A) P and Q
B) Q and R
C) P and R
D) R and S
Correct Answer: B
Solution :
First class levers are those levers in which the fulcrum (a support or pivot point around which a lever turns) is located between the load (object on which work is to be performed) and the effort (the force that needs to be applied on the rod). See-saw, scissors and pliers are the examples of first class levers.
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