Multiple Choice Unit Review PDF

Multiple-Choice 4. The effort arm is longer than the Questions load arm in a lever. What type of Section 1: Simple Machines mechanical advantage does it...

Multiple-Choice 4. The effort arm is longer than the Questions load arm in a lever. What type of Section 1: Simple Machines mechanical advantage does it provide? 1. Which of the following is a simple ○ A) Speed advantage machine? ○ B) Force advantage ○ A) Bicycle ○ C) No advantage ○ B) Screw ○ D) Load advantage ○ C) Engine ○ D) Gear train 5. In a class 2 lever, where is the load positioned? 2. This fixed pulley provides which type ○ A) Between the effort and of advantage? fulcrum ○ B) At the end, farthest from the fulcrum ○ C) At the fulcrum ○ D) Between the effort and resistance Section 2: Mechanical Advantage 6. Mechanical advantage (MA) is defined as: ○ A) Force advantage ○ A) Effort force divided by load ○ B) Speed advantage force ○ C) Direction advantage ○ B) Load force divided by ○ D) No advantage effort force ○ C) The ratio of output work to input work ○ D) The distance ratio of effort 3. Which simple machine is used in a and load arms ramp? 7. Calculate the mechanical advantage ○ A) Lever of a machine that uses 10 N of effort ○ B) Pulley force to lift a 50 N load. ○ C) Inclined plane ○ A) 0.2 ○ D) Screw ○ B) 2 ○ C) 5 ○ D) 10 8. This pulley system with four Section 3: Gears supporting ropes (pull rope is not supporting) has a theoretical 11. What is the purpose of an idler gear mechanical advantage of: in a gear train? ○ A) Increase speed ○ B) Reverse direction ○ C) Increase mechanical advantage ○ D) Decrease force 12. A gear ratio greater than 1 indicates: ○ A) Speed advantage ○ B) Force advantage ○ C) No advantage ○ D) Equal speed and force ○ A) 1 ○ B) 2 ○ C) 3 13. Reducing gears are most useful in: ○ D) 4 ○ A) Sports cars ○ B) Uphill hauling ○ C) Bicycles 9. A lever with a 2-meter effort arm and ○ D) Watches a 0.5-meter load arm has a theoretical mechanical advantage of: ○ A) 0.25 14. Which gear type has no effect on ○ B) 2 speed or force? ○ C) 4 ○ A) Multiplying gears ○ D) 8 ○ B) Reducing gears ○ C) Parallel gears ○ D) Idler gears 10. What happens to the effort force required as mechanical advantage increases? 15. A gear train has 20 teeth on the ○ A) It decreases driver gear and 40 teeth on the ○ B) It increases follower gear. What is the gear ratio? ○ C) It remains the same ○ A) 0.5 ○ D) It fluctuates ○ B) 1 ○ C) 2 ○ D) 4  Section 4: Efficiency 20. A machine with high efficiency: ○ A) Wastes more energy 16. Efficiency is the ratio of: ○ B) Converts most input ○ A) Work output to work input energy into useful output ○ B) Load force to effort force ○ C) Reduces work output ○ C) Energy used to energy ○ D) Requires more effort wasted ○ D) Speed advantage to force Section 5: Hydraulics and Pneumatics advantage 21. Pascal’s Law states that pressure applied to a fluid: ○ A) Increases with altitude 17. A ramp has a work input of 200 J ○ B) Decreases in an open and a work output of 150 J. What is system its efficiency? ○ C) Is transmitted equally in ○ A) 50% all directions ○ B) 75% ○ D) Depends on the shape of ○ C) 100% the container ○ D) 150% 22. Which of the following uses a 18. What is the primary cause of hydraulic system? inefficiency in mechanical systems? ○ A) Air compressor ○ A) Friction ○ B) Car brakes ○ B) Weight ○ C) Bicycle pump ○ C) Load distance ○ D) Inflatable raft ○ D) Effort force 23. What type of fluid is used in a 19. Adding lubricants to moving parts pneumatic system? will: ○ A) Liquid ○ A) Decrease efficiency ○ B) Gas ○ B) Increase