Class 11 final paper 2013

               "Om Sai Ram"

  Er.Shyam Pachori Classes

 PHYSICS(Theory)

CLASS:XI

Time:3Hrs                                                                                                                        M.M :70

 General Instruction:

1. All questions are compulsory.

2. There are 30 questions in total. Question 1 and 8 carry 1 marks each. Question 9 to 18 carry 2 marks each. Question 19 to 26 carry 3 marks each and question 27 to 30 carry 5 marks each.

3.There is no overall choice in paper , however some internal choices are mentioned in the paper.

 1. Mercury do not wet the glass surface , why?

 2. Why the lever of wrench is always of large length ?

3. Write the number of significant figures in (a) 9.11 × 10³¹ kg  (b) 0.000486 g/cm³

4. What is the time period of simple pendulum inside a freely falling elevator ?

5. One kg sugar weigh more on Equator or Pole explain why?

6. Why deep water runs slower?

7 What is the S.I unit and dimensional formula for Universal Gravitational constant(G) ?

8. What will be the effect on the duration of a day on earth, if the earth suddenly expand?

9. At what height above the earth surface acceleration due to gravity becomes half ?(Take R=6400 km)

10. Newton’s Second  law of motion is the real law of motion , Explain.

11.Draw a graph showing static , limiting and kinetic friction ?

12. Define Light year and Astronomical unit with its numerical values.

13. Define power with its SI unit.

14. Two bodies A and B having masses 5 kg and 6 kg respectively, have there equal kinetic energy. Find ratio of  their momentum.

15. Explain Surface tension , with its one example.

16. The pressure P=F/A, where F =100 ± 5 pascal and A =10 ± 0.2 m².Find the percentage error in P.

17.Prove that Steel is more elastic than Rubber..

18. A machine has a mass of 40kg. It fires 35gm bullets at the rate of 6 bullets per second , with the speed of 400 m sec^-1.what force must be applied to the gun to keep it in position ?

19. Derive the expression for Mayer’s Formula.

20. Derive the equation by calculus method

           V²-u²=2as

     Where symbol has their usual meanings

21.State and prove theorm of perpendicular axis.

OR

Derive the relation between  torque and moment of inertia.

22.State and prove work  energy theorm.

23. Define orbital velocity and obtained its expression ?

24. Define terminal velocity and derive its expression.

25. What do you mean by banking of road and derive the expression for the optimum velocity.

26.Define the expression for time period of a simple pendulum.

OR

(a)State and prove triangles law of vectors addition.

(b)The v – t graph for two bodies in motion is as shown. Which body has more acceleration.

                             
  

                                          

27. Having seen a big stone falling from the top of a tower Ravi pulled his friend Kiran away. The stone hit Ravi slightly and he got hurt. But he was saved from a major accident. (a)What made Ravi act in such a way. (b)From the top of a tower 100 m in height, a ball is dropped and at the same time another ball is projected vertically upwards from the ground with a velocity of 25 m/s.Find when and where the two balls meet. Take g = 9.8 m/sec².(Value Based Question)

28. Define SHM with its characteristic properties.

OR

Derive the expression of height of liquid in a capillary tube.

29. Explain the construction and working  of a refrigerator and derive the relation for its performance.

30.(1)State and prove Bernoulli’s theorem.

      (2) Explain Magnus effect.

                                                                        OR

Derive the expression of work done  in an adiabatic  process.

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