Prep Right
Questions › CSS › Physics › 2009
FPSC · CSS 2009

Physics, Paper I

100 marks · 3 hours · 7 questions
Practice 15 MCQs
This paper Physics · all yearsQ. 2 · Define gradient. Find the gradient…Q. 3 · What is theory of relativity?…Q. 4 · State and prove Bernoulli's Theorem.Q. 5 · Describe waves and its types.…Q. 6 · What is interference of waves?…Q. 7 · State and explain Second Law…Q. 8 · Write short notes on ANY…With this paperPart-I MCQs152009 →
3 hours · questions hide until you reveal them

Not yet checked 4 of 7 questions have not yet been compared with the official paper.

Part II

Q. 2
  1. (a)Define gradient. Find the gradient of the magnitude of a position vector r. What conclusion do you derive from your result? [4]
  2. (b)Sketch a function V = -yx^ + xy^. Find curl V. What would be its divergence? [6]
Not yet checked
(10)
Q. 3
  1. (a)What is theory of relativity? Consider two inertial frames, A and B, with axes parallel and origins O,O' coinciding at t = t' = 0 and B moving with uniform velocity v along x-axis of A. Letting γ = 1 / 1 − ( v 2 / c 2 ) \gamma = 1/\sqrt{1-(v^2/c^2)} γ = 1/ 1 − ( v 2 / c 2 ) ​ , the Lorenz transformation A \rightarrow B is x ′ = γ ( x − v t ) , y ′ = y , z ′ = z , t ′ = γ ( t − v x / c 2 ) x' = \gamma(x − vt), y' = y, z' = z, t'= \gamma(t − vx/c²) x ′ = γ ( x − v t ) , y ′ = y , z ′ = z , t ′ = γ ( t − v x / c 2 ) . From the principle of equivalence of inertial frames infer the inverse Lorenz transformation B \rightarrow A. [8]
  2. (b)We can write one of Maxwell's equation of B in inertial frame 1 as B B⋅dl1=μ0(ϵ0∂ϕe1/∂t1=i1)B \cdot dl_1 = \mu_0 (\epsilon_0 \partial \phi_{e1}/\partial t_1 = i_1) . Write it in inertial frame 2 according to Einstein's principle of relativity. Does B1=B2B_1 = B_2 ? [4]
Not yet checked
(12)
Q. 4
  1. (a)State and prove Bernoulli's Theorem. [12]
  2. (b)If the speed of flow past the lower surface of an airplane wing is 110 m/s. What speed of flow over the upper surface will give a pressure difference of 900 Pa between upper and lower surface? Take the density of air to be 1.3 1.3×10−3 g/cm31.3 \times 10^{-3} \text{ g/cm}^3 . [8]
Not yet checked
(20)
Q. 5
  1. (a)Describe waves and its types. Derive an expression for speed of wave on a stretched string by Newton's second law. [8]
  2. (b)The equation of a transverse wave on a string is Y = ( 2 mm ) sin ⁡ [ ( 20 m − 1 ) x – ( 600 s − 1 ) t ] Y = (2 \text{mm}) \sin [(20 \text{m}^{-1})x – (600 \text{s}^{-1})t] Y = ( 2 mm ) sin [( 20 m − 1 ) x – ( 600 s − 1 ) t ] . The tension in the string is 15N. What is the wave speed? Find the linear density of this string in grams/meter. [4]
Not yet checked
(12)
Q. 6
  1. (a)What is interference of waves? Describe all the necessary conditions for constructive and destructive interference. Explain one interferometer. [6]
  2. (b)Two sound waves from two coherent sources with same frequency 450 Hz are traveling in the same direction at 330 m/s. What is the phase difference of the waves at a point that is 4.4m from one source and 4m from the other source. [8]
(14)
Q. 7
  1. (a)State and explain Second Law of Thermodynamics. Prove that Clausius and Kelvin-Plank statements of it are equivalent. [6]
  2. (b)A Carnot engine operates between the temperatures 850 K and 300 K. The engine performs 1200 J of work each cycle, which takes 0.25 s. Calculate its efficiency and its average power. What are the rates of heat input and heat exhaust per cycle? [8]
(14)
Q. 8

Write short notes on ANY TWO of the followings:

  1. (i)Laser and its applications [10]
  2. (ii)Classical Maxwell-Boltzmann Statistics [10]
  3. (iii)Dynamics of rigid bodies [10]
(20)

Related papers

Physics 2009Physics 2010Physics 2010Physics 2011Physics 2012Physics 2013Physics 2013Physics 2014Physics 2014Physics 2015Physics 2015Physics 2016Physics 2016Physics 2017Physics 2018Physics 2018Physics 2019Physics 2019Physics 2020Physics 2020Physics 2021Physics 2021Physics 2022Physics 2023Physics 2023Physics 2024Physics 2024Physics 2025Physics 2025Physics 2026Physics 2026Accountancy & Auditing 2009Agriculture 2009Business Administration 2009Chemistry 2009Chemistry 2009Computer Science 2009Constitutional Law 2009Current Affairs 2009Economics 2009Economics 2009English Essay 2009English (Précis & Composition) 2009European History 2009European History 2009Forestry 2009Geography 2009Geography 2009Geology 2009Geology 2009History of Pakistan & India 2009History of Pakistan & India 2009International Relations 2009Islamic Studies 2009Muslim Law & Jurisprudence 2009Pakistan Affairs 2009Physics 2009Political Science 2009Political Science 2009Psychology 2009Psychology 2009Public Administration 2009Pure Mathematics 2009Sindhi 2009Sociology 2009

About this paper

The 2009 CSS Physics paper set by the FPSC. Question wording only; questions marked “Not yet checked” have not been compared with the official paper yet.

Disclaimer Prep Right is independent and not affiliated with FPSC.