1) 1.The device made of a wheel and a string used to lift objects is called.... a) A) Lever b) B) Pulley c) C) Inclined Plane d) D) Gear 2) 2. When a pulley is used, the effort required to lift the object becomes..... a) A) More b) B) Less c) C) The same d) D) Doubled 3) 3.The pulley changes the ...........of the applied force. a) A) Direction b) B) Magnitude c) C) Speed d) D) Length 4) 4. In this experiment, to lift the weight upward, the string is pulled....... a) A) Upward b) B) Downward c) C) Sideways d) D) Horizontally 5) 5. A common real-life example of a pulley is........ a) A) Fan blades b) B) Bicycle pedal c) C) Well wheel (rahat) d) D) Electric switch 6) 6. The main purpose of using a pulley is........ a) A) To increase the weight of an object b) B) To reduce the effort needed to lift a load c) C) To make the object heavier d) D) To stop the movement of a load 7) Which part of the pulley rotates when lifting the weight? a) A) The string b) B) The wheel (reel) c) C) The pencil d) D) The clay 8) 8. In the experiment, what prevents the reel (pulley wheel) from sliding back and forth? a) A) The adhesive tape b) B) The weight c) C) The clay on both sides d) D) The pencil 9) 9. When the free end of the string is released, what happens to the weight a) A) The weight goes up b) B) The weight comes down c) C) The weight remains still d) D) The reel breaks 10) 10. Which type of simple machine is a pulley? a) A) Lever b) B) Wedge c) C) Wheel and axle d) D) Inclined plane

JKC Std 6 . Experiment 14: The Function of a Pulley

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