What this set is
This is an original Doubtly set of 24 most important questions for the Mumbai University FE Semester 1 Applied Physics (BSC102, NEP 2020 scheme) exam in Winter 2026. It is not an official university paper and does not predict the actual paper. Questions are grouped module by module, and every question has a full step-by-step solution written by Doubtly. Marks (3 or 5) follow the way such questions are marked in recent MU papers.
How the questions were chosen
We went through the last three Applied Physics papers (December 2024, June 2025 KT and December 2025) and listed the question type behind every sub-question. Types that came in two or three of these papers were picked. Some questions are taken as-is from those papers, and their stems say which paper they came from; the rest are new questions of the same type with new numbers.
| Module and question type | Dec 2024 | June 2025 KT | Dec 2025 |
|---|---|---|---|
| Lasers: He–Ne laser construction and working | Yes | Yes | Yes |
| Lasers: metastable state / optical resonator | Yes | Yes | Yes |
| Fibre optics: numerical aperture / acceptance angle derivation | Yes | Yes | Yes |
| Fibre optics: NA, critical angle, cladding index numericals | Yes | Yes | Yes |
| Thin films: conditions for maxima and minima in reflected light | No | Yes | Yes |
| Thin films: antireflection coating / film thickness | No | Yes | Yes |
| Thin films: Newton's rings numerical | Yes | Yes | No |
| Electrodynamics: divergence of curl, curl numericals | Yes | Yes | Yes |
| Electrodynamics: Maxwell's equation derivations | Yes | Yes | Yes |
| Quantum: properties of matter waves / de Broglie hypothesis | Yes | Yes | Yes |
| Quantum: de Broglie wavelength, momentum and energy numericals | Yes | Yes | Yes |
| Quantum: Schrödinger equation derivation | No | Yes | Yes |
| Quantum: particle in an infinite well numerical | Yes | No | Yes |
| Semiconductors: Fermi level lies midway in an intrinsic semiconductor | Yes | Yes | Yes |
| Semiconductors: Fermi–Dirac distribution function | Yes | Yes | No |
| Semiconductors: conductivity, carrier concentration, mobility numericals | Yes | Yes | Yes |
The He–Ne laser, the numerical aperture (or acceptance angle) derivation and the Fermi level of an intrinsic semiconductor came in all three papers, almost word for word, and "divergence of curl is zero" came in two; these are included as-is (Q.3, Q.6, Q.22 and Q.13). Gradient of a scalar field, why an electron cannot exist in the nucleus, the uncertainty principle numerical and laser applications such as LIDAR each came once, so revise them from your notes as well.
How to use this set
Try each question on paper first, under time: about 2 minutes per mark, the pace of the real 45-mark, 90-minute exam. Then compare your working with the solution. For derivations, practise drawing the figure and writing the numbered steps; for numericals, write the formula, the substitution with units and the final answer, as the solutions do. Every numerical answer here was checked with Python.
FAQs
Are these the questions that will come in the Winter 2026 exam?
No one can promise that. These are the question types that repeated most across the last three papers, so they are the best use of revision time, but study the full syllabus too.
Why are some questions marked "asked in MU"?
Those questions were set by the university in the paper named, so you can see the exact exam wording. All other questions are new ones of the same type, and all solutions are Doubtly's own.
What is the actual exam pattern?
The recent papers are 45 marks in 1 hour 30 minutes. Q.1 has seven 3-mark questions (attempt any five, 15 marks). Q.2 to Q.5 each have three 5-mark parts, and you attempt any two of these four questions (30 marks).