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Fulcrum is the ______ of a leverfixed part ✔️moving partcan’t sayLever consists of ______ partstwothree ✔️fournone of theseLever helps in ________.moving the objectslifting the objectsall of the above ✔️Nail cutter is a ______________________class lever..first ✔️secondthirdLemon squeezer is a _______ class lever.firstsecond ✔️thirdScissors is a _________ class lever.first ✔️secondthirdStapler is a ______class lever.firstsecondthird ✔️Stair case is a / an ________________.leverinclined plane ✔️wheel and axlenone of theseIn case of third class lever, the sequence is:effort, load, fulcrumfulcrum, load, effortfulcrum, effort, load ✔️load, fulcrum, effortIn case of second class lever, the sequence is:fulcrum, load, effort ✔️fulcrum, effort, loadload, fulcrum, effortIn case of first class lever, the sequence is:fulcrum, load, effortfulcrum, effort, loadload, fulcrum, effort ✔️Mechanical advantage is _______________.load / effort ✔️effort / loadload + effortEfficiency of a simple machine is ______.effort applied on the machine / work done by the machinework done by the machine / effort applied on the machine ✔️none of these.Bottle openers is a __________________ lever.first classsecond class ✔️third classFor second class lever mechanical advantage is ____.always less than 1always greater than 1 ✔️always equal to 1Sewing machine is a ___machine.simplecomplex ✔️none of these.Quiz on Simple MachinesNow, it is time for your quiz session:128Created on November 02, 2020 By tanusri.kar.senMCQ ON SIMPLE MACHINES FOR CLASS FIVEThe multiple-choice questions mentioned here are the basic questions from the chapter- “the simple machines” which will help the students of classes five and six.You read the text first and then you appear for the quiz.OverviewSimple machines are mechanical devices that perform a greater amount of work by using a single applied force. Moving parts may or may not be there.In this case, we ignore friction losses. Work done by the applied force is equal to the work done on the load.Lever- example of simple machinesA lever is a rigid rod. We use it to lift the weight. It moves freely around a fixed point. It consists of three parts- load, fulcrum, and effort.Archimedes, a Greek scientist first discovered the laws of the lever. He discovered that a heavy load could be lifted easily using a lever.FulcrumFulcrum is a fixed part of a lever.It is a balance point on which the rod moves.LoadLoad is an object which is to be lifted or moved.EffortThe downward force that is applied on one end of the rod to move or lift the rod.Lever helps us in moving or lifting heavy objects. For this, we have to apply a small force.Depending on the position of the fulcrum, the load, and the effort, levers are classified into three types- first class, second class, and third class.First class leverIn case of first class levers, the fulcrum is situated in between the effort and the load.Examples:Nail cuttersSee sawScissorsPliersTrolleySecond class leverIn second class levers, the load is in between the effort and fulcrum.Example:NutcrackerLemon SqueezerWheel-barrowsBottle openersThird class leverIn third class lever, the effort is in between the fulcrum and the load.Examples:StaplerFishing rodsIce tongsInclined Plane- a simple machineAn inclined plane is a sloping surface which is used to lift the things up. It requires less effort in lifting the things.ExampleStaircase, NeedleWedge- a simple machineThe device by which we can change the direction of the input force is known as Wedge.The wedges are moving inclined planes which are driven under loads.Wheel and Axle- a simple machineThe wheels were invented about 5000 years ago. They were made from solid planks of wood and were very heavy.Wheel and axle is a simple machine.It consists of a large wheel.This wheel is attached to a rod.The rod is called an axle.The wheel rotates in a circle around a center point. This is called a fulcrum.Example- Tyres in a car, bus, truck; pencil sharpener, doorknobs, giant wheel, etc.Pulley- a simple machineA simple machinePulley- a simple machineIt is a grooved wheel.It consists of a rope, chain, or belt running around it.A fixed rod is there around which the wheel rotates. This rod is called an axle.The axle passes through the center of the wheel.Two main types of pulleys are fixed pulley and movable pulley.It is also known as sheave or drum.Fixed pulleyHere, the pulley is fixed to a wall or to a hook.It changes the direction of the force but does not change the amount of force applied to it.Examples: Wells and flag poles.Movable PulleyIn