Physics
A capillary tube is partially dipped vertically in a vessel containing water. Due to capillarity water rises in the tube. The height of water rise in the tube can be increased by

Increasing the radius of the capillary tube
Decreasing the radius of the capillary tube
None of these
Increasing the height of water in the vessel

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Physics
A hydrogen balloon floats up because of

Weight of the balloon is less than the weight of air displaced by it.
Air pressure decreases with decrease in height
Air pressure decreases with decrease in weight
The pressure inside the balloon is more than the pressure outside it

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