Physics
A metal-semiconductor junction diode is called ________

Photo diode
Schottky diode
P-N Juction diode
Tunnel diode

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Physics
We always see the same face of the moon, because

It revolves on its axis in adirection opposite to that ofthe earth
It takes equal time for revolution around the earth and rotation on its own axis
It rotates at the same speed as the earth around the sun
It is smaller than the earth

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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 ?

A will reach the ground first.
B 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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