Question

Which group has articles belonging to all the three classes of lever?

• A. P
• B. Q
• C. R
• D. S

Answer 1

The correct option is B Q

$\text{Solution}:$

A lever is a rigid, straight (or bent) bar which is capable of turning about a fixed axis. Fulcrum of a lever does not move and clockwise moment of load about fulcrum equals anticlockwise moment of effort about fulcrum.

1. The 1st Class Lever in which fulcrum is situated in between load and effort. For e.g., pair of scissors, see-saw etc

2. The 2nd Class Lever in which load is situated in between fulcrum and effort. For e.g., nut cracker, wheel blower.

3. The 3rd Class Lever in which effort is situated in between the fulcrum and the load. For e.g., fishing rod, pair of tongs, stapler etc.

$\text{Hence B is the correct option}$