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

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

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Physics
Why does bleeding occur through the nose in high mountainous regions ?

The pressure at high altitudes is greater than that on the plains
The blood pressure fluctuates and finally decreases drastically
The blood pressure of a person increases at high altitudes
The pressure of blood in capillaries is greater than the outside pressure

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

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