Home
Looking for Previous Year IAS Papers? Download now free!
You will be auto-sent a link to download the IAS Past Papers & Model Papers when you join the IAS Free Training Group

Home | Downloads | Careers | Books |IAS Online TutorialsIAS online Tutorials | Advertise Advertise| Contact Us | About Us | ForumForum| Link to usLink to us
Login Thursday, April 24, 2014

IAS Resources
About IAS
IAS Preparation
IAS Careers
IAS Syllabus
IAS Online Tutorials
IAS Free Online Exam
Indian Forest Service
Indian Engineering Service
Indian Foreign Service
Indian Police Service
Record and Opinion
Books and Links
Free Downloads
Miscellaneous


Home » IAS Sample Papers » Physics Sample Papers » IAS Physics Paper (Main)

IAS Physics Paper (Main)

A D V E R T I S E M E N T
>

Answers must be written in the medium specified in the Admission Certificate issued to you, which must be stated clearly on the cover of the answer book in the space provided for the purpose. No marks will be given for the answers written in a medium other than that specified in the Admission Certificate.

Candidates should attempt Questions 1 and 5 which are compulsory, and any three of the remaining questions selecting at least one question from each section.

Assume suitable data if considered necessary and indicate the same clearly.

All questions carry equal marks.

SECTION A.

1. Answer any three of the following:

(a) Using the rocket equation and its integral find the final velocity of a single stage rocket. Given that (i) the velocity of the escaping gas is 2500 m/s, (ii) the rate of loss of mass is. (where m0) is the initial mass and 0.27 m0 is the final mass).

(b) Two spaceships are moving at a velocity of 0.9 c relative to the Earth in opposite directions. What is the speed of one spaceship relative to the other? (c = velocity of light)

(c) A wave is represented by Find wavelength , velocity v, frequency f and the direction of propagation. If it interferes with another was given , find the amplitude and the phase of the resultant wave (All dimensions are in SI system).

(d) Derive the expression for resolving power of a diffraction grating with N lines. Calculate the minimum number of lines in the diffraction grating if it has to resolve the yellow lines of sodium (589.0 nm and 589.6 nm) in the first order.

2. (a) Using the Lagrangian for the system of a planet and the Sun obtain the equation of motion. Use them to get the equations for the orbit.

(b) Derive the relationship between the impact parameter and the scattering angle for the scattering of an particle of charge +2e by a nucleus of charge +Ze. Calculate the impact parameter for an angle of deflection of 30o if the kinetic energy of the alpha particle is 610-13 J.

3. (a) State Fermat's principle. Apply it to get the laws of reflection from a plane surface.

(b) The phase velocity of the surface wave in a liquid of surface tension T and density is given by . Show that the group velocity vg of the surface wave is given by

3. (c) An observer A sees two events at the same space point () and separated in time by t=10-6 s. Another observer B sees them to be separated t' = 310-6 s. What is the separation in space of the tow events as observed by B? What is the speed of B relative to A?

4. (a) How do you know that the light is a transverse wave? What is a quarter wave plate? How is it constructed?

(b) Discuss the Fresnel diffraction pattern formed by a straight edge using the Cornu's spiral.

(c) In an experiment using a Michelson interferometer, explain with the help of suitable ray diagrams

(i) Why do we need extended source of light,

(ii) Why do we get circular fringes, and

(iii) Shifting of fringes inwards or outwards as we shift the movable mirror.

SECTION B

5. Solve any three of the following:

5. (a). Calculate the electric field for a point on the axis of a uniform ring of a charge 'q' and radis a. Where does the maximum value occur.

(b) Show that the potential energy of a charge Q uniformly distributed throughout the sphere of radius R is give by .

(c) Describe Carnot cycle and show that efficiency is given by , where the symbols have their usual meaning.

(d) Derive the Bose-Einsten distribution for an ideal gas.

6. (a) Using Kirchoff's laws find currents in each branch of the circuit shown in the following diagram.

(b) A Geiger tube consists of a wire a wire of radius 0.2 mm and length 12 cm and a co-axial metallic cylinder of radius 1.5 cm and length 12 cm. Find

(i) the capacitance of the system, and

(ii) the charge per unit length of the wire when the potential difference between the wire and the cylinder is 1.2 kV.

(c) A series LCR circuit with L = 2 H, C = 2 F and R = 20 ohm is powered by a source of 100 volts and variable frequency. Find

(i) the resonance frequency, fo,

(ii) the value of Q

(iii) the width of resonance f and

(iv) the maximum current at resonance.

7. (a) Why did Maxwell have to introduce the idea of displacement current? Derive the wave equation from Maxwell's laws. Obtain Fresnel's formula for reflection and transmission coefficients of the electric vector when it is perpendicular to the plane of incidence.

(b) What are vector and scalar potentials for the electromagnetic field? Are they unique? Explain what are Coulomb's and Lorentz gauges. Derive the electromagnetic wave equation in Lorentz gauge and show that it is equivalent to Maxwell's equation.

8.(a) Discuss the phenomenon of Bose-Einstein condensation. Obtain the expression for the condensation temperature. Briefly comment on observation of Bose-Einstein condensate.

(b) A bulb filament is constructed from a tungsten wire of length 2 cm and diameter 50 m. It is enclosed in a vacuum bulb. What temperature does it reach when it is operated at a power of 1 watt? Given:

(i) Emissivity of tungsten = 0.4

(ii) Stefan's constant = 5.6710-8 watt/m2K4.



