Solved question paper for SCP Dec-2024 (B-TECH 1st-2nd)

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Semi-Conductor and Physics Dec-2024

PTU • B-TECH • Civil Engineering • 1st-2nd • Dec-2024

Semi-Conductor and Physics previous year question papers on BRpaper are organized for students of Punjab Technical University’s Bachelor of Technology program, 1st-2nd semester. This section makes it easier to browse subject-wise old question papers for Semi-Conductor and Physics, so students can review how questions are typically framed in past exams and get a sense of the exam pattern. Many students search for semi-conductor and physics previous year question paper while preparing for exams, and this page is built to support exactly that kind of subject-wise browsing and revision. BRpaper is not the official website of Punjab Technical University or any institution, and it does not publish official notices or academic updates.

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(a) Why are electrons in metals often considered to have free-electron behavior?

Very Short Answer 2 Marks Dec-2024 • PTU B-TECH

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Dec 2024 Why are electrons in metals often considered to have free-electron behavior?

Dec 2023 What is meant by the free-electrons gas model of metals?

May 2019 What do you understand by free electron gas model of metals?
(b) Out of direct and indirect band gap materials, which is used to fabricate LED and why?

Very Short Answer 2 Marks Dec-2024 • PTU B-TECH

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Dec 2024 Out of direct and indirect band gap materials, which is used to fabricate LED and why?
(d) How does doping affect the electrical properties of an intrinsic semiconductor?

Very Short Answer 2 Marks Dec-2024 • PTU B-TECH

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Dec 2024 How does doping affect the electrical properties of an intrinsic semiconductor?
(c) In a solid, consider the energy level lying 0.01 eV above Fermi level. What is the probability of this level being occupied by an electron at 200 K?

Very Short Answer 2 Marks Dec-2024 • PTU B-TECH

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May 2025 Write briefly:\r\nc. In a solid, consider the energy level lying 0.01 eV above Fermi level. What is the probability of this level being occupied by an electron at 200 K?

Dec 2024 In a solid, consider the energy level lying 0.01 eV above Fermi level. What is the probability of this level being occupied by an electron at 200 K?

(e) Describe the depletion region in a p-n junction.

Very Short Answer 2 Marks Dec-2024 • PTU B-TECH

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Dec 2024 Describe the depletion region in a p-n junction.
(f) Explain the term "population inversion" and its importance in lasers.

Very Short Answer 2 Marks Dec-2024 • PTU B-TECH

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(g) What is optical loss, and how does it impact the performance of optoelectronic devices?

Very Short Answer 2 Marks Dec-2024 • PTU B-TECH

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(h) What is the difference between spontaneous and stimulated emission in semiconductors?

Very Short Answer 2 Marks Dec-2024 • PTU B-TECH

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Dec 2024 What is the difference between spontaneous and stimulated emission In semiconductors? exams paper 7

May 2020 What are the differences between stimulated and spontaneous emission?

What are the necessary conditions for applying Van der Pauw method?

Very Short Answer 2 Marks Dec-2024 • PTU B-TECH

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May 2025 Write briefly:\r\nj. What are the necessary conditions for applying Van der Pauw method?

Dec 2024 What are the necessary conditions for applying Van der Pauw method?
Can we determine the type of extrinsic semiconductor (n-type or p-type), using hot-point probe?

Very Short Answer 2 Marks Dec-2024 • PTU B-TECH

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Dec 2024 Can we determine the lype of extrinsic semiconductor (n-type or p-type), using hot- point probe?
What are the special features of Classical free electron theory of metals? Derive an expression for the electrical conductivity of a metal.

Long Answer 8 Marks Dec-2024 • PTU B-TECH

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May 2025 What are the special features of Classical free electron theory of metals? Derive an expression for the thermal conductivity of a metal.

May 2024 Discuss the failure of Classical free electron theory. What are the special features of quantum free electron theory of metals? Derive an expression for the electrical conductivity of a metal.

Dec 2024 What are the special features of Classical free electron theory of metals? Derive an expression for the electrical conductivity of a metal.
What is Kronig-Penny model? Solve Schrödinger wave equation for periodic potential and explain the origin of energy bands in solids.

