Section A
UPSC IFS 2023 Physics Paper I Question Paper PDF
- Year 2023
- Conducted By UPSC
- Questions 8
- Maximum Marks 200
- Duration Three Hours
- Languages English
Exam Details
| Detail | Information |
|---|---|
| Examination | Indian Forest Service (Main) Examination |
| Year | 2023 |
| Conducting Body | UPSC |
| Paper | Physics Paper - I |
| Subject | Physics |
| Duration | Three Hours |
| Maximum Marks | 200 |
| Number of Questions | 8 |
| Question Type | Descriptive / Subjective |
This is the Physics Paper I from the Indian Forest Service (Main) Examination conducted by UPSC in 2023. The paper consists of 8 questions, of which 5 are to be attempted. Questions 1 and 5 are compulsory, and candidates must select at least one question from each of the two sections (A and B) from the remaining six questions. This paper is crucial for candidates aspiring to join the Indian Forest Service, providing a clear understanding of the exam's scope and difficulty level in Physics.
Major Topics Covered
- Physics
- Physical Constants
- Indian Forest Service (Main) Examination
- Physics Paper - I
- UPSC
- 2023 question paper
- previous year paper
- PDF download
Why This Paper is Important
- Useful for Indian Forest Service (Main) Examination preparation
- Helps understand the latest exam pattern
- Useful for practice and self-assessment
- Covers frequently asked General Studies topics
- Helpful for analysing question trends
Related Resources
- Indian Forest Service (Main) Examination 2023 Physics Paper II
- Indian Forest Service (Main) Examination 2022 Physics Paper I
- Civil Services Examination 2023 Physics Optional Paper
- Indian Forest Service (Main) Examination 2023 Physics Paper I Answer Key
- UPSC IFS 2023 Physics Paper I Solutions
- Indian Forest Service Physics Syllabus
- UPSC Main Examination Physics Syllabus
- Indian Forest Service Main Examination Pattern
Instructions
- There are EIGHT questions in all, out of which FIVE are to be attempted.
- Out of the remaining SIX questions, THREE are to be attempted selecting at least ONE question from each of the two Sections A and B.
- Attempts of questions shall be counted in sequential order.
- Unless struck off, attempt of a question shall be counted even if attempted partly.
- Any page or portion of the page left blank in the Question-cum-Answer Booklet must be clearly struck off.
- The number of marks carried by a question/part is indicated against it.
- Unless otherwise mentioned, symbols and notations have their usual standard meanings.
- Assume suitable data, if necessary and indicate the same clearly.
- Neat sketches may be drawn, wherever required.
- Answers must be written in ENGLISH only.
- Useful Constants: = 1.602 \times 10^{-19} C Electron charge (e) = 9.109 \times 10^{-31} kg Electron rest mass (m_e) = 1.672 \times 10^{-27} kg Proton mass (m_n) = 8.854 \times 10^{-12} farad/m Vacuum permittivity (\epsilon_0) = 4\pi \times 10^{-7} T m/A Vacuum permeability (\mu_0) Velocity of light in free space (c) = 3 \times 10^8 m/s = 1.380 \times 10^{-23} \text{ J/K} Boltzmann constant (k) = 1.602 \times 10^{-19} J Electronvolt (eV) = 6.626 \times 10^{-34}J s Planck constant (h) = 5.67 \times 10^{-8} W m-2 K-4 Stefan constant (σ) = 6.022 \times 10^{26} kmol-1 Avogadro number (N) 8.31\times10^{3} J kmol-1 K-1 Gas constant (R) 2.718 exp(1)
Questions (page 2)
Section A
Q2. A hoop is rolling down on an inclined plane without slipping. Find its velocity at the bottom of the inclined plane. Calculate the inertia tensor for a rigid body consisting of three particles of masses 3 gm, 1 gm, 2 gm located at (1, -1, 2) cm, (1, 0, 2) cm, (-2, 1, 0) cm respectively. Define Einstein's coefficients A and B for spontaneous and stimulated emissions, and write the relation between them. If the Einstein's coefficient of spontaneous emission is 107/s, determine the Einstein's coefficients for the stimulated emission for the emission wavelength of 5800 Å.
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Frequently asked questions
What is the name of the exam?
The exam is the Indian Forest Service (Main) Examination.
Which year is this question paper from?
This question paper is from the year 2023.
Who conducts the Indian Forest Service Examination?
The Indian Forest Service Examination is conducted by UPSC (Union Public Service Commission).
What is the subject of this paper?
This paper is Physics Paper - I.
What is the paper code?
The paper code is BJKE-U-PHY/46.
How many questions are there in total?
There are 8 questions in total.