Gujarat Technological UniversitySummer 2026 examination

GTU 3110018 Physics Summer 2026 Question Paper & PDF

B.E. · Common Engineering · Semesters 1 and 2 · Subject code 3110018
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Total
70 marks
To pass
23 marks (33%)
Duration
2.5 Hours 10:30 AM – 1:00 PM
Questions
5 with internal choice
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13 of 25 questions on this paper were also asked in other years. 6 more are types of question GTU sets again with new data. Each is marked below with the years it appeared.See all 40 repeated 3110018 questions, most asked first

Q.1

14 Marks
(a)
3 marksAsked in 6 of 7 papers
State the assumptions of classical free electron theory.

Also asked in Summer 2025 Q2a, Winter 2024 Q5a OR, Summer 2024 Q3a OR, Winter 2023 Q1a, Summer 2023 Q2a

(b)
4 marksSame type asked in 2 of 7 papers

For a given intrinsic semiconductor with energy gap Eg = 0.44 eV, calculate the position of Fermi Level at 300 K. (Where m = me* = m0 which is rest mass of an Electron).

Also asked in Summer 2024 Q3b

(c)
7 marksAsked in 5 of 7 papers
What is superconductivity? Explain any six properties of superconductor.

Also asked in Winter 2025 Q5c OR, Summer 2025 Q5b OR, Summer 2024 Q4c, Winter 2023 Q1c

Q.2

14 Marks
(a)
3 marks

Explain the light material interaction in terms of absorption, spontaneous emission and stimulated emission in semiconductors with proper diagrams.

(b)
4 marksSame type asked in 2 of 7 papers

Calculate

ithe value of band gap for a LED for the emission of blue light of wavelength 452 nm.
iithe value of wavelength for LED having band gap 2.0 eV. (h = 6.63x10‒34 Js, c = 3x10⁸ m/s)

Also asked in Winter 2025 Q3a

(c)
7 marksAsked in 4 of 7 papers

Define resistivity and explain four point probe method with diagram for the measurement of resistivity of bulk sample.

Also asked in Summer 2025 Q5c OR, Winter 2024 Q4c OR, Summer 2023 Q5c

(c)
7 marksAsked in 3 of 7 papers

What is deep level in band theory? Describe the experimental procedure for DLTS method to study deep levels.

Also asked in Summer 2025 Q4c, Winter 2023 Q5c

Q.3

14 Marks
(a)
3 marksAsked in 2 of 7 papers
Define :(i) Forbidden Gap (ii)Fermi Function, (iii) Density of states

Also asked in Summer 2024 Q3a

(b)
4 marks

A sample of pure Si at room temperature has a carrier concentration of 1.5x 10¹⁶ /m³. A donor impurity is added at ration 1/10⁸ to the silicon atoms. If the Si has atomic density 5x10²⁸ atoms/ m³, determined the resistivity of the sample. ( Given μe = 0.135 m²/V.s and μh = 0.048 m²/

Vs)
(c)
7 marksAsked in 2 of 7 papers

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

Also asked in Winter 2023 Q2c OR

(a)
3 marks
Write a short note on P-N junction diode
(b)
4 marksSame type asked in 2 of 7 papers

At what temperature, we can expect a 10% probability that electrons in metal have an energy, which is 1% above the Fermi energy? Fermi energy if the metal is 5.67 eV.

Also asked in Summer 2024 Q4b

(c)
7 marksAsked in 6 of 7 papers

Explain the Kronig-Penny model of solids and show that how it explains the origin of band gap in solids.

Also asked in Winter 2025 Q1c, Summer 2025 Q2c, Winter 2024 Q1c, Summer 2024 Q1c, Summer 2023 Q3c OR

Q.4

14 Marks
(a)
3 marksAsked in 5 of 7 papers

Describe the hot probe method to identify the type of semiconductor (for 03 N-type semiconductor)

Also asked in Winter 2025 Q4a OR, Winter 2024 Q4b OR, Summer 2024 Q1b, Summer 2023 Q4b OR

(b)
4 marksSame type asked in 3 of 7 papers

Calculate the critical current for wire of metal alloy having diameter 1mm at 4.5 K. (Given Critical temperature for alloy is 9.0 K and Hc(0) = 6.5x 10⁴ Am-1)

Also asked in Winter 2023 Q5a, Summer 2023 Q5b OR

(c)
7 marksAsked in 5 of 7 papers

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

Also asked in Winter 2025 Q3b, Summer 2025 Q1c, Winter 2023 Q4c, Summer 2023 Q3c

(a)
3 marks
Write the assumptions of four probe method.
(b)
4 marksSame type asked in 3 of 7 papers

In the Hall probe measurement, current of 300 mA is sent through a sample having length 10mm, width 5mm and height 0.2mm. The Hall voltage observed to be 150μV, when sample was exposed with 2000 gauss field perpendicularly. Calculate carrier concentration and drift velocity of the carrier in the sample.

Also asked in Winter 2025 Q4a, Winter 2023 Q4a OR

(c)
7 marksAsked in 2 of 7 papers

What is light gain? Explain the Einstein’s theory about interaction between matter and radiation in detail along with absorption and emission with necessary equation.

Also asked in Winter 2025 Q3c OR

Q.5

14 Marks
(a)
3 marksAsked in 2 of 7 papers

State any three points of differences between intrinsic and extrinsic semiconductors.

Also asked in Summer 2023 Q3b

(b)
4 marksSame type asked in 2 of 7 papers

For a metal sample, Density = 16.6x10³ kgm⁻³, Resistivity= 50 μΩ.cm and Atomic weight = 180.95, then calculate the mobility and the average collision time for metal through classical theory.

Also asked in Winter 2024 Q5b

(c)
7 marksAsked in 4 of 7 papers

Explain Meissener’s effect in detail and show that for superconductor, χm = –1

Also asked in Summer 2025 Q5a, Winter 2024 Q5b OR, Summer 2023 Q4c

(a)
3 marks

State any three points of differences between Ohmic junction and Schottky junction.

(b)
4 marks

Calculate

iSi wafer has been doped with donor atoms uniformly. The concentration of donor is 2.9 x10¹⁵ atoms/ cm³. Calculate the Fermi energy with respect to the pure silicon. (ni = 1.45 x10¹⁰ atoms/cm³)
iiElectron mobility in pure Si is 50 m²/ V.s at 4.5 K, what will be the mobility at 300K?
(c)
7 marksAsked in 2 of 7 papers

Discuss BCS theory of superconductivity in brief. (ii) Draw constructive diagram of SQUID and mention its application.

Also asked in Winter 2023 Q5c OR

More Physics papers

Questions repeat across sessions. Working through two or three papers shows you which topics GTU asks most.

Winter 202570 marks · 5 questions
Summer 202570 marks · 5 questions
Winter 202470 marks · 5 questions
Summer 202470 marks · 5 questions

Other Semester 1 subjects

BE Common

3110001
Chemistry
3110002
English
3110003
Programming for Problem Solving
3110004
Basic Civil Engineering

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About this paper

Official Gujarat Technological University (GTU) examination paper 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.

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