#### ALL Chapter 2 Marks

11th Standard

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Physics

Time : 01:30:00 Hrs
Total Marks : 88
Answer All The Following Question:
44 x 2 = 88
1. The measurement value of length of a simple pendulum is 20cm known with 2mm accuracy.  The time for 50 oscillations was measured to be 40 s within Is resolution. Calculate the percentage accuracy in the determination of acceleration due to gravity 'g' from the above measurement.

2. What is meant by Range of masses?

3. How Physics is related to technology and define technology with respect to Physics.

4. A RADAR signal is beamed towards a planet and its echo is received 7 minutes later. If the distance between the planet and the Earth is 6.3 x 1010m. Calculate the speed of the signal.

5. The following velocity-time graph represents a particle moving in the positive x-direction. Analyse its motion from 0 to 7 s. Calculate the displacement covered and distance travelled by the particle from 0 to 2 s.

6. Write the combined effect of two velocities of a projectile.

7. What are the examples of projectile motion?

8. A train 100 m long is moving with a speed of 60 km h-1. In how many seconds will it cross a bridge of 1 km long?

9. The momentum of a system of particles is always conserved. True or false?

10. Calculate the acceleration of the bicycle of mass 25 kg as shown in Figures

11. What is free body diagram? What are the steps to be followed for developing free body diagram.

12. Why are ball bearings used in machinery?

13. Give the unit and dimension of power.

14. Two bodies of identical masses with 2nd body at rest collides with 1st body, prove that the velocities of the bodies are reversed.

15. A force $\vec F=\vec i+2\vec j+3\vec k$ k acts on a particle and displaces it through a distance $\vec S=4\vec i+6\vec j$Calculate the work done if force and work done are in the same direction

16. A body of mass 10 kg at rest is subjected to a force of 16N. Find the kinetic energy at the end of 10 s.

17. Give an example to show that the following statement is false. 'any two forces acting on a body can be combined into single force that would have same effect'.

18. Three identical solid spheres move down through three inclined planes A, B and C all same dimensions. A is without friction, B is undergoing pure rolling and C is rolling with slipping. Compare the kinetic energies EA' EB and Ec at the bottom.

19. Two boys of the same weight sit at the opposite ends of a diameter of a rotating circular table. What happens to the speed of rotation if they move nearer to axis of rotation?

20. A child sits stationary at one end of a long trolley moving uniformly with speed V on a smooth horizontal floor. If the child gets up and runs about on the trolley in any manner, then what is the effect of the speed of the centre of mass of the (trolley + child) system?

21. Define weight.

22. If the ratio of the orbital distance of two planets ${d_1\over d_2}=2,$ what is the ratio of gravitational fi eld experienced by these two planets?

23. The escape velocity of a body from Earth's surface is ve' What will be the escape velocity of the same body from a height equal to 7R from Earth's surface.

24. At .what distance from the centre of Earth, the value acceleration due to gravity 'g' will be half that of the surface?

25. Distinguish between streamlined flow and turbulent flow.

26. We use straw to suck soft drinks, why?

27. For a given material, the youngs modulus is 2 - 4 times that of rigidity modulus. What is its poisson's ratio?

28. What is the nature of intermolecular forces?

29. Calculate the number of moles of air is in the inflated balloon at room temperature as shown in the figure.

The radius of the balloon is 10 cm, and pressure inside the balloon is 180 kPa.

30. Is it possible that there is a change in temperature of a body without giving/taking heat to from it?

31. Calorimeters are made of metals not glass. Why?

32. Why moon has no atmosphere?

33. A fresh air is composed of nitrogen N2(78%) and oxygen O2(21%). Find the rms speed of N2 and O2 at 20°C.

34. What type of motion is associated with the molecule of a gas?

35. The molecules of a given mass of a gas have rms velocity of 200 ms-1 at 27°C and 1.0 x 105 Nm-2 pressure. When the temperature and pressure of the gas are respectively. 127°C and 0.05 x 105 Nm-2

36. Write down the time period of simple pendulum.

37. Define forced oscillation. Give an example.

38. Define molar specific heat capacity.

39. A spring stretches by 0.020 m when a 1.5 kg object is suspended from its end. How much mass should be attached to the spring so that its frequency of vibration is f= 3.1 Hz?

40. Consider the following function
(a) y = x2 + 2 $\alpha$ t x
(b) y = (x + vt)2
which among the above function can be characterized as a wave ?.

41. In an empty room why is it that a tone sounds louder than in the room having things like furniture etc.

42. What is the effect of pressure on velocity of sound in gas?

43. Write the relation between path difference and phase difference?