(a)Define electric field intensity Ē. State its value for a point charge and give its units. [8]
(b)State differential form of Gauss's law and from there develops the poisson's & Laplace's equations. [8]
(c)A charge of 10√2 Coulomb is located at (3i + 4ĵ + 5k)m. Calculate the electric field intensity at a point having position vector (5i + 4ĵ + 3k)m. [4]
(20)
Q. 3
(a)Differentiate between a series and parallel resonant circuits. [6]
(b)Explain the construction and operation of a transformer. What are energy losses in a transformer and how are they reduced to a minimum. [10]
(c)A series LCR circuit contains a coil with L=2.25H, a capacitor having C=16µF and a resistor with R=50Ω. Calculate the impedance and the phase difference between current and voltage. (Take frequency f = 50Hz) [4]
(20)
Q. 4
(a)State and explain the basic postulates of Quantum Physics. [5]
(b)Briefly explain with examples what do you mean by Eigen function and Eigen values. [5]
(c)Derive the time-dependent Schrodinger Wave Equation for a free particle. [10]
(20)
Q. 5
(a)Why the resistivity of metals increases with temperature but that of semiconductor decreases? [6]
(b)In the process of making semiconductor devices, why silicon is preferred over Germanium? [4]
(c)Briefly explain the construction and operation of a Bipolar Junction Transistor (BJT). How it can be used as an Amplifier? [10]
(20)
Q. 6
(a)What do <111>, [10]
(b)What is packing factor? Determine the Atomic Packing factor of FCC lattice. [5]
(c)With neat diagram showing X-ray diffraction, derive an expression for Bragg's Law. [10]
(20)
Q. 7
(a)Define Curie and Becquerel. Establish the relation between them. [6]
(b)Calculate the Decay Constant for 14C which has half-life of 5730 years. [4]
(c)State and explain Half-life and Mean life of a radioactive element. Show that <T> is greater than T 1/2 . [10]
The 2016 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.