Question

Which of the following is a compound machine?
A) Screw
B) Knife
C) Bicycle
D) Ramp

Answer 1

Screw may be is the answer.

Answer 2

correct option is (c) Bicycle

A) Screw - An inclined plane wrapped around a cylinder or cone.  A common use of the screw is to hold objects together

B) Knife : Knife is an example of WEDGE , Wide at one end and pointed at the other.  Helps cut or split other objects.

C) Bicycle : Is an example of COMPOUND MACHINES . A compound machine is a combination of two or more simple machines.

D)Ramp: is an example of NCLINED PLANE . A flat surface that is raised so one end is higher than the other.  Makes it easier to move heavy objects up or down.