IFS Exam 2016 Physics Paper I Question Paper PDF

Central Government Jobs Other Jobs 2016

  • Year 2016
  • Conducted By UPSC
  • Maximum Marks 200
  • Duration Three Hours
  • Languages English

Exam Details

Detail Information
Examination I.F.S. EXAM
Year 2016
Conducting Body UPSC
Paper PHYSICS Paper I
Subject Physics
Duration Three Hours
Maximum Marks 200
Question Type Descriptive / Subjective

This is the Physics Paper I question paper for the I.F.S. EXAM conducted in 2016 by UPSC. The exam allows three hours to complete and has a maximum of 200 marks. This paper is crucial for aspirants preparing for the Indian Forest Service examination, offering insights into the types of questions asked in Physics, particularly in Paper I. It covers a range of topics within Physics, aiding candidates in their study plan and revision.

Major Topics Covered

  • Force Field
  • Conservative Field
  • Scalar Potential
  • Electromagnetic Waves
  • Dispersive Medium
  • Group Velocity
  • Refractive Index
  • Michelson-Morley Experiment
  • Fringe Shift
  • Diffraction Grating
  • Dispersive Power
  • Stationary Wave
  • Superposition of Waves
  • Nodes
  • Cyclic Coordinates
  • Hamilton's Principle
  • Lagrange's Equations
  • Euler's Equations
  • Rigid Body Motion
  • Kinetic Energy
  • Velocity 4-vector
  • Inertial Frame
  • Einstein's Law of Addition of Velocities

Why This Paper is Important

  • Useful for I.F.S. EXAM 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

  • IFS Exam 2015 Physics Paper I
  • IFS Exam 2017 Physics Paper I
  • IFS Exam 2016 Physics Paper II
  • UPSC Physics Optional Papers
  • IFS Exam 2016 Physics Paper I Answer Key
  • IFS Physics Syllabus
  • UPSC Physics Optional Syllabus
  • IFS Exam 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.
  • Answers must be written in ENGLISH only.
  • 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.
  • Useful Constants 1.602\times10^{-19} C Electron charge (e) = 9.109\times10^{-31} kg Electron rest mass (m_e) = 1.672\times10^{-27} kg Proton mass (m_p) = 8.854\times10^{-12} farad/m Vacuum permittivity (\varepsilon_0) 1.257\times10^{-6} henry/m Vacuum permeability (\mu_0) \alpha and \alpha Velocity of light in free space (c) 3\times10^8 m/s \equiv 1.380\times10^{-23} J/K Boltzmann constant (k) = 1.602\times10^{-19} J Electron volt (eV) = 6.626 \times 10^{-34} J s Planck constant (h) = 5.67\times10^{-8} Wm-2 K-4 Stefan constant (\sigma) 6.022\times10^{26} kmol-1 Avogadro number (N) 8.31\times10^{3} J kmol-1 K-1 Gas constant (R) = 2-718 exp(1) = c-mns-u-pys

Questions (page 2)

Section A

Q1. Answer all of the following :

(a) A force field is given by \vecF = (2xy + z3)\hati + x2\hatj + 3xz2\hatk. Is it a conservative field? If so, what is the scalar potential?

(b) Prove that the group velocity Vg of electromagnetic waves in a dispersive medium is given by Vg = (c)/(n + ω \, dn / dω) where c is the velocity of light in vacuum and n is the refractive index of the medium for the angular frequency ω of the waves.

(c) What is the significance of the null result of Michelson-Morley experiment? In their experiment Michelson and Morley set l1 = l2 = 11 metres. The wavelength of light used was 5.5 × 10-7 m. The orbital velocity of the earth is taken to be 30 kms/ sec. Estimate the fringe shift to be expected.

(d) A diffraction grating has 5000 lines per cm. For illumination at normal incidence, determine the dispersive power of the grating in the second order spectrum in the range of wavelengths around 500 n.m.

(e) The vibrations of a string fixed at both ends is represented by the equation y = 2 sin (π x)/(3) cos 50 π t (m). If the above stationary wave is produced due to the superposition of two component waves of the same frequency, velocity and amplitude travelling in opposite directions, find (i) the exact equations of the displacements associated with the vibrations of the component waves and (ii) the distance between two consecutive nodes of the stationary wave.

Section A

Q2.

(a) What are cyclic coordinates for a system of particles? Discuss the significance of the Hamilton's principle.

(b) Using Euler's equations for a force free motion of a rigid body, show that the Kinetic energy remains constant throughout the motion of the rigid body.

Section A

Q3.

(a) Write the components of the velocity 4-vector of a particle in an inertial frame S. How does the four velocity transform to another inertial frame S'? Obtain the Einstein's law of addition of velocities from the above transformations.

Question paper preview

Scanned pages 1–2 for reference. Download the official PDF for the full paper.

Page 1
IFS Exam 2016 Physics Paper I question paper page 1 instructions scan PDF download. UPSC IFS 2016 Physics Paper I exam header and instructions.
Page 2
IFS Exam 2016 Physics Paper I question paper page 1 instructions scan PDF download. UPSC IFS 2016 Physics Paper I exam header and instructions.

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Frequently asked questions

What is the name of the exam?

The exam is the I.F.S. EXAM.

What year is this question paper from?

This question paper is from the year 2016.

Which conducting body organized this exam?

The exam was conducted by UPSC.

What is the subject and paper name?

The subject is Physics, and the paper is Physics Paper I.

What is the maximum marks for this paper?

The maximum marks for Physics Paper I is 200.

What is the allowed time duration for the exam?

The allowed time duration is Three Hours.

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