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Subject :NSO    Class : Class 4

Which of the following statements is incorrect?

AA wedge is made up of two inclined planes.
BA fork is considered a screw.
CDoor knob is an example of wheel and axle.
DScrews are used to lower and raise things.

d is the correct answer please check if the answer is wrong

Ans 1:

Class : Class 5
Seems like b but giving c how?

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