Physics
Light from the star, Alpha Centauri, which is nearest to the earth after the sun, reaches the earth in

4.2 seconds
4.2 years
42 years
42 seconds

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Physics
The wall of a dam is broader at the base

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

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