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Question Bank Machines 1. (a) What is a simple machine? (b) State three functions of a machine. or What is the purpose of a machine? Ans.(a) Machine : It is a device, by which we can overcome resistance, or gain speed by applying comparatively small force, at a convenient point, and in a desired direction. (b) (i) A machine multiplies effort, i.e., it lifts more load for small effort. (ii) A machine multiplies speed, i.e., effort acts through smaller distance and load moves through larger distance. (iii) A machine changes the direction of the applied effort. 2. (a) Name six simple machines. (b) Give one practical example of each machine named in (a). Ans. (a) (i) Lever, (ii) Pulley, (iii) Wheel and axle, (iv) Inclined plane, (v) Wedge, (vi) Screw (b) (i) Lever : The handle of a waterpump helps in multiplying effort. (ii) Pulley : A single movable pulley is used for changing the direction of the effort. Class-X 1 Questions Bank
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