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Subject :NSO    Class : Class 4

Which of these statements is INCORRECT?

ACranes used to lift loads use pulleys.
BA wedge is made up of two inclined planes.
CFork is an example of lever.
DScrew is used to lower and raise things.


HOW ARE SCREWS USED FOR RAISING AND LOWERING

Ans 1:

Class : Class 5
Screw is used to fasten things and not really used to lower and raise things.. Isnt D incorrect too?

Ans 2:

Class : Class 5

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