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Subject :NSO    Class : Class 5

Refer to the given figure indicating three types of forces, X, Y and Z and select the incorrect option.

AAn astronaut floats in space due to absence of force Z.
BWhen we use pulley to lift a bucket of water from well (pulling vertically downward) then pulley makes X in opposite direction of Z making it easier to lift the bucket.
CForce Y is responsible for wearing and tearing of tyres of vehicles.
DWe can walk only on those surfaces which offer no Y.

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