Long Answer 8 Marks Dec-2024 • PTU B-TECH

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May 2025 What is Kronig-Penny model? Solve Schrödinger wave equation for periodic potential and explain the origin of energy bands in solids.

May 2024 State Bloch\'s theorem for particles in a periodic potential. Explain the origin of energy bands using Kronig-Penny model.

Dec 2024 What is Kronig-Penny model? Solve Schridinger wave equation for periodic potential and explain the origin of energy bands in solids,

Obtain the expression for electron density in n-type extrinsic semiconductor.

Long Answer 8 Marks Dec-2024 • PTU B-TECH

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Dec 2024 Obtain the expression for electron density in n-type extrinsic semiconductor,
What is the need of extrinsic semiconductors? Discuss the effect of temperature on the Fermi level in extrinsic semiconductors.

Long Answer 8 Marks Dec-2024 • PTU B-TECH

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May 2025 What is the need of extrinsic semiconductors? Discuss the effect of temperature on the Fermi level in extrinsic semiconductors.

Dec 2024 What is the need of extrinsic semiconductors? Discuss the effect of temperature on the Fermi level in extrinsic semiconductors.

Dec 2023 Derive an expression for Fermi energy in an intrinsic semiconductor. What is the effect of temperature on Fermi level in an intrinsic semiconductor?
What is Fermi's golden rule? Derive the expression for joint density of states.

Long Answer 8 Marks Dec-2024 • PTU B-TECH

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May 2025 What is joint density of states? Derive the expression for joint density of states.

Dec 2024 What is Fermi\'s golden rule? Derive the expression for joint density of states.
Define the Einstein coefficients for spontaneous and stimulated emission and absorption. Derive the relationships among these coefficients and explain their importance.

Long Answer 8 Marks Dec-2024 • PTU B-TECH

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Dec 2024 Define the Einstein coefficients for Spontaneous and stimulated emission and absorption. Derive the relationships among these coefficients and explain their importance.

Define beam spot and divergence for laser beam. Explain the procedure to measure the divergence of laser beam.

Long Answer 8 Marks Dec-2024 • PTU B-TECH

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Dec 2024 Define beam spot-and divergence for laser beam. Explain the procedure to measure the divergence of laser beam.
What is Four-point probe method? How four probe is better than two probe method? Explain the measurement of resistivity using it.

Long Answer 8 Marks Dec-2024 • PTU B-TECH

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Dec 2024 What is Four-point probe method? How four probe is better than two probe method? Explain the measurement of resistivity using it. NOTE : Disclosure of Identity by writing Mobile No. or Making of passing request on any page of Answer Sheet will lead to UMC against the Student.

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01 Where can I find Semi-Conductor and Physics previous year question papers for Bachelor of Technology, 1st-2nd semester?

This page lists Semi-Conductor and Physics question papers uploaded for Punjab Technical University Bachelor of Technology, 1st-2nd semester, organized for subject-wise browsing where available.

02 Are these official Punjab Technical University question papers?

BRpaper is not the official website of Punjab Technical University. These papers are shared for reference and revision purposes only and are not official university material.

03 How can previous year Semi-Conductor and Physics papers help in exam preparation?

Reviewing past papers can help you understand how questions are typically framed, notice commonly repeated topics, and get a sense of the exam pattern before your own exam.

04 What kind of topics does Semi-Conductor and Physics usually cover?

The question papers here relate to the official Semi-Conductor and Physics syllabus set by the university for this course and semester.

05 Does this page include a Semi-Conductor and Physics previous year question paper or solved answers?

This page focuses on providing access to the previous year question papers themselves. A separate question bank or solved answers may not be available for every paper.

06 Can I find papers for other subjects in the same Bachelor of Technology?

Yes, BRpaper organizes papers by university, course, stream, and semester, so you can browse other subjects within the same Punjab Technical University Bachelor of Technology.

Solved question paper for SCP Dec-2024 (B-TECH 1st-2nd)

Semi-Conductor and Physics Dec-2024

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