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

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

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Physics
Why does the sea appear blue in colour?

Refraction of the sun light
Reflection of the sun light from water surface
Scattering of the sunlight by water molecules
Interference of the sun light from water surface

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