Question

There is a spring balance whose one end is attached to a cage , in which of the following case weight measured by spring balaced will not be equal to  real one ,optn r

1)  a   bird is  sitting in an air tight cage

2)   a   bird is sitting in a cage whose gate is open

3)   a bird is flying in an air tight cage

4)      a bird is flying in a cage whose gate is open 

annex explnatn also

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