Thread: Physics Papers 2014
View Single Post
  #2  
Old Friday, May 29, 2015
Last Island's Avatar
Last Island Last Island is offline
Royal Queen of Literature
Medal of Appreciation: Awarded to appreciate member's contribution on forum. (Academic and professional achievements do not make you eligible for this medal) - Issue reason: AppreciationModerator: Ribbon awarded to moderators of the forum - Issue reason: Best Moderator Award: Awarded for censoring all swearing and keeping posts in order. - Issue reason: Best ModMember of the Year: Awarded to those community members who have made invaluable contributions to the Community in the particular year - Issue reason: 2008Gold Medal: Awarded to those members with maximum number of reputation points. - Issue reason: For the year 2007, 2008, 2009, 2010, 2011Diligent Service Medal: Awarded upon completion of 5 years of dedicated services and contribution to the community. - Issue reason: More than 5 years of dedicated services
  
Join Date: May 2005
Location: Forest of Fallen Stars
Posts: 7,585
Thanks: 2,427
Thanked 15,848 Times in 5,006 Posts
Last Island is headed toward stardomLast Island is headed toward stardomLast Island is headed toward stardomLast Island is headed toward stardomLast Island is headed toward stardomLast Island is headed toward stardomLast Island is headed toward stardomLast Island is headed toward stardomLast Island is headed toward stardomLast Island is headed toward stardomLast Island is headed toward stardom
Default
FEDERAL PUBLIC SERVICE COMMISSION
COMPETITIVE EXAMINATION FOR
RECRUITMENT TO POSTS IN BS-17
UNDER THE FEDERAL GOVERNMENT, 2014

PHYSICS , PAPER - II

TIME ALLOWED: THREE HOURS
(PART-I MCQs) 30 MINUTES MAXIMUM MARKS: 20
(PART-II) 2 HOURS & 30 MINUTES MAXIMUM MARKS: 80

NOTE: (i) Part-II is to be attempted on the separate Answer Book.
(ii) Attempt ONLY FOUR questions from PART-II. ALL questions carry EQUAL marks.
(iii) Candidate must write Q. No. in the Answer Book in accordance with Q. No. in the Q. Paper.
(iv) No Page/Space be left blank between the answers. All the blank pages of Answer Book must be crossed.
(v) Extra attempt of any question or any part of the attempted question will not be considered.

PART-II

Q.NO.2. (a) A nonconducting disk of radius R has a uniform positive surface charge density σ. Find the electric field at a point along the axis of the disk a distance x from its center. Assume that x is positive. (9)
(b) Explain the use of dielectric materials between the conducting plates of the capacitor? (6)
(c) The parallel plates of a 1.0 F capacitor are 1.0 mm apart. What is their area? (5)

Q.NO.3. (a) Explain the working mechanism of the moving coil microphone and electric guitar. (3+3)
(b) Explain the working mechanism of the Ground Fault Circuit Interrupter (GFCI) and walk-through metal detector. (3+3)
(c) An observer is 1.8 m from a light source (of dimensions much smaller than 1.8 m) whose power output is 250 W. Calculate the rms value of electric field at the position of the observer. Assume that the source irradiates uniformly in all directions. (8)

Q.NO.4. (a) Enlist the practical applications of the diode. (5)
(b) Explain volt-ampere characteristics of the diode. (6)
(c) Differentiate between insulator, conductor and semiconductor materials using energy band gap approach. (9)

Q.NO.5. (a) State and explain the amplitude modulation in communication systems. (8)
(b) Explain the construction of PNP transistor and give its one practical application in detail. (4+4)
(c) What are the advantages of digital signal over analog signal? (4)

Q.NO.6. (a) Explain the Lyman, Balmer and Paschen series of atomic hydrogen. (3+3+3)
(b) State and explain photoelectric effect. (5)
(c) Some major features of photoelectric effect cannot be explained in the terms of classical wave theory of light, discuss in detail. (6)

Q.NO.7. (a) Explain Zeeman effect in the context of energy level diagram. (8)
(b) Explain dual nature of light. (4)
(c) State and explain Heisenberg’s uncertainly principle. (8)

Q.NO.8. (a) Explain the working mechanism of the scintillation counter and bubble chamber in detail. (4+4)
(b) State and explain nuclear fission giving at least three examples. (6)
(c) A small cyclotron of maximum radius R=0.25 m accelerates protons in a 1.7 T magnetic field. Calculate
(i) the frequency needed for the applied alternating voltage, and
(ii) the kinetic energy of the protons when they leave the cyclotron. (6)
*************
__________________
The Me you have always known, the Me that's a stranger still.
Reply With Quote