CBSE Physics sample paper9 Class XI 2009

http://www.cbseguess.com/-------------------------------------------------------------------------------------------------------www.cbseguess.com Other Educational Portals www.icseguess.com | www.ignouguess.com | www.dulife.com | www.magicsense.com Sample Paper – 2009 Class – XI Subject – Physics Max. marks-40 Time-1. 30 hrs Answer all the questions 1. Can a physical quantity have units but still be dimensionless? 2. Is it possible to exert a force which does a work with out changing its kinetic energy? If so, give an example. 3. What will be the moment of inertia of a hollow sphere whose radius is 0.5 m and mass is 2kg? 4. The linear speed of a planet is not constant its orbit. Comment. 5. Can we get off a frictionless horizontal surface by jumping? 6. A new unit of length is chosen such that the speed of light in vacuum is unity. What is the distance between the sun and the earth in terms of the new unit, if light takes 8min and 20 sec. to cover the distance? 7. Draw position-time graph for two objects having zero relative velocity. 8. Obtain an expression for the acceleration of a body rolling in an inclined plane. 9. A Saturn year is 29.5 times the earth year. How far is the Saturn from the sun if the earth is 1.5 x 108 Km away from the sun? 10. Two springs A and B are identical but A is harder than B (KA > KB ). On which spring more work will be done if : (a) they are stretched the same distance, (b) they are stretched by same force? 11. Is the acceleration due to gravity varying? Deduce an expression for the acceleration due to gravity at a height from the surface of earth. 12. State and prove perpendicular axis and parallel axis theorem. 13. Define potential energy. Derive an expression for the potential energy. 14. Two bodies of masses 10kg and 20kg respectively kept on a smooth horizontal surface are tied to the ends of a light string. A horizontal force F=600N is applied to (i) A and (ii) B along the direction of string. What is the tension in the string in each case? 15. Deduce a relation between the physical quantities time ‘T’, length ‘L’ and acceleration due to gravity ‘g’ by dimensional analysis. 16. What do you mean by Elastic collision? Obtain an equation for the final velocities after collision of two bodies with velocities V1i and rest. 17. Derive an equation for the maximum velocity with which a vehicle can move in a banked track. Paper Submitted by: Subrat Ranjan Pathi Email subrat_2king@yahoo.co.in Phone No. 09438154806