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Friday 24th May 2019
 ICSE Guess > ICSE Papers > Important Questions > Class X > Physics > Physics By M. P. Keshari ICSE Physics Class X Important Papers By M. P. Keshari Force, Work, Energy and Power (Solved) Disable Pop up Blockers to View Solution Question .1. State Newton’s Second Law of motion both in words and in Equation form. Under what condition does this equation becomes F = ma ? Answer : Click Here Question .2. What is S I unit of force and how is it related to the CGS unit of force ? Answer : Click Here Question .3. Differentiate between mass and weight. Answer : Click Here   Question .4. Write the S I unit of mass and weight. Answer : Click Here Question .5. A force is applied on (i) a rigid body and (ii) non rigid body. How does the effect of force differ in the two cases ? Answer : Click Here Question .6. Define (i) Work (ii) Power and (iii) Energy. Answer : Click Here Question .7. Write the expression for the work done by constant force acting on a body, which gets displaced from its initial position in a direction different from the direction of force. Or, How can the work done be measured when force is applied at an angle to the direction of displacement ? Answer : Click Here Question .8. When a body moves in a circular path how much work is done ? Or, State the amount of work done by an object when it moves in a circular path for one complete rotation. Give reason to justify your answer. Answer : Click Here Question .9. How is work done related to the applied force ? Answer : Click Here Question .10. What should the angle between force and displacement be to get the (i) minimum work (ii) maximum work ? Answer : Click Here Question .11. Give an example when work done by force acting on a body is zero even though the body gets displaced from its initial position by the application of the force. Answer : Click Here Question .12. A truck driver starts off with his loaded truck. What are the major energy changes that take place in setting the truck in motion ? Answer : Click Here Question .13. State the energy change in an oscillating pendulum. Answer : Click Here Q.14. What is the main energy transformation that occurs in : (i) Photosynthesis in green leaves (ii) Charging of battery. Answer : Click Here Question .15. Which physical quantity does the electron volt measure ? How is it related to the SI unit of this quantity ? Answer : Click Here Question .16. By what factor does the kinetic energy of a moving body change when its speed is reduced to half ? Answer : Click Here Question .17. Show that for the free fall of a body, the sum of the mechanical energy at any point in its path is constant. Answer : Click Here Question .18. Define the terms (i) mechanical advantage (ii) velocity ratio (iii) efficiency of a machine. Write an expression to show the relationship between mechanical advantage, velocity ratioand efficiency for a simple machine. Answer : Click Here Question .19. What is the relationship between the mechanical advantage and velocity ratio of (i) An ideal machine and (ii) Practical machine ? Answer : Click Here Question .20. How do you distinguish between a lever of the first order from a second or a third order lever ? Answer : Click Here Question .21. The following are the examples of levers. State the class of lever to which each one belongs giving the relative position of load (L), Effort (E) and Fulcrum (F) (i) Scissors (ii) Sugar tongs (iii) Nut cracker and (iv) Pliers. Answer : Click Here Question .22. Fig below shows a weight less lever in equilibrium. Neglect friction at the fulcrum F. (i) State the principle of moments as applied to the above lever. (ii) Define mechanical advantage and calculate its value for the given lever. (iii) Name the type(s) of lever which has M.A.>1. Answer : Click Here Question .23. Which class of levers has a mechanical advantage always greater than one ? What change can be brought about in this lever to increase its mechanical advantage ? Answer : Click Here Question .24. Which class of levers has a mechanical advantage always less than one ? Explain briefly with a diagram why their mechanical advantage is less than one. Answer : Click Here Question .25. Why is the mechanical advantage of a lever of the third class always less than one ? Give one example of this class of lever. Answer : Click Here Question .26. To use a machine as a force multiplier, which class of lever should preferred ? Draw a sketch of such a lever. Or, Draw a labelled sketch of a class – II lever. Give one example of such a lever. Answer : Click Here Question .27. A pair of scissors and a pair of pliers belong to the same class of lever. (i) Which one has mechanical advantage less than one ? (ii) State the usefulness of such a machine whose mechanical advantage is less than one. Answer : Click Here . Question .28. Explain why scissors for cutting cloth may have blades much longer than the handles; but shears for cutting metals have short blades and long handles. Answer : Click Here Question .29. Give two reasons why the efficiency of a single movable pulley system is not 100%. Answer : Click Here Question .30. A combination of a movable pulley P1with a fixed pulley P2 is used for lifting up a load W. (i) State the function of the fixed pulley P2. (ii) If the free end of the string moves through a distance x, find the distance by which the load W is raised. Answer : Click Here Question .31. Name a type of single pulley that can act as a force multiplier. Draw a labelled diagram of the above named pulley. Answer : Click Here Question .32. A block and tackle pulley system has a velocity ratio 3. (i) Draw a labelled diagram of this system. In your diagram, indicate clearly the points of application and the directions of the load and effort. (ii) Why should the lower block of this pulley system be of negligible weight ? Answer : Click Here Q.33. Define an inclined plane. Answer : Click Here Paper By Mr. M. P. Keshari [ For Further Enquiry 09434150289]

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