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Question

The grooves along a screw act as _________.
  1. wedges
  2. inclined planes
  3. pulleys
  4. wheels


Solution

The correct option is B inclined planes
The grooves of a screw is essentially a rotating and winding inclined plane. Screws are used to fasten two pieces of metal or wood together. Since a screw is a winding inclined plane which is wrapped spirally around a cylinder, it can not be pulled out easily from the fastened pieces, as is not the case with a nail.

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