PUNJAB PUBLIC SERVICE COMMISSION
Combined Competitive Examination (CCE) 2019
For Recruitment to the Posts of Provincial Management Service (PMS)
SUBJECT: Physics (PAPER-I)
Time Allowed: 3 Hours
MAXIMUM MARKS: 100
NOTE: Attempt Five Questions in All. Attempt in Urdu or English.
Q No. 1: (a) Prove that a positively charged particle projected at right angles to a uniform magnetic field B, describes a circle. (10 Marks)
(b) Discuss motion of satellites and derive mathematical expressions for speed and time period. (10 Marks)
Q No. 2: How does the Michelson Morley experiment prove that the velocity of light is the same when measured along two perpendicular directions in a frame of reference which is supposed to be moving relative to the either? (20 Marks)
Q No. 3: (a) Describe travelling waves and discuss sinusoidal waves also. (10 Marks)
(b) What are the stationary waves? Analyze standing waves mathematically. (10 Marks)
Q No. 4: (a) Derive electromagnetic wave equation. (10 Marks)
(b) Explain grating spectrometer and its resolution. (10 Marks)
Q No. 5: (a) How can you produce and measure low temperatures? Explain in detail. (10 Marks)
(b) Describe in detail third law of thermodynamics. (10 Marks)
Q No. 6: State and derive Gauss’s and Stoke’s theorems. (20 Marks)
Q No. 7: (a) State and explain Law of Conservation of Linear Momentum. (10 Marks)
(b) Explain gyroscope and its precession. (10 Marks)
Q No. 8: Write short note on the following: (4×5=20 Marks)
(i) Kepler’s laws of planetary motion
(ii) Surface tension (iii) Newton’s Rings
(iv) Fermi-Dirac statistics —
SUBJECT: Physics (Paper-II)
Time Allowed: 3 Hours
Maximum Marks: 100
NOTE: Attempt Five Questions in All. Selecting ONE from Section-I and TWO each from Section-II and III. Calculator is allowed (Not Programmable). Attempt in Urdu or English.
SECTION-I
Q No. 1: a) Define Compton Effect. Derive an expression for Compton Shift in wavelength.
b) If the wavelength of incident X-rays is 1.5 Å, calculate the frequency of X-rays scattered at an angle of 60∘ in Compton Scattering. (Where h=6.63×10−34 J.s, m=9.11×10−31 Kg, c=3×108 m/s)
Q No. 2: a) State Maxwell’s equation in words and through appropriate differential and integral forms.
b) Use Ampere’s law to show that the magnitude of the magnetic field inside an infinitely long solenoid, with “n” turns of wire per unit length and current “I” passing through it is given by B=μ0nI. c) Calculate the voltage of a battery connected to a parallel plate capacitor with a plate area of 2.0 cm2 and a plate separation of 2.0 mm if the charge stored on the plates is 4.0 pC. —
SECTION-II
Q No. 3: a) What is the Law of Radioactivity. Derive an expression for mean life of radioactive element by using this law.
b) How much percent radioactive atoms of a radioactive substance will be left after three mean lives.
Q No. 4: a) Write a note on working of an operational amplifier.
b) Discuss the operation of J-K flip flops.
Q No. 5: a) What is diode? Explain the working of full wave rectifier.
b) Define transistor (BJT). Explain cutoff, saturation, and active region. —
SECTION-III
Q No. 6: a) Write a brief note on nuclear models.
b) Define nuclear fission and fusion. What is role of moderation in nuclear reactor?
c) Indium-115 has a half-life equal to 4.5 hours. If the sample were originally 12 mg how much would remain after 13.5 hours?
Q No. 7: Write a note on the following: (4X5=20 Marks) a) Zeeman Effect
b) Pair production
c) Heisenberg’s Uncertainty Principle d) Quantum Numbers
Q No. 8: a) Write a note on Mass spectrometer.
b) Differentiate between Poisson and Laplace’s Equation.
c) Monochromatic light of wavelength λ=400 nm strikes a plate of Cesium. Cesium has a work function of 2.14 eV. What is the energy of the electrons ejected? —
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