Not yet checked 4 of 7 questions have not yet been compared with the official paper.
Part II
Q. 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]
Not yet checked
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Q. 3
(a)Explain the working mechanism of the moving coil microphone and electric guitar. [3]
(b)Explain the working mechanism of the Ground Fault Circuit Interrupter (GFCI) and walk-through metal detector. [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]
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Q. 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]
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Q. 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.
(c)What are the advantages of digital signal over analog signal? [4]
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Q. 6
(a)Explain the Lyman, Balmer and Paschen series of atomic hydrogen.
(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]
Not yet checked
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Q. 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]
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Q. 8
(a)Explain the working mechanism of the scintillation counter and bubble chamber in detail.
(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 2014 CSS Physics paper set by the FPSC. Question wording only; questions marked “Not yet checked” have not been compared with the official paper yet.
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