Solved question paper for SCP May-2025 (B-TECH 1st-2nd)
Solved Question Paper
Semi-Conductor and Physics May-2025
PTU • B-TECH • Mechanical Engineering • 1st-2nd • May-2025
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.
These Questions are downloaded from www.brpaper.com. You can also download previous years question papers of 10th and 12th (PSEB & CBSE), B-Tech, Diploma, BBA, BCA, MBA, MCA, M-Tech, PGDCA, B-Com, BSc-IT, MSC-IT.
Solved Questions
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Write briefly:
a. Define Bloch' s theorem.Very Short Answer 2 Marks May-2025 • PTU B-TECHExisting answers are stored as HTML; you can edit directly without converting to Markdown.
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b. Distinguish between direct and indirect bandgaps.Very Short Answer 2 Marks May-2025 • PTU B-TECHExisting answers are stored as HTML; you can edit directly without converting to Markdown.
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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 May-2025 • PTU B-TECHExisting answers are stored as HTML; you can edit directly without converting to Markdown.
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Dec 2024 (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?
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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?
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d. What are Ohmic junctions?Very Short Answer 2 Marks May-2025 • PTU B-TECHExisting answers are stored as HTML; you can edit directly without converting to Markdown.
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e. Classify metals in Conductor, semiconductor and insulator on the basis of energy band.Very Short Answer 2 Marks May-2025 • PTU B-TECHExisting answers are stored as HTML; you can edit directly without converting to Markdown.
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f. Define population inversion.Very Short Answer 2 Marks May-2025 • PTU B-TECHExisting answers are stored as HTML; you can edit directly without converting to Markdown.
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May 2023 Write briefly: i) What do you mean by population inversion?
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g. What is Fermi's golden rule?Very Short Answer 2 Marks May-2025 • PTU B-TECHExisting answers are stored as HTML; you can edit directly without converting to Markdown.
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h. Explain Photovoltatic effect.Very Short Answer 2 Marks May-2025 • PTU B-TECHExisting answers are stored as HTML; you can edit directly without converting to Markdown.
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May 2024 Explain Photovolatic effect.
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i. When a laser has 3 V applied to it, it draws 30 mA and produce 3 mW of optical power. What is the efficiency of laser?Very Short Answer 2 Marks May-2025 • PTU B-TECHExisting answers are stored as HTML; you can edit directly without converting to Markdown.
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j. What are the necessary conditions for applying Van der Pauw method?Very Short Answer 2 Marks May-2025 • PTU B-TECHExisting answers are stored as HTML; you can edit directly without converting to Markdown.
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Dec 2024 What are the necessary conditions for applying Van der Pauw method?
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Dec 2024 What are the necessary conditions for applying Van der Pauw method?
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What are the special features of Classical free electron theory of metals? Derive an expression for the thermal conductivity of a metal.Long Answer 8 Marks May-2025 • PTU B-TECH
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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.
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Dec 2024 What are the special features of Classical free electron theory of metals? Derive an expression for the electrical conductivity of a metal.
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Dec 2024 What are the special features of Classical free electron theory of metals? Derive an expression for the electrical conductivity of a metal.
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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 May-2025 • PTU B-TECH
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May 2024 State Bloch\'s theorem for particles in a periodic potential. Explain the origin of energy bands using Kronig-Penny model.
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Dec 2024 What is Kronig-Penny model? Solve Schrödinger wave equation for periodic potential and explain the origin of energy bands in solids.
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Dec 2024 What is Kronig-Penny model? Solve Schridinger wave equation for periodic potential and explain the origin of energy bands in solids,
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Obtain the expression for electron density in an intrinsic semiconductor. Estimate the fraction of electrons in conduction band at room temperature in Ge with band gap 0.50 eV.Long Answer 8 Marks May-2025 • PTU B-TECH
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What is the need of extrinsic semiconductors? Discuss the effect of temperature on the Fermi level in extrinsic semiconductors.Long Answer 8 Marks May-2025 • PTU B-TECH
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Dec 2024 What is the need of extrinsic semiconductors? Discuss the effect of temperature on the Fermi level in extrinsic semiconductors.
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Dec 2024 What is the need of extrinsic semiconductors? Discuss the effect of temperature on the Fermi level in extrinsic semiconductors.
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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?
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What is joint density of states? Derive the expression for joint density of states.Long Answer 8 Marks May-2025 • PTU B-TECH
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Dec 2024 What is Fermi\\\'s golden rule? Derive the expression for joint density of states.
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Dec 2024 What is Fermi\'s golden rule? Derive the expression for joint density of states.
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What are Einstein coefficients? Obtain the relation between Einstein coefficients and discuss its importance.Long Answer 8 Marks May-2025 • PTU B-TECH
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May 2023 Discuss Einstein\\\'s coefficient. Derive relation between them.
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Explain any method to measure the wavelength of monochromatic light. Can the same method be used for measuring wavelength of white light?Long Answer 8 Marks May-2025 • PTU B-TECH
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(a) What is Four-point probe method? Explain the measurement of band gap using it.Long Answer 8 Marks May-2025 • PTU B-TECH
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(b) The resistivity of an intrinsic semiconductor is 5.5 Ω m at 30°C and 3.0 Ω m at 42°C. Find the band gap.Long Answer 8 Marks May-2025 • PTU B-TECH
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FAQ
Frequently Asked Questions
Answers about this subject, solved papers, and preparation.
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.