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FPSC · CSS 2015

Physics, Paper I

100 marks · 3 hours · 7 questions
This paper Physics · all yearsQ. 2 · How does a vector quantity…Q. 3 · Describe Michelson-Morley experiment and show…Q. 4 · What is length contraction in…Q. 5 · Explain the formation of Newton's…Q. 6 · What is a LASER? Explain…Q. 7 · Distinguish between the resolving power…Q. 8 · Briefly discuss any FOUR of…With this paper← 20142015 →
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Part II

Q. 2
  1. (a)How does a vector quantity differ from a scalar quantity? [6]
  2. (b)A small airplane leaves an airport on an overcast day and is later sighted 215 km away in a direction making an angle of 22º east of north. How far east and north is the airplane from the airport when sighted? [8]
  3. (c)Explain the conservation of linear momentum and angular momentum. [6]
(20)
Q. 3
  1. (a)Describe Michelson-Morley experiment and show how negative results obtained from this experiment were interpreted? [10]
  2. (b)What is time dilation in special relativity? Obtain an expression for time dilation regarding time interval between two events measured from two different inertial frames. [10]
(20)
Q. 4
  1. (a)What is length contraction in special theory of relativity? [4]
  2. (b)What are isothermal and adiabatic changes? Explain with volume pressure diagram. [8]
  3. (c)Define the term Coherence. Drive an Expression for the Coherence length of a wave train that has a frequency bandwidth Δv. [8]
(20)
Q. 5
  1. (a)Explain the formation of Newton's rings and show that the radii of m th dark ring is proportional to the under root of wavelength. [10]
  2. (b)What is diffraction grating? Define grating element. Explain how a plane transmission grating is used to determine the wavelength of light. [10]
(20)
Q. 6
  1. (a)What is a LASER? Explain with neat diagram the process of absorption of light, spontaneous emission and stimulated emission of light. [8]
  2. (b)Explain with the help of energy level diagram how stimulated emission results from electron impact of He-Ne Gas LASER? [6]
  3. (c)Explain how the viscosity of a given liquid is determined using Stokes's method experimentally? [6]
(20)
Q. 7
  1. (a)Distinguish between the resolving power and the magnifying power of a Telescope. [8]
  2. (b)Discuss the applications of First Law of Thermodynamics. [6]
  3. (c)Describe the Galileo's principles of relativity. [6]
(20)
Q. 8

Briefly discuss any FOUR of the following terms:

  1. (a)Standing waves [5]
  2. (b)Doppler's effect [5]
  3. (c)Electromagnetic waves [5]
  4. (d)Surface tension [5]
  5. (e)Components of vectors [5]
(20)

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The 2015 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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