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Subject :NSO    Class : Class 3

Select the activity which will produce a different effect than the other three.

AFitting wheels on the bottom of a box to be dragged.
BPutting oil on the hinges of a garage gate.
CTiling a cemented floor.
DReplacing the laminated plastic board with cardboard for toy car racing.


It is do with friction. Option D increases the friction while all other decrease the friction

Ans 1:

Class : Class 7

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