1(vii)
Which of the following is a class III lever?
- (a)Pair of scissors
- (b)Wheelbarrow
- (c)Crowbar
- (d)Human forearm
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Human forearm
Reason — Human forearm is a class III lever because like class III lever, the elbow joint acts as fulcrum at one end, biceps exerts the effort in the middle and load on the palm is at the other end. Thus, this is an example of class III lever.