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FPSC · CSS 2014

Physics, Paper I

100 marks · 3 hours · 7 questions
This paper Physics · all yearsQ. 2 · Define a Scalar field. Obtain…Q. 3 · Distinguish between Linear and Angular…Q. 4 · Show that the work done…Q. 5 · Describe Einstein's postulates of special…Q. 6 · Distinguish between streamline and turbulent…Q. 7 · Define Entropy. State second law…Q. 8 · Explain the phenomenon of diffraction…With this paper← 20132014 →
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Not yet checked 2 of 7 questions have not yet been compared with the official paper.

Part II

Q. 2
  1. (a)Define a Scalar field. Obtain an expression for the Gradient of a Scalar field. Why the Gradient of a Scalar field is vector? [11]
  2. (b)Given ϕ(x,y,z)=x2yz3\phi(x,y,z) = x^2yz^3 , Find grad ϕ\phi at (1, 2, 1). [5]
  3. (c)For what value of 'a' the vector A=2i+aj+kA=2i+aj+k and B=4i−2j−2kB=4i-2j-2k are perpendicular. [4]
Not yet checked
(20)
Q. 3
  1. (a)Distinguish between Linear and Angular momentum. Explain the laws of conservation of Angular momentum. Prove that the angular momentum is constant in the absence of external torque. [13]
  2. (b)The angular momentum of a particle is given as: J=8t3i−2t2j+12tkJ=8t^3i-2t^2j+12tk Find the torque τ\tau at t=1 [7]
Not yet checked
(20)
Q. 4
  1. (a)Show that the work done by a constant force is equal to the difference of initial and final kinetic energies of the body. [10]
  2. (b)Prove that the total Work done by a conservative force around a closed path is ZERO and is independent of the path. [10]
(20)
Q. 5
  1. (a)Describe Einstein's postulates of special theory of Relativity. [10]
  2. (b)Establish the Mass-Energy relationship. [6]
  3. (c)What is the speed of the air craft whose clock runs one second slow per hour, relative to a clock on the earth [C=3x10 8 m/sec] [4]
(20)
Q. 6
  1. (a)Distinguish between streamline and turbulent motion of a liquid. [3]
  2. (b)What is “Coefficient of Viscosity”? Explain in detail the Stoke's law applicable in determining the coefficient of viscosity of a viscous liquid experimentally. [14]
  3. (c)Why do automanufacturers recommend using different viscosities of Engine oil in cold and hot climate? [3]
(20)
Q. 7
  1. (a)Define Entropy. State second law of thermodynamics in terms of entropy. [13]
  2. (b)Show that the entropy remains constant in a reversible process but increases in an irreversible one. [3]
  3. (c)Distinguish between Isothermal and Adiabatic process. [4]
(20)
Q. 8
  1. (a)Explain the phenomenon of diffraction from a Single Slit and a diffraction grating. Discuss conditions for maxima and minima in both cases. [16]
  2. (b)Differentiate between Fresnel and Fraunhofer's diffraction. [4]
(20)

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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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