PHYSICS EXAM (FEDERAL PUBLIC SERVICE COMMISSION)

Jun 17th, 2015
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1. (a) Find a unit vector which is perpendicular to the vectors î +j and j + ?. (5) (b) If A = xz î – y2 j + 2x2y?ˆ and =x2yz2, find (15) 2. (a) Define angular momentum of a single particle and derive a relation between torque and angular momentum.

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Year 2000FEDERAL PUBLIC SERVICE COMMISSIONCOMPETITIVE EXAMINATION FOR RECRUITMENT TO POSTSIN BPS - 17 UNDER THE FEDERAL GOVERNMENT, 2000PHYSICS PAPER - ITIME ALLOWED: 3 HOURS MAXIMUM MARKS: 100Note:- Attempt FIVE questions in all, including Question No.8 which is compulsory. All questions carry equal marks.1. (a) Find a unit vector which is perpendicular to the vectors +j and j + ?. (5)(b) If A = xz - y2 j + 2x2y?? and =x2yz2, find (15)2. (a) Define angular momentum of a single particle and derive a relation between torque and angular momentum. (10)(b) Calculate the angular momentum, about the Earth's center of a 50 kg person on the equator of the rotating earth. (10)3. Describe with the help of necessary diagrams the details of Michelson-Morley experiment. What was the conclusion drawn from the results of the experiment. (20)4. (a) Write down Maxwell's distribution function for molecular speeds in a gas. Give the details of various parameters involved. (10)(b) A container filled with N molecules of Oxygen gas is maintained at 300 K. What fraction of the molecules has speeds in the range 599-601 m/see? The molar mass M of Oxygen is 0.032 kg/mole. (10)5. Differentiate between Phase and Group velocities. Given that phase velocity V of waves in deep water is (g l /2p ) 1/2 ,find their group velocity v. (20)6. What is interferometer? Describe the construction and working principle of an interferorneter with which you are familiar. (20)7. Write short n

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