Physics
Let a thin capillary tube be replaced with another tube of insufficient length then, we find water

depressed
change its meniscus
will overflow
will not rise

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Physics
To prevent damage from lightning, lightning conductors are used on tall structures. The lightning conductor

Should be made of a good conductor but can be of any shape
Should be in the form of a vertical rod
Can be of any shape
Should be made of a good conductor like copper with sharp-pointed edges

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Physics
The wall of a dam is broader at the base

Because streamlining is required
To withstand pressure that increases with depth
To withstand pressure that is increased with atmospheric pressure
To withstand pressure that increases in a horizontal plane

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