efficiency ○ C) Plasma ○ C) Have no effect ○ D) Solid ○ D) Increase friction  29. Kinetic energy is energy: ○ A) In motion 24. Increasing the area of the output ○ B) Stored piston in a hydraulic lift: ○ C) Released as heat ○ A) Decreases the output ○ D) From chemical reactions force ○ B) Increases the output force ○ C) Has no effect on force ○ D) Increases pressure 30. The law of conservation of energy 25. What is the unit of pressure? states that energy: ○ A) Newton (N) ○ A) Cannot be created or ○ B) Pascal (Pa) destroyed ○ C) Joule (J) ○ B) Is always lost as heat ○ D) Meter (m) ○ C) Only exists in two forms ○ D) Depends on friction Section 7: Energy Transformations Section 6: Work and Energy 31. A flashlight converts chemical 26. Work is defined as: energy into: ○ A) Force applied over a ○ A) Mechanical energy distance ○ B) Light and heat energy ○ B) Energy stored in an object ○ C) Sound energy ○ C) Energy in motion ○ D) Gravitational energy ○ D) The change in velocity of an object 32. Which of the following is an example of potential energy? 27. The formula for work is: ○ A) A moving car ○ A) W = F / d ○ B) A compressed spring ○ B) W = F × d ○ C) A burning candle ○ C) W = d / F ○ D) Flowing water ○ D) W = F − d 33. At the highest point of a pendulum 28. A 50 N force moves a box 3 meters. swing, the energy is mostly: How much work is done? ○ A) Kinetic ○ A) 150 J ○ B) Potential ○ B) 53 J ○ C) Thermal ○ C) 47 J ○ D) Electrical ○ D) 100 J 34. What happens to the potential 39. Calculate the work done to lift a 10N energy of a ball as it falls? object 5m in height. ○ A) It increases ○ A) 40 J ○ B) It decreases ○ B) 20 J ○ C) It remains constant ○ C) 50 J ○ D) It converts to kinetic ○ D) 60 J energy 40. Which energy conversion occurs 35. Which form of energy is produced by when water flows through a friction? hydroelectric dam? ○ A) Kinetic ○ A) Mechanical to chemical ○ B) Thermal energy ○ C) Chemical ○ B) Potential to electrical ○ D) Gravitational energy ○ C) Kinetic to thermal energy ○ D) Electrical to sound energy 36. Which energy source powers a hydraulic press? ○ A) Potential energy of a liquid ○ B) Gravitational energy ○ C) Pressure energy ○ D) Elastic energy 37. A lever with an effort arm of 4m and a load arm of 1m has a TMA of: ○ A) 4 ○ B) 2 ○ C) 3 ○ D) 5 38. Which of the following objects converts electrical energy to light energy? ○ A) A battery ○ B) A light bulb ○ C) A fan ○ D) A pulley ANSWER KEY 26. A) Force applied over a distance 27. B) W = F × d Section 1: Simple Machines 28. A) 150 J 29. A) In motion 1. B) Screw 30. A) Cannot be created or 2. C) Direction advantage destroyed 3. C) Inclined plane 4. B) Force advantage Section 7: Energy Transformations 5. A) Between the effort and fulcrum 31. B) Light and heat energy Section 2: Mechanical Advantage 32. B) A compressed spring 33. B) Potential 6. B) Load force divided by effort 34. B) & D) Potential energy force decreases as it is converted to 7. C) 5 kinetic energy 8. D) 4 35. B) Thermal 9. C) 4 36. C) Pressure energy 10. A) It decreases 37. A) 4 38. B) A light bulb Section 3: Gears 39. C) 50 J 11. B) Reverse direction 40. B) Potential to electrical energy 12. B) Force advantage 13. B) Uphill hauling 14. D) Idler gears 15. C) 2 Section 4: Efficiency 16. A) Work output to work input 17. B) 75% 18. A) Friction 19. B) Increase efficiency 20. B) Converts most input energy into useful output Section 5: Hydraulics and Pneumatics 21. C) Is transmitted equally in all directions 22. B) Car brakes 23. B) Gas 24. B) Increases the output force 25. B) Pascal (Pa) Section 6: Work and Energy