Question

A heavy block from the ground can easily be lifted up to a higher floor of a building using:

• A. Screw
• B. Pulley
• C. Inclined plane
• D. Wedge

Answer 1

The correct option is B Pulley

From the above diagram it is clear that, by installing a pulley at the top of the building, a worker can lift the heavy steel cupboard with lesser effort. By changing the direction of application of force, i.e. the effort, one can easily lift a heavy load. Hence, pulley is the right choice.