Physics
Suitable impurities are added to a semiconductor depending on its use. This is done in order to

increase its electrical resistivity
increase its electrical conductivity
increase its life
enable it to withstand higher voltages

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Physics
A man standing at the top of a tower has two spheres A and B. He drops sphere A downwards and throws sphere B horizontally at the same time. Which of the following is correct ?

B will reach the ground first.
A will reach the ground first.
The question is incomplete because the masses of the spheres are not given.
Both the spheres will reach the ground simultaneously.

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