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Gujarat Technological UniversityWinter 2023 Examination

GTU 3110018 Physics Winter 2023 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 Hours2:30 PM – 5:00 PM
Paper Structure5 QuestionsWith internal OR choices
Jump toQ1Q2Q3Q4Q5

Question 1

14 MarksMedium
(a)

Mention any three postulates of classical free electron theory proposed by Lorents and Drude.

3 Marks
(b)
iState any two points of differences between intrinsic and extrinsic semiconductors.
iiState any two points of differences between n-type and p-type semiconductors.
4 Marks
(c)

What is superconductivity? Discuss any three properties of superconductors in detail.

7 Marks

Question 2

14 MarksMedium
(a)

Obtain Fermi factor f (E) for energy 0.01 eV above Fermi energy (Ef) at 500 K.

3 Marks
(b)
State and discuss Wiedemann-Franz law.
4 Marks
(c)
Define density of states and derive its expression.
7 Marks
OR OPTION
(c)

What is E-k diagram? Discuss direct and indirect band gap semiconductors based on E-k diagram.

7 Marks

Question 3

14 MarksMedium
(a)
iWrite fermi distribution function and mention physical significance of it.
iiMention any two applications of solar cell.
3 Marks
(b)
Derive formula of drift and diffusion current densities.
4 Marks
(c)
iDraw characteristic curve for p-n junction diode.
iiDiscuss forward bias characteristics with proper circuit diagram.
iiiDiscuss reverse bias characteristics with proper circuit diagram.
7 Marks
OR OPTION
(a)

A potential barrier of 0.6 V exists across of p-n junction. The intensity of the electric field in this region is 2.4 106 V/m. Find the width of depletion region.

3 Marks
(b)
iMention any two applications of LED.
iiCalculate the value of band gap for a LED for the emission of blue light of wavelength 452 nm. (h = 6.63 10‒34 J s, c = 3 108 m/s)
4 Marks
(c)
Derive formula of fermi energy level for n-type semiconductor.
7 Marks

Question 4

14 MarksMedium
(a)
iWhat is called optoelectronic device?
iiName the types of metal-semiconductor junction.
iiiWhat is called exciton?
3 Marks
(b)
Discuss Frenkel and Wannier-Mott exciton in brief.
4 Marks
(c)

What is photovoltaic effect? Explain construction and working of solar cell in detail.

7 Marks
OR OPTION
(a)
iWhat is Hall effect?
iiThe Hall coefficient of a semiconducting material is 2.4 10‒4 m3/C. Calculate the mobility and carrier concentration of the carrier if resistivity is 6 10‒3 Ω m.
3 Marks
(b)
Discuss Fermi’s golden rule for transition probability.
4 Marks
(c)

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

7 Marks

Question 5

14 MarksMedium
(a)

Calculate the critical current through a long thin superconducting wire of radius 10–3 m. The critical magnetic field is 6.2 103 A/m.

3 Marks
(b)

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

4 Marks
(c)
Discuss in detail experimental procedure for DLTS.
7 Marks
OR OPTION
(a)

The critical temperature of a superconductor is 7.5 K. Calculate the critical field at 5 K. At 0 K the critical field is 0.24 T.

3 Marks
(b)
Write a short note on London penetration depth.
4 Marks
(c)
iDiscuss BCS theory of superconductivity in brief.
iiDraw constructive diagram of SQUID and mention its application.
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 (Winter 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.

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