hc
0is 2.2 × 104 A/m.
iiFor a superconducting material isotopic mass is 195 amu and critical temperature is 5.2 K. Calculate isotopic mass at 6.5 K.
7 Marks
OR OPTION
(a)
Write a short note on: SQUID
3 Marks
(b)
What is superconductivity? Discuss any three properties of superconductor.
4 Marks
(c)
Discuss in detail four-point probe method for the measurement of resistivity.
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 2025, 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.

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