📄 Question Paper Overview
The examination is for the 2024-25 academic session, with a total duration of 3 hours and a Maximum Marks (M.Marks) of 70.
Subject: Engineering Physics
Subject Code: BAS101
Level: B.Tech (SEM I) Theory Examination
Time: 3 HRS
Max Marks: 70
Identification Code: QP25DP2_290
Date/Time of Print: 18-Mar-2025 9:01:42 AM
📝 Structure and Content
The paper is divided into three sections (A, B, and C), with instructions to attempt all sections.
Section A: Short Answer Questions (Total Marks: 14)
Consists of seven compulsory questions (Q. No. 1, parts a-g), each carrying 2 marks.
Questions require brief answers and cover fundamental concepts (K1 and K2 levels) from various units of the syllabus.
Topics include: Planck's assumptions for black body radiation, wave packet in Quantum Mechanics, skin depth, Newton's rings (dark center), spontaneous vs. stimulated emission, formulae for cut-off parameter and number of modes in a fiber, and Quantum Well/Wire.
Section B: Medium Answer Questions (Total Marks: 21)
Requires attempting any three out of five given questions (Q. No. 2, parts a-e).
Each question carries 7 marks.
These questions primarily involve derivations and explanations (K3 and K2 levels).
Topics include:
Schrödinger's time-independent wave equation and physical interpretation of the wave function.
Derivation of the electromagnetic wave equation in free space and proof of wave speed.
Interference in thin films (reflected light) and conditions for bright/dark rings.
Explanation of radiation processes (absorption, spontaneous, stimulated emission) and derivation of the $\frac{A_{21}}{B_{21}}$ ratio.
Explanation of Type I and II superconductors and a numerical problem on critical fields and transition temperature.
Section C: Long Answer/Numerical Questions (Total Marks: 35)
Consists of five main questions (Q. No. 3 to Q. No. 7).
In each of the five questions, candidates must attempt any one part (a or b), with each part carrying 7 marks.
The questions are analytical, descriptive, or numerical (K2 and K3 levels).
Key areas covered:
Q. 3 (Quantum Physics): Davisson and Germer experiment OR probability calculation for a particle in a 1D potential box.
Q. 4 (Electromagnetism): Derivation of the work-energy theorem for an EM field OR a numerical problem on calculating $\vec{E}$ and $\vec{B}$ fields from a lamp's radiation.
Q. 5 (Optics): Fraunhofer diffraction at a single slit (including intensity ratio) OR a numerical problem on thin film interference (calculating minimum thickness).
Q. 6 (Laser & Fiber Optics): Explanation and derivation for acceptance angle, cone, and Numerical Aperture of an optical fiber OR construction and working of a He-Ne laser.
Q. 7 (Modern Materials): Discussion of the Meissner effect (perfect diamagnetism and zero resistivity) OR explanation of the top-down approach and the CVD method for nanomaterial fabrication.
