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Gujarat Technological UniversitySummer 2024 Examination

GTU 3110018 Physics Summer 2024 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)

Define following terms.

iCritical Temperature
iiPersistent Current
iiiIsotope effect
3 Marks
(b)
Explain hot point probe method with necessary diagrams.
4 Marks
(c)

Explain in detail how Kronig and Penney model explains the origin of band gap in semiconductors.

7 Marks

Question 2

14 MarksMedium
(a)
Compare n-Type and p-Type Semiconductors.
3 Marks
(b)
Distinguish between Type-I and Type-II Superconductivity.
4 Marks
(c)

Determine the necessary formula for density of hole in Valence Band for Intrinsic Semiconductors.

7 Marks
OR OPTION
(c)

What are Einstein’s coefficients? Give relation between them and discuss the result.

7 Marks

Question 3

14 MarksMedium
(a)
Define:
iEnergy Gap
iiFermi Function
iiiDensity of states
3 Marks
(b)

Estimate the position of Fermi Level at 300 K for a material with EC =

08 eV and EV = 0.5 eV (me* = 0.14m0 and mh* = 0.28m0 , m0 is rest mass of an electron).
4 Marks
(c)
Illustrate Four probe method for thin sheet and bulk sample in detail.
7 Marks
OR OPTION
(a)
What are the postulates for free electron theory?
3 Marks
(b)

In an intrinsic semiconductor, energy gap is 1.3 eV. Evaluate the ratio between its conductivity at temperature 700 K and 400 K.

4 Marks
(c)

Show that Junction capacitance is inversely proportional to square root of Reverse biasing Voltage.

7 Marks

Question 4

14 MarksMedium
(a)

What do you mean by Photo Voltaic Effect? Write its three applications in the field of engineering.

3 Marks
(b)

Using Fermi function, evaluate the temperature at which there is 20 % probability that an electron in solid will have energy 0.3 eV above EF of 3 eV.

4 Marks
(c)

Explain at least seven properties of Superconductors in detail with necessary diagram and equations.

7 Marks
OR OPTION
(a)
Define :
iPopulation Inversion
iiMeta stable state
iiiActive Medium
3 Marks
(b)

Explain how the materials are classified into conductors, semiconductors and insulators with the help of energy band diagrams.

4 Marks
(c)

Briefly outline the mechanism of superconductivity using BCS theory and explain penetration depth.

7 Marks

Question 5

14 MarksMedium
(a)

Compare Direct Band Gap semiconductors and Indirect Band Gap semiconductors

3 Marks
(b)
What are Excitons? explain the types of Exciton.
4 Marks
(c)
iEstimate the concentration of holes and electrons in n-type silicon at 300 K. If the conductivity is 8 X 104 Ʊ/m. also find these value for p- type Si. ni = 2.5 X 1016 m-3 ,electron and hole mobility is 1600X10-4 m2/V.Sec and 700X10-4 m2/V.Sec respectively.
iiEvaluate the Electron and Hole concentration at room temperature, for a intrinsic semiconductor, if its conductivity at room temperature is 8×10- 4 Ʊ/m. The mobility of Electron and Hole are 0.24 m2/V.Sec and 0.08 m2/V.Sec respectively.
7 Marks
OR OPTION
(a)
List difference between drift and diffusion current
3 Marks
(b)
Explain in detail the Fermi’s Golden Rule.
4 Marks
(c)
iIn a solid consider an energy level lying 0.2 eV above Fermi level. Estimate the probability of this level not being occupied by an electron at room temperature.
iiA rectangular semiconductor specimen of thickness 1 mm is placed in the magnetic field of flux density 0.5 Wb/m2. Current of 1.5 mA is flowing through the specimen in one direction. Evaluate Hall coefficient of the material if generated hall voltage is 7.5 mV.
3 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 2024, 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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