Which of the following machines utilize a wheel and axle?

Screw

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Scissors

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Ferris wheel

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Door knob

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Solution

The correct option is D
Door knob

The wheel and axle is a machine in which the wheel is attached to the shaft (axle). It consists of either a wheel attached to an axle or two wheels of different diameters attached together. Doorknob and ferris wheel are examples of machines utilizing wheel and axle

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Wheel and axle can be found in which of the following devices ?

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