# Physics Punjab PMS Paper I 2019

PUNJAB PUBLIC SERVICE COMMISSION

COMBINED COMPETITIVE EXAMINATION FOR

RECRUITMENT TO THE POSTS OF

PROVINCIAL MANAGEMENT SERVICE-2019

SUBJECT: PHYSICS (PAPER – I)

TIME ALLOWED: THREE 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 the Law of Conservation of Linear Momentum. (10 Marks)

(b) Explain gyroscope and its precession. (10 Marks)

Q No. 8: Write a short note on the following: (4 x 5 = 20 Marks)

(i) Kepler’s laws of planetary motion (ii) Surface tension (iii) Newton’s Rings (iv) Fermi-Dirac statistics