Physics
The ordinary and maximum tolerance limit of sound by human being is

60 db to 80 db (decibel)
65 db to 75 db (decibel)
70 db to 85 db (decibel)
50 db to 70 db (decibel)

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

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Physics
What is the direction of torque?

Opposite to the direction of applied force
Perpendicular to the direction of applied force
Parallel to the radius
Same as the direction of applied force

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Physics
Which is evidence that supports the dynamo theory?

Granite and basalt conduct electricity
Earth's core contains a large amount of iron
Earth's outer core contains liquid that conducts electricity
Convection occurs in Earth's inner core

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