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Which of the following is a compound machine?

a,a ramp

b, a wheel and axle

c, a pulley

d, a pair of scissors

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W0lf93
A compound machine uses more than one simple machine to work. The six classic examples of simple machines are: Lever, wheel/axle, pulley, inclined plane, wedge, and a screw.  
A ramp is an inclined plane. Therefore, the answer is D. a pair of scissors

Option (d) is correct. A pair of scissors is a compound machine.

Further Explanation:

A machine is a device that is used to reduce the human effort and obtain much more output as compared to the input given. A simple lever that is used to lift a load is also a machine as it reduces the human effort.

A simple machine is a machine that has only one machine. For example, a ramp is an inclined plane that helps to cover a height easily. A lever is also a simple machine that is used to multiply the effort to pick up the heavier loads.

A ramp, a wheel and axle and a pulley all are the simple machines. They have only one simple machine in them whereas a pair of scissors is not a simple machine as it has more than one machine in it.

Thus, Option (d) is correct. A pair of scissors is a compound machine.

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Answer Details:

Grade: Middle School

Chapter: Machines

Subject: Physics

Keywords: Simple machine, compound machine, ramp, wheel and axle, pair of scissors, human efforts, lever, inclined plane.

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