More IAS Sample Papers
1


Comment By: Monica Chhandwal
these sample papers are to the point and by preparing these one can surely crack the ias exam.......
5/26/2011
Discussion Center

Discuss

Query

Feedback/ Suggestion

Yahoo Groups

Sirfdosti Groups

Contact Us







Members Login Here!
EmailId:
Password:


Forgot Password?
New User? Register!
Toppers View



INTERVIEW EBOOK
Get 9,000+ Interview Questions & Answers in an eBook. Interview Question & Answer Guide
  • 9,000+ Interview Questions
  • All Questions Answered
  • 5 FREE Bonuses
  • Free Upgrades

IAS PREPARATION EBOOKS

IAS Exam, IAS 2014, IAS 2015 Training, IAS 2013 Papers and Solutions, IAS Preparation & Related Pages


IAS Forum | Civil Services | IAS Overview | How to Prepare for IAS | IAS Eligibility Criteria | IAS Exam Pattern | IAS Exam Syllabus | IAS Application Form Centers | Sections Under IAS Examinations | Postings of an IAS Officer | Method of Making Notes | Style of Answering Questions | Time Management | IAS Regulations | Cut off Marks in IAS | Training Institutes for IAS | IAS Tips | Time Table for IAS 2014 Exam | Calendar for IAS 2014 Exam | Top Scorers in IAS Exam | Post Offices for IAS Exam Form | Sample IAS Exam Paper | IAS Current Affairs | Career in IAS | Jobs Offered in IAS | Nature of Work | Interview Tips for IAS | Interview Techniques for IAS | IAS Syllabus | IAS Preparation Strategy | IAS Model Notification | Daily / Periodicals for IAS | Art and Craft | IAS Tutorials | IAS Tutorials for Agriculture | IAS Tutorials for Animal Husbandry & Veterinary Science | IAS Tutorials for Botany | IAS Tutorials for Chemistry | IAS Tutorials for Economics | IAS Tutorials for Essay | IAS Tutorials for Geography | IAS Tutorials for Geology | IAS Tutorials for Indian History | IAS Tutorials for Physics | IAS Tutorials for Psychology | IAS Tutorials for Sociology | IAS Tutorials for Zoology | Previous Years Test Papers for IAS | IAS Mock Exam | Current Affairs for IAS | IFS - Indian Forest Services | IFS - Indian Forest Services Examination Plan | IFS - Indian Forest Services General Instructions | IFS - Indian Forest Services - List of Head Post Offices | IFS - Indian Forest Services Special Instructions | IES - Indian Engineering Service | IES - Indian Engineering Service Model Notification | IES - Indian Engineering Service General Instructions | IES - Indian Engineering Service Examination Plan | IFS - Indian Foreign Service | IFS - Indian Foreign Service - Selection & Training | Career in IFS - Indian Foreign Service | IPS - Indian Police Service - Modern Ranks and Rank Badges | IPS - Indian Police Service in History | IPS - Indian Police Service - External Resources | Reward of Brilliance | Deputation | Civil Lines | IAS Toppers Opinion | Renumeration in IAS | AKHAND PRATAP SINGH - IAS Topper | Anay Dwivedi - IAS Topper | Anupama - IAS Topper | D DIVYA - IAS Topper | Divyadharshini - IAS Topper | Divyadharshini Shanmugam - IAS Topper | Dr Sumit Seth - IAS Topper | GAGAN - IAS Topper | Garima Mittal - IAS Topper | GARIMA MITTAL - IAS Topper | Iqbal Dhalibal - IAS Topper | Iva Sahay - IAS Topper | JAI PRAKASH MAURYA - IAS Topper | Karthik Adapa - IAS Topper | Mangesh Kumar - IAS Topper | Manish Ranjan - IAS Topper | Muthyala Raju Revu - IAS Topper | Nila Mohan - IAS Topper | Pankaj Dwivedi - IAS Topper | PC Vinoj Kumar - IAS Topper | Prasad Praladh Akkanouru - IAS Topper | Prince Dhawan - IAS Topper | R V Varun Kumar - IAS Topper | RAVI DHAWAN - IAS Topper | Roopa Mishra - IAS Topper | Rukmani Riar - IAS Topper | SASWATI DEY - IAS Topper | Saswati Dey - IAS Topper | Shah faesal - IAS Topper | Shena Agrawal - IAS Topper | Sorabh Babu Maheshwari - IAS Topper | Sweta Mohanty - IAS Topper | TANVI SUNDRIYAL - IAS Topper | Vijayalakshmi Bidari - IAS Topper | IAS Books | SSC Exam Pattern | CDSC Exam Pattern | NDA Exam Pattern | GA - General Awareness Exam Pattern | PG - Post Graduate Exam Pattern |
Copyright © 2014. One Stop IAS.com. All rights reserved Privacy Policies | Terms and Conditions | About Us
Our Portals : Free eBooks | Interview Questions | IndiaJobForum | Free Classifieds | Vyoms | One Stop FAQs | One Stop GATE | One Stop GRE | One Stop IAS | One Stop MBA | Free SAP Training | One Stop Testing | Web Hosting | Sirf Dosti | Your Project Code | Cook Book Global | Tests World | Clean Jokes | Vyom | Vyom eBooks | Vyom Links | Vyom World | Shayari | C Interview Questions | C++ Interview Questions | Send Free SMS | Placement Papers | SMS Jokes | CAT 2014 Notification