Physics
A bucket of water is hung from a spring balance. A piece of iron is suspended in the water without touching the sides or touching the bottom of the bucket. The reading of the spring balance

Will increase
Varies with the increase of depth of the immersion of the iron piece
Does not change
Will decrease

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Physics
When a pail of water is swung in a vertical circle, the water does not fall out at the top of the loop when the speed is

Below a certain minimum value irrespective of amount of water in the pail
Below a certain minimum value depending on amount of water in the pail
Above a certain minimum value irrespective of amount of water in the pail
Above a certain minimum value depending on amount of water in the pail

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