CSS 2016 Physics Combined Papers Past Paper

Paper details

Examination

CSS

Year

2016

Subject

Physics

Paper

Combined Papers

Subject type

Optional

Mode

Subjective

Questions recorded from this paper

These 12 question wordings are transcribed from CSS Vista’s structured Physics past-paper record for CSS 2016.

1. Q6 · Mechanics(a) Derive equation of Lorentz velocity transformations and show that speed of (12) light is independent of the relative motion between the frames of reference. (b) The siren of a police car emits a source tone at a frequency of 1125 Hz. Find the (8) frequency that would you receive in your car under the following circumstances. (i) Your car at rest, police car moving towards you at 29 m/s. (ii) Police car at rest , your car moving towards it at 29 m/s. (iii) Your and police car are moving towards one another at 14.5 m/s. (iv) Your car moving at 9 m/s, police car chasing behind you at 38 m/s.
2. Q2 · Gradient(a) State and prove Stoke’s theorem. (8) (b) Prove that if the vector is the gradient of a scalar function then its line integral (4) around a closed curve is zero. (c) A particle moves along the curve x = 2t2, y = t2- 4t , z = 3t-5 where t is the (8) time. Find the components of its velocity and acceleration at time t=1 in the direction 2i-3j+2k
3. Q4 · planetary motion and satellites(a) State and prove the Kepler’s law of areas and Kepler’s law of periods of (8) planetary motion. (b) A satellite orbits at a height of 230km above the Earth surface. What is the (6) period of satellite? (c) At what altitude above the earth surface the value of ‘g’ is three quarters of its (6) value at the surface of the earth.
4. Q5 · Diffraction Gratings and their resolving power(a) What is diffraction grating? Explain how grating diffracts light. Derive relation (12) for resolving power of grating. (b) What is meant by polarization of light? How can we get a plane polarized light (8) by a polarizing sheet?
5. Q7 · entropy(a) Define Entropy. State Second law of thermodynamics in terms of Entropy. (8) (b) Discuss applications of First Law of thermodynamics. (6) (c) Discuss briefly the Lissajous patterns. (6)
6. Q8 · Brownian motionExplain any FOUR of the following terms. (05 each) (20) (a) Doppler’s Effect (b) Bernoulli’s theorem (c) Newton’s rings (d) He-Ne Gas LASER (e) Brownian motion Roll Number
7. Q3 · Electricity and Magnetism(a) Differentiate between a series and parallel resonant circuits. (6) (b) Explain the construction and operation of a transformer. What are energy losses in (10) a transformer and how are they reduced to a minimum. (c) A series LCR circuit contains a coil with L=2.25H, a capacitor having C=16μF (4) and a resistor with R=50Ω. Calculate the impedance and the phase difference between current and voltage. (Take frequency f = 50Hz)
8. Q2 · Poisson and Laplace’s equations(a) Define electric field intensity ⃗ . 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 & (8) Laplace’s equations. (c) A charge of 10√2 Coulomb is located at 3i + 4j + 5 . Calculate the electric (4) field intensity at a point having position vector 5i + 4j + 3 .
9. Q4 · Modern and Quantum Physics(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)
10. Q6 · Crystal lattice and structure(a) What do <111>, [010], (111), and {100} represents for a cubic crystal lattice. (5) (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)
11. Q5 · Solid State Physics(a) Why the resistivity of metals increases with temperature but that of semiconductor (6) decreases? (b) In the process of making semiconductor devices, why silicon is preferred over (4) Germanium? (c) Briefly explain the construction and operation of a Bipolar Junction Transistor (10) (BJT). How it can be used as an Amplifier?
12. Q7 ·  and  decayDefine Curie and Becquerel. Establish the relation between them. (6) Calculate the Decay Constant for 14C which has half-life of 5730 years. (4) State and explain Half-life and Mean life of a radioactive element. Show that < T > is (10) greater than T1/2.

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