# Waves, Energy, Machines and Power

1. Which simple machines depend on the principle of moments for them to work? (Clockwise moments=anticlockwise moments)

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2. Which of the following is not a type of wave energy?

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3. Which form of energy flows from one region to another due to temperature difference?

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4. A body due its relative position or state possess which form of energy?

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5. Energy spent is the product of force and distance i.e. F x D

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6. The ratio of Load to effort is?

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7. The velocity ratio V.R of a block and tackle pulley system is equal to no. of strings supporting the Load?

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8. The velocity ratio V.R of a hydraulic machine is equal to R squared/ r squared

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9. Mention 2 types of mechanical energy

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10. Give the velocity ratio V.R of a single fixed pulley?

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11. What is POWER?

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12. Name the form of energy which is contained in substances and be converted to heat by the process of oxidation (burning)

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13. How is the V.R of Gears calculated?

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14. How is the velocity ratio of a screw machine calculated?

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15. State the Law of conversation of energy?

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16. Which of the following is not a non-renewable energy resource?

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17. Is the following formula correct 1Nm = 1 joule (J)?

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18. The distance between 2 successive threads in a screw is called?

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19. What is the formula of gravitational potential energy P.E?

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20. Which among the following is not a type of pulley?

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21. The law of conservation of energy states also that the sum of kinetic energy and potential energy of a system is constant.

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22. A compressed string or compressed air in an air bottle possess which form of energy?

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23. Efficiency is the ratio of work done by the load to the work done on the effort?

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24. Which of the following statement is CORRECT about efficiency?

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25. Which of the following is a class of levers?

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26. What is the name of the force applied to the machine?

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27. What is the name of the force exerted by the machine?

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28. What is the formula of elastic potential energy?

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29. For a pendulum bob, the position of its maximum kinetic energy has zero potential energy and the position of its maximum potential energy has zero kinetic energy?

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30. Mention any form of energy

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31. Which of the following is the ODD one out?

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32. Give the velocity ratio V.R of a single movable pulley?

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33. What is the SI UNIT of POWER?

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34. Running water, a speeding bullet, wind or a moving car possess which form of energy?

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35. Which type of energy which can be recycled or reused over and over again and it cannot be exhausted?

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36. POWER = work done/time taken

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37. Give the velocity ratio V.R of a block and tackle pulley?

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38. A body in motion possess which form of energy?

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39. Which of the following statement is CORRECT about work?

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40. Which among the following is not among a SIMPLE MACHINE?

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41. Which form of energy is produced by vibrating objects or particles i.e. when a wave is plucked?

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42. Which of the following is not a source of energy?

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43. The ratio of distance moved by effort to the distance moved by the load is?

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44. What is the name of the device that enables work to be done more easily or conveniently?

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45. Which type of energy is exhaustible and once its material is used it cannot be retrieved?

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